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<div id=Content><div class="CFile"><div class=CTopic id=MainTopic><h1 class=CTitle><a name="gd.h"></a>gd.h</h1><div class=CBody><!--START_ND_SUMMARY--><div class=Summary><div class=STitle>Summary</div><div class=SBorder><table border=0 cellspacing=0 cellpadding=0 class=STable><tr class="SMain"><td class=SEntry><a href="#gd.h" >gd.h</a></td><td class=SDescription></td></tr><tr class="SGroup"><td class=SEntry><a href="#Color_Decomposition" >Color Decomposition</a></td><td class=SDescription></td></tr><tr class="SMacro SIndent1 SMarked"><td class=SEntry><a href="#gdTrueColorGetAlpha" >gdTrueColorGetAlpha</a></td><td class=SDescription>Gets the alpha channel value</td></tr><tr class="SMacro SIndent1"><td class=SEntry><a href="#gdTrueColorGetRed" >gdTrueColorGetRed</a></td><td class=SDescription>Gets the red channel value</td></tr><tr class="SMacro SIndent1 SMarked"><td class=SEntry><a href="#gdTrueColorGetGreen" >gdTrueColorGetGreen</a></td><td class=SDescription>Gets the green channel value</td></tr><tr class="SMacro SIndent1"><td class=SEntry><a href="#gdTrueColorGetBlue" >gdTrueColorGetBlue</a></td><td class=SDescription>Gets the blue channel value</td></tr><tr class="SGroup"><td class=SEntry><a href="#Effects" >Effects</a></td><td class=SDescription>The layering effect</td></tr><tr class="SGroup"><td class=SEntry><a href="#Color_Quantization" >Color Quantization</a></td><td class=SDescription></td></tr><tr class="SEnumeration SIndent1 SMarked"><td class=SEntry><a href="#gdPaletteQuantizationMethod" >gdPaletteQuantizationMethod</a></td><td class=SDescription></td></tr><tr class="SGroup"><td class=SEntry><a href="#Transform" >Transform</a></td><td class=SDescription></td></tr><tr class="SConstant SIndent1 SMarked"><td class=SEntry><a href="#gdInterpolationMethod" >gdInterpolationMethod</a></td><td class=SDescription></td></tr><tr class="SGroup"><td class=SEntry><a href="#Types" >Types</a></td><td class=SDescription></td></tr><tr class="SType SIndent1 SMarked"><td class=SEntry><a href="#gdImage" >gdImage</a></td><td class=SDescription></td></tr><tr class="SType SIndent1"><td class=SEntry><a href="#gdImagePtr" >gdImagePtr</a></td><td class=SDescription>The data structure in which gd stores images. </td></tr><tr class="SGroup"><td class=SEntry><a href="#Types" >Types</a></td><td class=SDescription></td></tr><tr class="SType SIndent1 SMarked"><td class=SEntry><a href="#gdPointF" >gdPointF</a></td><td class=SDescription>Defines a point in a 2D coordinate system using floating point values. </td></tr><tr class="SType SIndent1"><td class=SEntry><a href="#gdPointFPtr" >gdPointFPtr</a></td><td class=SDescription>Pointer to a <a href="#gdPointF" class=LType id=link1 onMouseOver="ShowTip(event, 'tt1', 'link1')" onMouseOut="HideTip('tt1')">gdPointF</a></td></tr><tr class="SGroup"><td class=SEntry><a href="#Types" >Types</a></td><td class=SDescription></td></tr><tr class="SType SIndent1 SMarked"><td class=SEntry><a href="#gdFont" >gdFont</a></td><td class=SDescription></td></tr><tr class="SType SIndent1"><td class=SEntry><a href="#gdFontPtr" >gdFontPtr</a></td><td class=SDescription>A font structure, containing the bitmaps of all characters in a font. </td></tr><tr class="SGroup"><td class=SEntry><a href="#Colors" >Colors</a></td><td class=SDescription>Colors are always of type int which is supposed to be at least 32 bit large.</td></tr><tr class="SConstant SIndent1 SMarked"><td class=SEntry><a href="#Special_Colors" >Special Colors</a></td><td class=SDescription></td></tr><tr class="SGroup"><td class=SEntry><a href="#Types" >Types</a></td><td class=SDescription></td></tr><tr class="SType SIndent1 SMarked"><td class=SEntry><a href="#gdSource" >gdSource</a></td><td class=SDescription></td></tr><tr class="SType SIndent1"><td class=SEntry><a href="#gdSourcePtr" >gdSourcePtr</a></td><td class=SDescription><b>Note:</b> This interface is <b>obsolete</b> and kept only for *compatibility. </td></tr><tr class="SGroup"><td class=SEntry><a href="#Types" >Types</a></td><td class=SDescription></td></tr><tr class="SType SIndent1 SMarked"><td class=SEntry><a href="#gdFTStringExtra" >gdFTStringExtra</a></td><td class=SDescription></td></tr><tr class="SType SIndent1"><td class=SEntry><a href="#gdFTStringExtraPtr" >gdFTStringExtraPtr</a></td><td class=SDescription>A structure and associated pointer type used to pass additional parameters to the <a href="gdft-c.html#gdImageStringFTEx" class=LFunction id=link2 onMouseOver="ShowTip(event, 'tt2', 'link2')" onMouseOut="HideTip('tt2')">gdImageStringFTEx</a> function. </td></tr><tr class="SGroup"><td class=SEntry><a href="#Types" >Types</a></td><td class=SDescription></td></tr><tr class="SType SIndent1 SMarked"><td class=SEntry><a href="#gdPoint" >gdPoint</a></td><td class=SDescription></td></tr><tr class="SType SIndent1"><td class=SEntry><a href="#gdPointPtr" >gdPointPtr</a></td><td class=SDescription>Represents a point in the coordinate space of the image; used by <a href="gd-c.html#gdImagePolygon" class=LFunction id=link3 onMouseOver="ShowTip(event, 'tt3', 'link3')" onMouseOut="HideTip('tt3')">gdImagePolygon</a>, <a href="gd-c.html#gdImageOpenPolygon" class=LFunction id=link4 onMouseOver="ShowTip(event, 'tt4', 'link4')" onMouseOut="HideTip('tt4')">gdImageOpenPolygon</a> and <a href="gd-c.html#gdImageFilledPolygon" class=LFunction id=link5 onMouseOver="ShowTip(event, 'tt5', 'link5')" onMouseOut="HideTip('tt5')">gdImageFilledPolygon</a> for polygon drawing.</td></tr><tr class="SType SIndent1 SMarked"><td class=SEntry><a href="#gdRect" >gdRect</a></td><td class=SDescription>A rectangle in the coordinate space of the image</td></tr><tr class="SType SIndent1"><td class=SEntry><a href="#gdRectPtr" >gdRectPtr</a></td><td class=SDescription>A pointer to a <a href="#gdRect" class=LType id=link6 onMouseOver="ShowTip(event, 'tt6', 'link6')" onMouseOut="HideTip('tt6')">gdRect</a></td></tr><tr class="SGroup"><td class=SEntry><a href="#Color_Composition" >Color Composition</a></td><td class=SDescription></td></tr><tr class="SMacro SIndent1 SMarked"><td class=SEntry><a href="#gdTrueColorAlpha" >gdTrueColorAlpha</a></td><td class=SDescription>Compose a truecolor value from its components</td></tr><tr class="SGroup"><td class=SEntry><a href="#GifAnim" >GifAnim</a></td><td class=SDescription>Legal values for Disposal. </td></tr><tr class="SConstant SIndent1 SMarked"><td class=SEntry><a href="#gdImageGifAnim" >gdImageGifAnim</a></td><td class=SDescription></td></tr><tr class="SGroup"><td class=SEntry><a href="#Types" >Types</a></td><td class=SDescription></td></tr><tr class="SType SIndent1 SMarked"><td class=SEntry><a href="#gdSink" >gdSink</a></td><td class=SDescription></td></tr><tr class="SType SIndent1"><td class=SEntry><a href="#gdSinkPtr" >gdSinkPtr</a></td><td class=SDescription><b>Note:</b> This interface is <b>obsolete</b> and kept only for <b>compatibility</b>. </td></tr><tr class="SGroup"><td class=SEntry><a href="#Accessor_Macros" >Accessor Macros</a></td><td class=SDescription></td></tr><tr class="SMacro SIndent1 SMarked"><td class=SEntry><a href="#gdImageTrueColor" >gdImageTrueColor</a></td><td class=SDescription>Whether an image is a truecolor image.</td></tr><tr class="SMacro SIndent1"><td class=SEntry><a href="#gdImageSX" >gdImageSX</a></td><td class=SDescription>Gets the width (in pixels) of an image.</td></tr><tr class="SMacro SIndent1 SMarked"><td class=SEntry><a href="#gdImageSY" >gdImageSY</a></td><td class=SDescription>Gets the height (in pixels) of an image.</td></tr><tr class="SMacro SIndent1"><td class=SEntry><a href="#gdImageColorsTotal" >gdImageColorsTotal</a></td><td class=SDescription>Gets the number of colors in the palette.</td></tr><tr class="SMacro SIndent1 SMarked"><td class=SEntry><a href="#gdImageRed" >gdImageRed</a></td><td class=SDescription>Gets the red component value of a given color.</td></tr><tr class="SMacro SIndent1"><td class=SEntry><a href="#gdImageGreen" >gdImageGreen</a></td><td class=SDescription>Gets the green component value of a given color.</td></tr><tr class="SMacro SIndent1 SMarked"><td class=SEntry><a href="#gdImageBlue" >gdImageBlue</a></td><td class=SDescription>Gets the blue component value of a given color.</td></tr><tr class="SMacro SIndent1"><td class=SEntry><a href="#gdImageAlpha" >gdImageAlpha</a></td><td class=SDescription>Gets the alpha component value of a given color.</td></tr><tr class="SMacro SIndent1 SMarked"><td class=SEntry><a href="#gdImageGetTransparent" >gdImageGetTransparent</a></td><td class=SDescription>Gets the transparent color of the image.</td></tr><tr class="SMacro SIndent1"><td class=SEntry><a href="#gdImageGetInterlaced" >gdImageGetInterlaced</a></td><td class=SDescription>Whether an image is interlaced.</td></tr><tr class="SMacro SIndent1 SMarked"><td class=SEntry><a href="#gdImagePalettePixel" >gdImagePalettePixel</a></td><td class=SDescription>Gets the color of a pixel.</td></tr><tr class="SMacro SIndent1"><td class=SEntry><a href="#gdImageTrueColorPixel" >gdImageTrueColorPixel</a></td><td class=SDescription>Gets the color of a pixel.</td></tr><tr class="SMacro SIndent1 SMarked"><td class=SEntry><a href="#gdImageResolutionX" >gdImageResolutionX</a></td><td class=SDescription>Gets the horizontal resolution in DPI.</td></tr><tr class="SMacro SIndent1"><td class=SEntry><a href="#gdImageResolutionY" >gdImageResolutionY</a></td><td class=SDescription>Gets the vertical resolution in DPI.</td></tr><tr class="SGroup"><td class=SEntry><a href="#Crop" >Crop</a></td><td class=SDescription></td></tr><tr class="SConstant SIndent1 SMarked"><td class=SEntry><a href="#gdCropMode" >gdCropMode</a></td><td class=SDescription></td></tr><tr class="SGroup"><td class=SEntry><a href="#Image_Comparison" >Image Comparison</a></td><td class=SDescription></td></tr></table></div></div><!--END_ND_SUMMARY--></div></div></div>

<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="Color_Decomposition"></a>Color Decomposition</h3></div></div>

<div class="CMacro"><div class=CTopic><h3 class=CTitle><a name="gdTrueColorGetAlpha"></a>gdTrueColorGetAlpha</h3><div class=CBody><p>Gets the alpha channel value</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>c</td><td class=CDLDescription>The color</td></tr></table><h4 class=CHeading>See also</h4><ul><li><a href="#gdTrueColorAlpha" class=LMacro id=link7 onMouseOver="ShowTip(event, 'tt7', 'link7')" onMouseOut="HideTip('tt7')">gdTrueColorAlpha</a></li></ul></div></div></div>

<div class="CMacro"><div class=CTopic><h3 class=CTitle><a name="gdTrueColorGetRed"></a>gdTrueColorGetRed</h3><div class=CBody><p>Gets the red channel value</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>c</td><td class=CDLDescription>The color</td></tr></table><h4 class=CHeading>See also</h4><ul><li><a href="#gdTrueColorAlpha" class=LMacro id=link8 onMouseOver="ShowTip(event, 'tt7', 'link8')" onMouseOut="HideTip('tt7')">gdTrueColorAlpha</a></li></ul></div></div></div>

<div class="CMacro"><div class=CTopic><h3 class=CTitle><a name="gdTrueColorGetGreen"></a>gdTrueColorGetGreen</h3><div class=CBody><p>Gets the green channel value</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>c</td><td class=CDLDescription>The color</td></tr></table><h4 class=CHeading>See also</h4><ul><li><a href="#gdTrueColorAlpha" class=LMacro id=link9 onMouseOver="ShowTip(event, 'tt7', 'link9')" onMouseOut="HideTip('tt7')">gdTrueColorAlpha</a></li></ul></div></div></div>

<div class="CMacro"><div class=CTopic><h3 class=CTitle><a name="gdTrueColorGetBlue"></a>gdTrueColorGetBlue</h3><div class=CBody><p>Gets the blue channel value</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>c</td><td class=CDLDescription>The color</td></tr></table><h4 class=CHeading>See also</h4><ul><li><a href="#gdTrueColorAlpha" class=LMacro id=link10 onMouseOver="ShowTip(event, 'tt7', 'link10')" onMouseOut="HideTip('tt7')">gdTrueColorAlpha</a></li></ul></div></div></div>

<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="Effects"></a>Effects</h3><div class=CBody><p>The layering effect</p><p>When pixels are drawn the new colors are &ldquo;mixed&rdquo; with the background depending on the effect.</p><p>Note that the effect does not apply to palette images, where pixels are always replaced.</p><h4 class=CHeading>Modes</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>gdEffectReplace</td><td class=CDLDescription>replace pixels</td></tr><tr><td class=CDLEntry>gdEffectAlphaBlend</td><td class=CDLDescription>blend pixels, see <a href="gd-c.html#gdAlphaBlend" class=LFunction id=link11 onMouseOver="ShowTip(event, 'tt8', 'link11')" onMouseOut="HideTip('tt8')">gdAlphaBlend</a></td></tr><tr><td class=CDLEntry>gdEffectNormal</td><td class=CDLDescription>default mode; same as gdEffectAlphaBlend</td></tr><tr><td class=CDLEntry>gdEffectOverlay</td><td class=CDLDescription>overlay pixels, see <a href="gd-c.html#gdLayerOverlay" class=LFunction id=link12 onMouseOver="ShowTip(event, 'tt9', 'link12')" onMouseOut="HideTip('tt9')">gdLayerOverlay</a></td></tr><tr><td class=CDLEntry>gdEffectMultiply</td><td class=CDLDescription>overlay pixels with multiply effect, see <a href="gd-c.html#gdLayerMultiply" class=LFunction id=link13 onMouseOver="ShowTip(event, 'tt10', 'link13')" onMouseOut="HideTip('tt10')">gdLayerMultiply</a></td></tr></table><h4 class=CHeading>See also</h4><ul><li><a href="gd-c.html#gdImageAlphaBlending" class=LFunction id=link14 onMouseOver="ShowTip(event, 'tt11', 'link14')" onMouseOut="HideTip('tt11')">gdImageAlphaBlending</a></li></ul></div></div></div>

<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="Color_Quantization"></a>Color Quantization</h3></div></div>

<div class="CEnumeration"><div class=CTopic><h3 class=CTitle><a name="gdPaletteQuantizationMethod"></a>gdPaletteQuantizationMethod</h3><div class=CBody><h4 class=CHeading>Constants</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry><a name="GD_QUANT_DEFAULT"></a>GD_QUANT_DEFAULT</td><td class=CDLDescription>GD_QUANT_LIQ if libimagequant is available, GD_QUANT_JQUANT otherwise.</td></tr><tr><td class=CDLEntry><a name="GD_QUANT_JQUANT"></a>GD_QUANT_JQUANT</td><td class=CDLDescription>libjpeg&rsquo;s old median cut.&nbsp; Fast, but only uses 16-bit color.</td></tr><tr><td class=CDLEntry><a name="GD_QUANT_NEUQUANT"></a>GD_QUANT_NEUQUANT</td><td class=CDLDescription>NeuQuant - approximation using Kohonen neural network.</td></tr><tr><td class=CDLEntry><a name="GD_QUANT_LIQ"></a>GD_QUANT_LIQ</td><td class=CDLDescription>A combination of algorithms used in libimagequant aiming for the highest quality at cost of speed.</td></tr></table><p>Note that GD_QUANT_JQUANT does not retain the alpha channel, and GD_QUANT_NEUQUANT does not support dithering.</p><h4 class=CHeading>See also</h4><ul><li><a href="gd_topal-c.html#gdImageTrueColorToPaletteSetMethod" class=LFunction id=link15 onMouseOver="ShowTip(event, 'tt12', 'link15')" onMouseOut="HideTip('tt12')">gdImageTrueColorToPaletteSetMethod</a></li></ul></div></div></div>

<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="Transform"></a>Transform</h3></div></div>

<div class="CConstant"><div class=CTopic><h3 class=CTitle><a name="gdInterpolationMethod"></a>gdInterpolationMethod</h3><div class=CBody><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry><a name="GD_BELL"></a>GD_BELL</td><td class=CDLDescription>Bell</td></tr><tr><td class=CDLEntry><a name="GD_BESSEL"></a>GD_BESSEL</td><td class=CDLDescription>Bessel</td></tr><tr><td class=CDLEntry><a name="GD_BILINEAR_FIXED"></a>GD_BILINEAR_FIXED</td><td class=CDLDescription>fixed point bilinear</td></tr><tr><td class=CDLEntry><a name="GD_BICUBIC"></a>GD_BICUBIC</td><td class=CDLDescription>Bicubic</td></tr><tr><td class=CDLEntry><a name="GD_BICUBIC_FIXED"></a>GD_BICUBIC_FIXED</td><td class=CDLDescription>fixed point bicubic integer</td></tr><tr><td class=CDLEntry><a name="GD_BLACKMAN"></a>GD_BLACKMAN</td><td class=CDLDescription>Blackman</td></tr><tr><td class=CDLEntry><a name="GD_BOX"></a>GD_BOX</td><td class=CDLDescription>Box</td></tr><tr><td class=CDLEntry><a name="GD_BSPLINE"></a>GD_BSPLINE</td><td class=CDLDescription>BSpline</td></tr><tr><td class=CDLEntry><a name="GD_CATMULLROM"></a>GD_CATMULLROM</td><td class=CDLDescription>Catmullrom</td></tr><tr><td class=CDLEntry><a name="GD_GAUSSIAN"></a>GD_GAUSSIAN</td><td class=CDLDescription>Gaussian</td></tr><tr><td class=CDLEntry><a name="GD_GENERALIZED_CUBIC"></a>GD_GENERALIZED_CUBIC</td><td class=CDLDescription>Generalized cubic</td></tr><tr><td class=CDLEntry><a name="GD_HERMITE"></a>GD_HERMITE</td><td class=CDLDescription>Hermite</td></tr><tr><td class=CDLEntry><a name="GD_HAMMING"></a>GD_HAMMING</td><td class=CDLDescription>Hamming</td></tr><tr><td class=CDLEntry><a name="GD_HANNING"></a>GD_HANNING</td><td class=CDLDescription>Hannig</td></tr><tr><td class=CDLEntry><a name="GD_MITCHELL"></a>GD_MITCHELL</td><td class=CDLDescription>Mitchell</td></tr><tr><td class=CDLEntry><a name="GD_NEAREST_NEIGHBOUR"></a>GD_NEAREST_NEIGHBOUR</td><td class=CDLDescription>Nearest neighbour interpolation</td></tr><tr><td class=CDLEntry><a name="GD_POWER"></a>GD_POWER</td><td class=CDLDescription>Power</td></tr><tr><td class=CDLEntry><a name="GD_QUADRATIC"></a>GD_QUADRATIC</td><td class=CDLDescription>Quadratic</td></tr><tr><td class=CDLEntry><a name="GD_SINC"></a>GD_SINC</td><td class=CDLDescription>Sinc</td></tr><tr><td class=CDLEntry><a name="GD_TRIANGLE"></a>GD_TRIANGLE</td><td class=CDLDescription>Triangle</td></tr><tr><td class=CDLEntry><a name="GD_WEIGHTED4"></a>GD_WEIGHTED4</td><td class=CDLDescription>4 pixels weighted bilinear interpolation</td></tr><tr><td class=CDLEntry><a name="GD_LINEAR"></a>GD_LINEAR</td><td class=CDLDescription>bilinear interpolation</td></tr></table><h4 class=CHeading>See also</h4><ul><li><a href="gd_interpolation-c.html#gdImageSetInterpolationMethod" class=LFunction id=link16 onMouseOver="ShowTip(event, 'tt13', 'link16')" onMouseOut="HideTip('tt13')">gdImageSetInterpolationMethod</a></li><li><a href="gd_interpolation-c.html#gdImageGetInterpolationMethod" class=LFunction id=link17 onMouseOver="ShowTip(event, 'tt14', 'link17')" onMouseOut="HideTip('tt14')">gdImageGetInterpolationMethod</a></li></ul></div></div></div>

<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="Types"></a>Types</h3></div></div>

<div class="CType"><div class=CTopic><h3 class=CTitle><a name="gdImage"></a>gdImage</h3></div></div>

<div class="CType"><div class=CTopic><h3 class=CTitle><a name="gdImagePtr"></a>gdImagePtr</h3><div class=CBody><p>The data structure in which gd stores images.&nbsp; <a href="gd-c.html#gdImageCreate" class=LFunction id=link18 onMouseOver="ShowTip(event, 'tt15', 'link18')" onMouseOut="HideTip('tt15')">gdImageCreate</a>, <a href="gd-c.html#gdImageCreateTrueColor" class=LFunction id=link19 onMouseOver="ShowTip(event, 'tt16', 'link19')" onMouseOut="HideTip('tt16')">gdImageCreateTrueColor</a> and the various image file-loading functions return a pointer to this type, and the other functions expect to receive a pointer to this type as their first argument.</p><p><b>gdImagePtr</b> is a pointer to <b>gdImage</b>.</p><h4 class=CHeading>See also</h4><p><a href="#Accessor_Macros" class=LGroup >Accessor Macros</a></p><p>(Previous versions of this library encouraged directly manipulating the contents ofthe struct but we are attempting to move away from this practice so the fields are no longer documented here.&nbsp;  If you need to poke at the internals of this struct, feel free to look at <b>gd.h</b>.)</p></div></div></div>

<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="Types"></a>Types</h3></div></div>

<div class="CType"><div class=CTopic><h3 class=CTitle><a name="gdPointF"></a>gdPointF</h3><div class=CBody><p>Defines a point in a 2D coordinate system using floating point values. x - Floating point position (increase from left to right) y - Floating point Row position (increase from top to bottom)</p></div></div></div>

<div class="CType"><div class=CTopic><h3 class=CTitle><a name="gdPointFPtr"></a>gdPointFPtr</h3><div class=CBody><p>Pointer to a <a href="#gdPointF" class=LType id=link20 onMouseOver="ShowTip(event, 'tt1', 'link20')" onMouseOut="HideTip('tt1')">gdPointF</a></p><h4 class=CHeading>See also</h4><p><a href="gd-c.html#gdImageCreate" class=LFunction id=link21 onMouseOver="ShowTip(event, 'tt15', 'link21')" onMouseOut="HideTip('tt15')">gdImageCreate</a>, <a href="gd-c.html#gdImageCreateTrueColor" class=LFunction id=link22 onMouseOver="ShowTip(event, 'tt16', 'link22')" onMouseOut="HideTip('tt16')">gdImageCreateTrueColor</a>,</p></div></div></div>

<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="Types"></a>Types</h3></div></div>

<div class="CType"><div class=CTopic><h3 class=CTitle><a name="gdFont"></a>gdFont</h3></div></div>

<div class="CType"><div class=CTopic><h3 class=CTitle><a name="gdFontPtr"></a>gdFontPtr</h3><div class=CBody><p>A font structure, containing the bitmaps of all characters in a font.&nbsp;  Used to declare the characteristics of a font.&nbsp; Text-output functions expect these as their second argument, following the <a href="#gdImagePtr" class=LType id=link23 onMouseOver="ShowTip(event, 'tt17', 'link23')" onMouseOut="HideTip('tt17')">gdImagePtr</a> argument.&nbsp;  <a href="gdfonts-c.html#gdFontGetSmall" class=LFunction id=link24 onMouseOver="ShowTip(event, 'tt18', 'link24')" onMouseOut="HideTip('tt18')">gdFontGetSmall</a> and <a href="gdfontl-c.html#gdFontGetLarge" class=LFunction id=link25 onMouseOver="ShowTip(event, 'tt19', 'link25')" onMouseOut="HideTip('tt19')">gdFontGetLarge</a> both return one.</p><p>You can provide your own font data by providing such a structure and the associated pixel array.&nbsp; You can determine the width and height of a single character in a font by examining the w and h members of the structure.&nbsp; If you will not be creating your own fonts, you will not need to concern yourself with the rest of the components of this structure.</p><p>Please see the files gdfontl.c and gdfontl.h for an example of the proper declaration of this structure.</p><blockquote><pre>typedef struct {
  // # of characters in font
  int nchars;
  // First character is numbered... (usually 32 = space)
  int offset;
  // Character width and height
  int w;
  int h;
  // Font data; array of characters, one row after another.
  // Easily included in code, also easily loaded from
  // data files.
  char *data;
} gdFont;</pre></blockquote><p>gdFontPtr is a pointer to gdFont.</p></div></div></div>

<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="Colors"></a>Colors</h3><div class=CBody><p>Colors are always of type int which is supposed to be at least 32 bit large.</p><h4 class=CHeading>Kinds of colors</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>true colors</td><td class=CDLDescription>ARGB values where the alpha channel is stored as most significant, and the blue channel as least significant byte.&nbsp; Note that the alpha channel only uses the 7 least significant bits.&nbsp; Don&rsquo;t rely on the internal representation, though, and use <a href="#gdTrueColorAlpha" class=LMacro id=link26 onMouseOver="ShowTip(event, 'tt7', 'link26')" onMouseOut="HideTip('tt7')">gdTrueColorAlpha</a> to compose a truecolor value, and <a href="#gdTrueColorGetAlpha" class=LMacro id=link27 onMouseOver="ShowTip(event, 'tt20', 'link27')" onMouseOut="HideTip('tt20')">gdTrueColorGetAlpha</a>, <a href="#gdTrueColorGetRed" class=LMacro id=link28 onMouseOver="ShowTip(event, 'tt21', 'link28')" onMouseOut="HideTip('tt21')">gdTrueColorGetRed</a>, <a href="#gdTrueColorGetGreen" class=LMacro id=link29 onMouseOver="ShowTip(event, 'tt22', 'link29')" onMouseOut="HideTip('tt22')">gdTrueColorGetGreen</a> and <a href="#gdTrueColorGetBlue" class=LMacro id=link30 onMouseOver="ShowTip(event, 'tt23', 'link30')" onMouseOut="HideTip('tt23')">gdTrueColorGetBlue</a> to access the respective channels.</td></tr><tr><td class=CDLEntry>palette indexes</td><td class=CDLDescription>The index of a color palette entry (0-255).</td></tr><tr><td class=CDLEntry>special colors</td><td class=CDLDescription>As listed in the following section.</td></tr></table></div></div></div>

<div class="CConstant"><div class=CTopic><h3 class=CTitle><a name="Special_Colors"></a>Special Colors</h3><div class=CBody><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry><a name="gdStyled"></a>gdStyled</td><td class=CDLDescription>use the current style, see <a href="gd-c.html#gdImageSetStyle" class=LFunction id=link31 onMouseOver="ShowTip(event, 'tt24', 'link31')" onMouseOut="HideTip('tt24')">gdImageSetStyle</a></td></tr><tr><td class=CDLEntry><a name="gdBrushed"></a>gdBrushed</td><td class=CDLDescription>use the current brush, see <a href="gd-c.html#gdImageSetBrush" class=LFunction id=link32 onMouseOver="ShowTip(event, 'tt25', 'link32')" onMouseOut="HideTip('tt25')">gdImageSetBrush</a></td></tr><tr><td class=CDLEntry><a name="gdStyledBrushed"></a>gdStyledBrushed</td><td class=CDLDescription>use the current style and brush</td></tr><tr><td class=CDLEntry><a name="gdTiled"></a>gdTiled</td><td class=CDLDescription>use the current tile, see <a href="gd-c.html#gdImageSetTile" class=LFunction id=link33 onMouseOver="ShowTip(event, 'tt26', 'link33')" onMouseOut="HideTip('tt26')">gdImageSetTile</a></td></tr><tr><td class=CDLEntry><a name="gdTransparent"></a>gdTransparent</td><td class=CDLDescription>indicate transparency, what is not the same as the transparent color index; used for lines only</td></tr><tr><td class=CDLEntry><a name="gdAntiAliased"></a>gdAntiAliased</td><td class=CDLDescription>draw anti aliased</td></tr></table></div></div></div>

<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="Types"></a>Types</h3></div></div>

<div class="CType"><div class=CTopic><h3 class=CTitle><a name="gdSource"></a>gdSource</h3></div></div>

<div class="CType"><div class=CTopic><h3 class=CTitle><a name="gdSourcePtr"></a>gdSourcePtr</h3><div class=CBody><p><b>Note:</b> This interface is <b>obsolete</b> and kept only for *compatibility.&nbsp;  Use <a href="gd_io-h.html#gdIOCtx" class=LType id=link34 onMouseOver="ShowTip(event, 'tt27', 'link34')" onMouseOut="HideTip('tt27')">gdIOCtx</a> instead.</p><p>Represents a source from which a PNG can be read.&nbsp; Programmers who do not wish to read PNGs from a file can provide their own alternate input mechanism, using the <a href="gd_ss-c.html#gdImageCreateFromPngSource" class=LFunction id=link35 onMouseOver="ShowTip(event, 'tt28', 'link35')" onMouseOut="HideTip('tt28')">gdImageCreateFromPngSource</a> function.&nbsp; See the documentation of that function for an example of the proper use of this type.</p><blockquote><pre>typedef struct {
        int (*source) (void *context, char *buffer, int len);
        void *context;
} gdSource, *gdSourcePtr;</pre></blockquote><p>The source function must return -1 on error, otherwise the number of bytes fetched.&nbsp; 0 is EOF, not an error!</p><p>&rsquo;context&rsquo; will be passed to your source function.</p></div></div></div>

<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="Types"></a>Types</h3></div></div>

<div class="CType"><div class=CTopic><h3 class=CTitle><a name="gdFTStringExtra"></a>gdFTStringExtra</h3></div></div>

<div class="CType"><div class=CTopic><h3 class=CTitle><a name="gdFTStringExtraPtr"></a>gdFTStringExtraPtr</h3><div class=CBody><p>A structure and associated pointer type used to pass additional parameters to the <a href="gdft-c.html#gdImageStringFTEx" class=LFunction id=link36 onMouseOver="ShowTip(event, 'tt2', 'link36')" onMouseOut="HideTip('tt2')">gdImageStringFTEx</a> function.&nbsp; See <a href="gdft-c.html#gdImageStringFTEx" class=LFunction id=link37 onMouseOver="ShowTip(event, 'tt2', 'link37')" onMouseOut="HideTip('tt2')">gdImageStringFTEx</a> for the structure definition.</p><p>Thanks to Wez Furlong.</p></div></div></div>

<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="Types"></a>Types</h3></div></div>

<div class="CType"><div class=CTopic><h3 class=CTitle><a name="gdPoint"></a>gdPoint</h3></div></div>

<div class="CType"><div class=CTopic><h3 class=CTitle><a name="gdPointPtr"></a>gdPointPtr</h3><div class=CBody><p>Represents a point in the coordinate space of the image; used by <a href="gd-c.html#gdImagePolygon" class=LFunction id=link38 onMouseOver="ShowTip(event, 'tt3', 'link38')" onMouseOut="HideTip('tt3')">gdImagePolygon</a>, <a href="gd-c.html#gdImageOpenPolygon" class=LFunction id=link39 onMouseOver="ShowTip(event, 'tt4', 'link39')" onMouseOut="HideTip('tt4')">gdImageOpenPolygon</a> and <a href="gd-c.html#gdImageFilledPolygon" class=LFunction id=link40 onMouseOver="ShowTip(event, 'tt5', 'link40')" onMouseOut="HideTip('tt5')">gdImageFilledPolygon</a> for polygon drawing.</p><blockquote><pre>typedef struct {
    int x, y;
} gdPoint, *gdPointPtr;</pre></blockquote></div></div></div>

<div class="CType"><div class=CTopic><h3 class=CTitle><a name="gdRect"></a>gdRect</h3><div class=CBody><p>A rectangle in the coordinate space of the image</p><h4 class=CHeading>Members</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>x</td><td class=CDLDescription>The x-coordinate of the upper left corner.</td></tr><tr><td class=CDLEntry>y</td><td class=CDLDescription>The y-coordinate of the upper left corner.</td></tr><tr><td class=CDLEntry>width</td><td class=CDLDescription>The width.</td></tr><tr><td class=CDLEntry>height</td><td class=CDLDescription>The height.</td></tr></table></div></div></div>

<div class="CType"><div class=CTopic><h3 class=CTitle><a name="gdRectPtr"></a>gdRectPtr</h3><div class=CBody><p>A pointer to a <a href="#gdRect" class=LType id=link41 onMouseOver="ShowTip(event, 'tt6', 'link41')" onMouseOut="HideTip('tt6')">gdRect</a></p></div></div></div>

<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="Color_Composition"></a>Color Composition</h3></div></div>

<div class="CMacro"><div class=CTopic><h3 class=CTitle><a name="gdTrueColorAlpha"></a>gdTrueColorAlpha</h3><div class=CBody><p>Compose a truecolor value from its components</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>r</td><td class=CDLDescription>The red channel (0-255)</td></tr><tr><td class=CDLEntry>g</td><td class=CDLDescription>The green channel (0-255)</td></tr><tr><td class=CDLEntry>b</td><td class=CDLDescription>The blue channel (0-255)</td></tr><tr><td class=CDLEntry>a</td><td class=CDLDescription>The alpha channel (0-127, where 127 is fully transparent, and 0 is completely opaque).</td></tr></table><h4 class=CHeading>See also</h4><ul><li><a href="#gdTrueColorGetAlpha" class=LMacro id=link42 onMouseOver="ShowTip(event, 'tt20', 'link42')" onMouseOut="HideTip('tt20')">gdTrueColorGetAlpha</a></li><li><a href="#gdTrueColorGetRed" class=LMacro id=link43 onMouseOver="ShowTip(event, 'tt21', 'link43')" onMouseOut="HideTip('tt21')">gdTrueColorGetRed</a></li><li><a href="#gdTrueColorGetGreen" class=LMacro id=link44 onMouseOver="ShowTip(event, 'tt22', 'link44')" onMouseOut="HideTip('tt22')">gdTrueColorGetGreen</a></li><li><a href="#gdTrueColorGetBlue" class=LMacro id=link45 onMouseOver="ShowTip(event, 'tt23', 'link45')" onMouseOut="HideTip('tt23')">gdTrueColorGetBlue</a></li><li><a href="gd-c.html#gdImageColorExactAlpha" class=LFunction id=link46 onMouseOver="ShowTip(event, 'tt29', 'link46')" onMouseOut="HideTip('tt29')">gdImageColorExactAlpha</a></li></ul></div></div></div>

<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="GifAnim"></a>GifAnim</h3><div class=CBody><p>Legal values for Disposal. gdDisposalNone is always used by the built-in optimizer if previm is passed.</p></div></div></div>

<div class="CConstant"><div class=CTopic><h3 class=CTitle><a name="gdImageGifAnim"></a>gdImageGifAnim</h3><div class=CBody><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry><a name="gdDisposalUnknown"></a>gdDisposalUnknown</td><td class=CDLDescription>Not recommended</td></tr><tr><td class=CDLEntry><a name="gdDisposalNone"></a>gdDisposalNone</td><td class=CDLDescription>Preserve previous frame</td></tr><tr><td class=CDLEntry><a name="gdDisposalRestoreBackground"></a>gdDisposalRestoreBackground</td><td class=CDLDescription>First allocated color of palette</td></tr><tr><td class=CDLEntry><a name="gdDisposalRestorePrevious"></a>gdDisposalRestorePrevious</td><td class=CDLDescription>Restore to before start of frame</td></tr></table><h4 class=CHeading>See also</h4><ul><li><a href="gd_gif_out-c.html#gdImageGifAnimAdd" class=LFunction id=link47 onMouseOver="ShowTip(event, 'tt30', 'link47')" onMouseOut="HideTip('tt30')">gdImageGifAnimAdd</a></li></ul></div></div></div>

<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="Types"></a>Types</h3></div></div>

<div class="CType"><div class=CTopic><h3 class=CTitle><a name="gdSink"></a>gdSink</h3></div></div>

<div class="CType"><div class=CTopic><h3 class=CTitle><a name="gdSinkPtr"></a>gdSinkPtr</h3><div class=CBody><p><b>Note:</b> This interface is <b>obsolete</b> and kept only for <b>compatibility</b>.&nbsp;  Use <a href="gd_io-h.html#gdIOCtx" class=LType id=link48 onMouseOver="ShowTip(event, 'tt27', 'link48')" onMouseOut="HideTip('tt27')">gdIOCtx</a> instead.</p><p>Represents a &ldquo;sink&rdquo; (destination) to which a PNG can be written.&nbsp; Programmers who do not wish to write PNGs to a file can provide their own alternate output mechanism, using the <a href="gd_ss-c.html#gdImagePngToSink" class=LFunction id=link49 onMouseOver="ShowTip(event, 'tt31', 'link49')" onMouseOut="HideTip('tt31')">gdImagePngToSink</a> function.&nbsp; See the documentation of that function for an example of the proper use of this type.</p><blockquote><pre>typedef struct {
    int (*sink) (void *context, char *buffer, int len);
    void *context;
} gdSink, *gdSinkPtr;</pre></blockquote><p>The <u>sink</u> function must return -1 on error, otherwise the number of bytes written, which must be equal to len.</p><p><u>context</u> will be passed to your sink function.</p></div></div></div>

<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="Accessor_Macros"></a>Accessor Macros</h3></div></div>

<div class="CMacro"><div class=CTopic><h3 class=CTitle><a name="gdImageTrueColor"></a>gdImageTrueColor</h3><div class=CBody><p>Whether an image is a truecolor image.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>im</td><td class=CDLDescription>The image.</td></tr></table><h4 class=CHeading>Returns</h4><p>Non-zero if the image is a truecolor image, zero for palette images.</p></div></div></div>

<div class="CMacro"><div class=CTopic><h3 class=CTitle><a name="gdImageSX"></a>gdImageSX</h3><div class=CBody><p>Gets the width (in pixels) of an image.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>im</td><td class=CDLDescription>The image.</td></tr></table></div></div></div>

<div class="CMacro"><div class=CTopic><h3 class=CTitle><a name="gdImageSY"></a>gdImageSY</h3><div class=CBody><p>Gets the height (in pixels) of an image.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>im</td><td class=CDLDescription>The image.</td></tr></table></div></div></div>

<div class="CMacro"><div class=CTopic><h3 class=CTitle><a name="gdImageColorsTotal"></a>gdImageColorsTotal</h3><div class=CBody><p>Gets the number of colors in the palette.</p><p>This macro is only valid for palette images.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>im</td><td class=CDLDescription>The image</td></tr></table></div></div></div>

<div class="CMacro"><div class=CTopic><h3 class=CTitle><a name="gdImageRed"></a>gdImageRed</h3><div class=CBody><p>Gets the red component value of a given color.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>im</td><td class=CDLDescription>The image.</td></tr><tr><td class=CDLEntry>c</td><td class=CDLDescription>The color.</td></tr></table></div></div></div>

<div class="CMacro"><div class=CTopic><h3 class=CTitle><a name="gdImageGreen"></a>gdImageGreen</h3><div class=CBody><p>Gets the green component value of a given color.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>im</td><td class=CDLDescription>The image.</td></tr><tr><td class=CDLEntry>c</td><td class=CDLDescription>The color.</td></tr></table></div></div></div>

<div class="CMacro"><div class=CTopic><h3 class=CTitle><a name="gdImageBlue"></a>gdImageBlue</h3><div class=CBody><p>Gets the blue component value of a given color.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>im</td><td class=CDLDescription>The image.</td></tr><tr><td class=CDLEntry>c</td><td class=CDLDescription>The color.</td></tr></table></div></div></div>

<div class="CMacro"><div class=CTopic><h3 class=CTitle><a name="gdImageAlpha"></a>gdImageAlpha</h3><div class=CBody><p>Gets the alpha component value of a given color.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>im</td><td class=CDLDescription>The image.</td></tr><tr><td class=CDLEntry>c</td><td class=CDLDescription>The color.</td></tr></table></div></div></div>

<div class="CMacro"><div class=CTopic><h3 class=CTitle><a name="gdImageGetTransparent"></a>gdImageGetTransparent</h3><div class=CBody><p>Gets the transparent color of the image.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>im</td><td class=CDLDescription>The image.</td></tr></table><h4 class=CHeading>See also</h4><ul><li><a href="gd-c.html#gdImageColorTransparent" class=LFunction id=link50 onMouseOver="ShowTip(event, 'tt32', 'link50')" onMouseOut="HideTip('tt32')">gdImageColorTransparent</a></li></ul></div></div></div>

<div class="CMacro"><div class=CTopic><h3 class=CTitle><a name="gdImageGetInterlaced"></a>gdImageGetInterlaced</h3><div class=CBody><p>Whether an image is interlaced.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>im</td><td class=CDLDescription>The image.</td></tr></table><h4 class=CHeading>Returns</h4><p>Non-zero for interlaced images, zero otherwise.</p><h4 class=CHeading>See also</h4><ul><li><a href="gd-c.html#gdImageInterlace" class=LFunction id=link51 onMouseOver="ShowTip(event, 'tt33', 'link51')" onMouseOut="HideTip('tt33')">gdImageInterlace</a></li></ul></div></div></div>

<div class="CMacro"><div class=CTopic><h3 class=CTitle><a name="gdImagePalettePixel"></a>gdImagePalettePixel</h3><div class=CBody><p>Gets the color of a pixel.</p><p>Calling this macro is only valid for palette images.&nbsp; No bounds checking is done for the coordinates.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>im</td><td class=CDLDescription>The image.</td></tr><tr><td class=CDLEntry>x</td><td class=CDLDescription>The x-coordinate.</td></tr><tr><td class=CDLEntry>y</td><td class=CDLDescription>The y-coordinate.</td></tr></table><h4 class=CHeading>See also</h4><ul><li><a href="#gdImageTrueColorPixel" class=LMacro id=link52 onMouseOver="ShowTip(event, 'tt34', 'link52')" onMouseOut="HideTip('tt34')">gdImageTrueColorPixel</a></li><li><a href="gd-c.html#gdImageGetPixel" class=LFunction id=link53 onMouseOver="ShowTip(event, 'tt35', 'link53')" onMouseOut="HideTip('tt35')">gdImageGetPixel</a></li></ul></div></div></div>

<div class="CMacro"><div class=CTopic><h3 class=CTitle><a name="gdImageTrueColorPixel"></a>gdImageTrueColorPixel</h3><div class=CBody><p>Gets the color of a pixel.</p><p>Calling this macro is only valid for truecolor images.&nbsp; No bounds checking is done for the coordinates.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>im</td><td class=CDLDescription>The image.</td></tr><tr><td class=CDLEntry>x</td><td class=CDLDescription>The x-coordinate.</td></tr><tr><td class=CDLEntry>y</td><td class=CDLDescription>The y-coordinate.</td></tr></table><h4 class=CHeading>See also</h4><ul><li><a href="#gdImagePalettePixel" class=LMacro id=link54 onMouseOver="ShowTip(event, 'tt36', 'link54')" onMouseOut="HideTip('tt36')">gdImagePalettePixel</a></li><li><a href="gd-c.html#gdImageGetTrueColorPixel" class=LFunction id=link55 onMouseOver="ShowTip(event, 'tt37', 'link55')" onMouseOut="HideTip('tt37')">gdImageGetTrueColorPixel</a></li></ul></div></div></div>

<div class="CMacro"><div class=CTopic><h3 class=CTitle><a name="gdImageResolutionX"></a>gdImageResolutionX</h3><div class=CBody><p>Gets the horizontal resolution in DPI.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>im</td><td class=CDLDescription>The image.</td></tr></table><h4 class=CHeading>See also</h4><ul><li><a href="#gdImageResolutionY" class=LMacro id=link56 onMouseOver="ShowTip(event, 'tt38', 'link56')" onMouseOut="HideTip('tt38')">gdImageResolutionY</a></li><li><a href="gd-c.html#gdImageSetResolution" class=LFunction id=link57 onMouseOver="ShowTip(event, 'tt39', 'link57')" onMouseOut="HideTip('tt39')">gdImageSetResolution</a></li></ul></div></div></div>

<div class="CMacro"><div class=CTopic><h3 class=CTitle><a name="gdImageResolutionY"></a>gdImageResolutionY</h3><div class=CBody><p>Gets the vertical resolution in DPI.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>im</td><td class=CDLDescription>The image.</td></tr></table><h4 class=CHeading>See also</h4><ul><li><a href="#gdImageResolutionX" class=LMacro id=link58 onMouseOver="ShowTip(event, 'tt40', 'link58')" onMouseOut="HideTip('tt40')">gdImageResolutionX</a></li><li><a href="gd-c.html#gdImageSetResolution" class=LFunction id=link59 onMouseOver="ShowTip(event, 'tt39', 'link59')" onMouseOut="HideTip('tt39')">gdImageSetResolution</a></li></ul></div></div></div>

<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="Crop"></a>Crop</h3></div></div>

<div class="CConstant"><div class=CTopic><h3 class=CTitle><a name="gdCropMode"></a>gdCropMode</h3><div class=CBody><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry><a name="GD_CROP_DEFAULT"></a>GD_CROP_DEFAULT</td><td class=CDLDescription>Default crop mode (4 corners or background)</td></tr><tr><td class=CDLEntry><a name="GD_CROP_TRANSPARENT"></a>GD_CROP_TRANSPARENT</td><td class=CDLDescription>Crop using the transparent color</td></tr><tr><td class=CDLEntry><a name="GD_CROP_BLACK"></a>GD_CROP_BLACK</td><td class=CDLDescription>Crop black borders</td></tr><tr><td class=CDLEntry><a name="GD_CROP_WHITE"></a>GD_CROP_WHITE</td><td class=CDLDescription>Crop white borders</td></tr><tr><td class=CDLEntry><a name="GD_CROP_SIDES"></a>GD_CROP_SIDES</td><td class=CDLDescription>Crop using colors of the 4 corners</td></tr></table><h4 class=CHeading>See also</h4><ul><li><a href="gd_crop-c.html#gdImageCropAuto" class=LFunction id=link60 onMouseOver="ShowTip(event, 'tt41', 'link60')" onMouseOut="HideTip('tt41')">gdImageCropAuto</a></li></ul></div></div></div>

<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="Image_Comparison"></a>Image Comparison</h3><div class=CBody><h4 class=CHeading>Constants</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>GD_CMP_IMAGE</td><td class=CDLDescription>Actual image IS different</td></tr><tr><td class=CDLEntry>GD_CMP_NUM_COLORS</td><td class=CDLDescription>Number of colors in pallette differ</td></tr><tr><td class=CDLEntry>GD_CMP_COLOR</td><td class=CDLDescription>Image colors differ</td></tr><tr><td class=CDLEntry>GD_CMP_SIZE_X</td><td class=CDLDescription>Image width differs</td></tr><tr><td class=CDLEntry>GD_CMP_SIZE_Y</td><td class=CDLDescription>Image heights differ</td></tr><tr><td class=CDLEntry>GD_CMP_TRANSPARENT</td><td class=CDLDescription>Transparent color differs</td></tr><tr><td class=CDLEntry>GD_CMP_BACKGROUND</td><td class=CDLDescription>Background color differs</td></tr><tr><td class=CDLEntry>GD_CMP_INTERLACE</td><td class=CDLDescription>Interlaced setting differs</td></tr><tr><td class=CDLEntry>GD_CMP_TRUECOLOR</td><td class=CDLDescription>Truecolor vs palette differs</td></tr></table><h4 class=CHeading>See also</h4><ul><li><a href="gd-c.html#gdImageCompare" class=LFunction id=link61 onMouseOver="ShowTip(event, 'tt42', 'link61')" onMouseOut="HideTip('tt42')">gdImageCompare</a></li></ul></div></div></div>

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<!--START_ND_TOOLTIPS-->
<div class=CToolTip id="tt1"><div class=CType>Defines a point in a 2D coordinate system using floating point values. </div></div><div class=CToolTip id="tt2"><div class=CFunction>gdImageStringFTEx extends the capabilities of gdImageStringFT by providing a way to pass additional parameters.</div></div><div class=CToolTip id="tt3"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>void gdImagePolygon (</td><td class="PType  prettyprint " nowrap>gdImagePtr&nbsp;</td><td class="PParameter  prettyprint " nowrap>im,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>gdPointPtr&nbsp;</td><td class="PParameter  prettyprint " nowrap>p,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>int&nbsp;</td><td class="PParameter  prettyprint " nowrap>n,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>int&nbsp;</td><td class="PParameter  prettyprint " nowrap>c</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Draws a closed polygon</div></div><div class=CToolTip id="tt4"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>void gdImageOpenPolygon (</td><td class="PType  prettyprint " nowrap>gdImagePtr&nbsp;</td><td class="PParameter  prettyprint " nowrap>im,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>gdPointPtr&nbsp;</td><td class="PParameter  prettyprint " nowrap>p,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>int&nbsp;</td><td class="PParameter  prettyprint " nowrap>n,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>int&nbsp;</td><td class="PParameter  prettyprint " nowrap>c</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Draws an open polygon</div></div><div class=CToolTip id="tt5"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>void gdImageFilledPolygon (</td><td class="PType  prettyprint " nowrap>gdImagePtr&nbsp;</td><td class="PParameter  prettyprint " nowrap>im,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>gdPointPtr&nbsp;</td><td class="PParameter  prettyprint " nowrap>p,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>int&nbsp;</td><td class="PParameter  prettyprint " nowrap>n,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>int&nbsp;</td><td class="PParameter  prettyprint " nowrap>c</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Draws a filled polygon</div></div><div class=CToolTip id="tt6"><div class=CType>A rectangle in the coordinate space of the image</div></div><div class=CToolTip id="tt7"><div class=CMacro>Compose a truecolor value from its components</div></div><div class=CToolTip id="tt8"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>int gdAlphaBlend (</td><td class="PType  prettyprint " nowrap>int&nbsp;</td><td class="PParameter  prettyprint " nowrap>dst,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>int&nbsp;</td><td class="PParameter  prettyprint " nowrap>src</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Blend two colors</div></div><div class=CToolTip id="tt9"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>int gdLayerOverlay (</td><td class="PType  prettyprint " nowrap>int&nbsp;</td><td class="PParameter  prettyprint " nowrap>dst,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>int&nbsp;</td><td class="PParameter  prettyprint " nowrap>src</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Overlay two colors</div></div><div class=CToolTip id="tt10"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>int gdLayerMultiply (</td><td class="PType  prettyprint " nowrap>int&nbsp;</td><td class="PParameter  prettyprint " nowrap>dst,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>int&nbsp;</td><td class="PParameter  prettyprint " nowrap>src</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Overlay two colors with multiply effect</div></div><div class=CToolTip id="tt11"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>void gdImageAlphaBlending (</td><td class="PType  prettyprint " nowrap>gdImagePtr&nbsp;</td><td class="PParameter  prettyprint " nowrap>im,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>int&nbsp;</td><td class="PParameter  prettyprint " nowrap>alphaBlendingArg</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Set the effect for subsequent drawing operations</div></div><div class=CToolTip id="tt12"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>int gdImageTrueColorToPaletteSetMethod (</td><td class="PType  prettyprint " nowrap>gdImagePtr&nbsp;</td><td class="PParameter  prettyprint " nowrap>im,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>int&nbsp;</td><td class="PParameter  prettyprint " nowrap>method,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>int&nbsp;</td><td class="PParameter  prettyprint " nowrap>speed</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Selects the quantization method</div></div><div class=CToolTip id="tt13"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>int gdImageSetInterpolationMethod(</td><td class="PType  prettyprint " nowrap>gdImagePtr&nbsp;</td><td class="PParameter  prettyprint " nowrap>im,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>gdInterpolationMethod&nbsp;</td><td class="PParameter  prettyprint " nowrap>id</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Set the interpolation method for subsequent operations</div></div><div class=CToolTip id="tt14"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>gdInterpolationMethod gdImageGetInterpolationMethod(</td><td class="PType  prettyprint " nowrap>gdImagePtr&nbsp;</td><td class="PParameter  prettyprint " nowrap>im</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Get the current interpolation method</div></div><div class=CToolTip id="tt15"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>gdImagePtr gdImageCreate (</td><td class="PType  prettyprint " nowrap>int&nbsp;</td><td class="PParameter  prettyprint " nowrap>sx,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>int&nbsp;</td><td class="PParameter  prettyprint " nowrap>sy</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>gdImageCreate is called to create palette-based images, with no more than 256 colors. </div></div><div class=CToolTip id="tt16"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>gdImagePtr gdImageCreateTrueColor (</td><td class="PType  prettyprint " nowrap>int&nbsp;</td><td class="PParameter  prettyprint " nowrap>sx,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>int&nbsp;</td><td class="PParameter  prettyprint " nowrap>sy</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>gdImageCreateTrueColor is called to create truecolor images, with an essentially unlimited number of colors. </div></div><div class=CToolTip id="tt17"><div class=CType>The data structure in which gd stores images. </div></div><div class=CToolTip id="tt18"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>gdFontPtr gdFontGetSmall (</td><td class="PParameter  prettyprint " nowrap>void</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Returns the built-in small font.</div></div><div class=CToolTip id="tt19"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>gdFontPtr gdFontGetLarge (</td><td class="PParameter  prettyprint " nowrap>void</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Returns the built-in large font.</div></div><div class=CToolTip id="tt20"><div class=CMacro>Gets the alpha channel value</div></div><div class=CToolTip id="tt21"><div class=CMacro>Gets the red channel value</div></div><div class=CToolTip id="tt22"><div class=CMacro>Gets the green channel value</div></div><div class=CToolTip id="tt23"><div class=CMacro>Gets the blue channel value</div></div><div class=CToolTip id="tt24"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>void gdImageSetStyle (</td><td class="PType  prettyprint " nowrap>gdImagePtr&nbsp;</td><td class="PParameterPrefix  prettyprint " nowrap></td><td class="PParameter  prettyprint " nowrap>im,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>int&nbsp;</td><td class="PParameterPrefix  prettyprint " nowrap>*</td><td class="PParameter  prettyprint " nowrap>style,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>int&nbsp;</td><td class="PParameterPrefix  prettyprint " nowrap></td><td class="PParameter  prettyprint " nowrap>noOfPixels</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Sets the style for following drawing operations</div></div><div class=CToolTip id="tt25"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>void gdImageSetBrush (</td><td class="PType  prettyprint " nowrap>gdImagePtr&nbsp;</td><td class="PParameter  prettyprint " nowrap>im,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>gdImagePtr&nbsp;</td><td class="PParameter  prettyprint " nowrap>brush</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Sets the brush for following drawing operations</div></div><div class=CToolTip id="tt26"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>void gdImageSetTile (</td><td class="PType  prettyprint " nowrap>gdImagePtr&nbsp;</td><td class="PParameter  prettyprint " nowrap>im,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>gdImagePtr&nbsp;</td><td class="PParameter  prettyprint " nowrap>tile</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote></div></div><div class=CToolTip id="tt27"><div class=CType>gdIOCtx structures hold function pointers for doing image IO.</div></div><div class=CToolTip id="tt28"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>gdImagePtr gdImageCreateFromPngSource (</td><td class="PType  prettyprint " nowrap>gdSourcePtr&nbsp;</td><td class="PParameter  prettyprint " nowrap>inSource</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>See gdImageCreateFromPng for documentation. </div></div><div class=CToolTip id="tt29"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>int gdImageColorExactAlpha (</td><td class="PType  prettyprint " nowrap>gdImagePtr&nbsp;</td><td class="PParameter  prettyprint " nowrap>im,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>int&nbsp;</td><td class="PParameter  prettyprint " nowrap>r,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>int&nbsp;</td><td class="PParameter  prettyprint " nowrap>g,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>int&nbsp;</td><td class="PParameter  prettyprint " nowrap>b,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>int&nbsp;</td><td class="PParameter  prettyprint " nowrap>a</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Gets the exact color of the image</div></div><div class=CToolTip id="tt30"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>void gdImageGifAnimAdd(</td><td class="PType  prettyprint " nowrap>gdImagePtr&nbsp;</td><td class="PParameterPrefix  prettyprint " nowrap></td><td class="PParameter  prettyprint " nowrap>im,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>FILE&nbsp;</td><td class="PParameterPrefix  prettyprint " nowrap>*</td><td class="PParameter  prettyprint " nowrap>outFile,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>int&nbsp;</td><td class="PParameterPrefix  prettyprint " nowrap></td><td class="PParameter  prettyprint " nowrap>LocalCM,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>int&nbsp;</td><td class="PParameterPrefix  prettyprint " nowrap></td><td class="PParameter  prettyprint " nowrap>LeftOfs,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>int&nbsp;</td><td class="PParameterPrefix  prettyprint " nowrap></td><td class="PParameter  prettyprint " nowrap>TopOfs,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>int&nbsp;</td><td class="PParameterPrefix  prettyprint " nowrap></td><td class="PParameter  prettyprint " nowrap>Delay,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>int&nbsp;</td><td class="PParameterPrefix  prettyprint " nowrap></td><td class="PParameter  prettyprint " nowrap>Disposal,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>gdImagePtr&nbsp;</td><td class="PParameterPrefix  prettyprint " nowrap></td><td class="PParameter  prettyprint " nowrap>previm</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>This function writes GIF animation frames to GIF animation, which was initialized with gdImageGifAnimBegin. </div></div><div class=CToolTip id="tt31"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>void gdImagePngToSink (</td><td class="PType  prettyprint " nowrap>gdImagePtr&nbsp;</td><td class="PParameter  prettyprint " nowrap>im,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>gdSinkPtr&nbsp;</td><td class="PParameter  prettyprint " nowrap>outSink</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote></div></div><div class=CToolTip id="tt32"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>void gdImageColorTransparent (</td><td class="PType  prettyprint " nowrap>gdImagePtr&nbsp;</td><td class="PParameter  prettyprint " nowrap>im,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>int&nbsp;</td><td class="PParameter  prettyprint " nowrap>color</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Sets the transparent color of the image</div></div><div class=CToolTip id="tt33"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>void gdImageInterlace (</td><td class="PType  prettyprint " nowrap>gdImagePtr&nbsp;</td><td class="PParameter  prettyprint " nowrap>im,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>int&nbsp;</td><td class="PParameter  prettyprint " nowrap>interlaceArg</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Sets whether an image is interlaced</div></div><div class=CToolTip id="tt34"><div class=CMacro>Gets the color of a pixel.</div></div><div class=CToolTip id="tt35"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>int gdImageGetPixel (</td><td class="PType  prettyprint " nowrap>gdImagePtr&nbsp;</td><td class="PParameter  prettyprint " nowrap>im,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>int&nbsp;</td><td class="PParameter  prettyprint " nowrap>x,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>int&nbsp;</td><td class="PParameter  prettyprint " nowrap>y</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Gets a pixel color as stored in the image.</div></div><div class=CToolTip id="tt36"><div class=CMacro>Gets the color of a pixel.</div></div><div class=CToolTip id="tt37"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>int gdImageGetTrueColorPixel (</td><td class="PType  prettyprint " nowrap>gdImagePtr&nbsp;</td><td class="PParameter  prettyprint " nowrap>im,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>int&nbsp;</td><td class="PParameter  prettyprint " nowrap>x,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>int&nbsp;</td><td class="PParameter  prettyprint " nowrap>y</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Gets a pixel color always as truecolor value.</div></div><div class=CToolTip id="tt38"><div class=CMacro>Gets the vertical resolution in DPI.</div></div><div class=CToolTip id="tt39"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>void gdImageSetResolution(</td><td class="PTypePrefix  prettyprint " nowrap></td><td class="PType  prettyprint " nowrap>gdImagePtr&nbsp;</td><td class="PParameter  prettyprint " nowrap>im,</td></tr><tr><td></td><td class="PTypePrefix  prettyprint " nowrap>const unsigned&nbsp;</td><td class="PType  prettyprint " nowrap>int&nbsp;</td><td class="PParameter  prettyprint " nowrap>res_x,</td></tr><tr><td></td><td class="PTypePrefix  prettyprint " nowrap>const unsigned&nbsp;</td><td class="PType  prettyprint " nowrap>int&nbsp;</td><td class="PParameter  prettyprint " nowrap>res_y</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Sets the resolution of an image.</div></div><div class=CToolTip id="tt40"><div class=CMacro>Gets the horizontal resolution in DPI.</div></div><div class=CToolTip id="tt41"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>gdImagePtr gdImageCropAuto(</td><td class="PTypePrefix  prettyprint " nowrap></td><td class="PType  prettyprint " nowrap>gdImagePtr&nbsp;</td><td class="PParameter  prettyprint " nowrap>im,</td></tr><tr><td></td><td class="PTypePrefix  prettyprint " nowrap>const unsigned&nbsp;</td><td class="PType  prettyprint " nowrap>int&nbsp;</td><td class="PParameter  prettyprint " nowrap>mode</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Crop an image automatically</div></div><div class=CToolTip id="tt42"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>int gdImageCompare (</td><td class="PType  prettyprint " nowrap>gdImagePtr&nbsp;</td><td class="PParameter  prettyprint " nowrap>im1,</td></tr><tr><td></td><td class="PType  prettyprint " nowrap>gdImagePtr&nbsp;</td><td class="PParameter  prettyprint " nowrap>im2</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Compare two images</div></div><!--END_ND_TOOLTIPS-->




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