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+\{\
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+. ds ae ae
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+.\}
+.rm #[ #] #H #V #F C
+.\" ========================================================================
+.\"
+.IX Title "DVIPNG 1"
+.TH DVIPNG 1 "2010-12-15" "dvipng 1.14" "User commands"
+.\" For nroff, turn off justification. Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+.nh
+.SH "NAME"
+dvipng \- A DVI\-to\-PNG translator
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+dvipng [options] filename
+.PP
+dvipng [options] [filename] \-
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+This program makes \s-1PNG\s0 and/or \s-1GIF\s0 graphics from \s-1DVI\s0 files as obtained
+from TeX and its relatives.
+.PP
+If \s-1GIF\s0 support is enabled, \s-1GIF\s0 output is chosen by using the
+\&\fBdvigif\fR binary or with the \fB\-\-gif\fR option.
+.PP
+The benefits of \fBdvipng\fR/\fBdvigif\fR include
+.IP "\(bu" 4
+Speed. It is a very fast bitmap-rendering code for \s-1DVI\s0 files, which
+makes it suitable for generating large amounts of images on-the-fly,
+as needed in preview-latex, WeBWorK and others.
+.IP "\(bu" 4
+It does not read the postamble, so it can be started before TeX
+finishes. There is a \fB\-\-follow\fR switch that makes dvipng wait at
+end-of-file for further output, unless it finds the \s-1POST\s0 marker that
+indicates the end of the \s-1DVI\s0.
+.IP "\(bu" 4
+Interactive query of options. dvipng can read options interactively
+through stdin, and all options are usable. It is even possible to change
+the input file through this interface.
+.IP "\(bu" 4
+Supports \s-1PK\s0, \s-1VF\s0, PostScript Type1, and TrueType fonts, subfonts (i.e.,
+as used in CJK-LaTeX), color specials, and inclusion of PostScript,
+\&\s-1PNG\s0, \s-1JPEG\s0 or \s-1GIF\s0 images.
+.IP "\(bu" 4
+and more...
+.SH "OPTIONS"
+.IX Header "OPTIONS"
+Many of the parameterless options listed here can be turned off by
+suffixing the option with a zero (\fB0\fR); for instance, to turn off
+page reversal, use \fB\-r0\fR. Such options are marked with a trailing
+\&\fB*\fR.
+.IP "\fB\-\fR" 4
+.IX Item "-"
+Read additional options from standard input after processing the command
+line.
+.IP "\fB\-\-help\fR" 4
+.IX Item "--help"
+Print a usage message and exit.
+.IP "\fB\-\-version\fR" 4
+.IX Item "--version"
+Print the version number and exit.
+.IP "\fB\-bd\fR \fInum\fR" 4
+.IX Item "-bd num"
+.PD 0
+.IP "\fB\-bd\fR \fIcolor_spec\fR" 4
+.IX Item "-bd color_spec"
+.IP "\fB\-bd '\fR\fInum\fR\fB \fR\fIcolor_spec\fR\fB'\fR" 4
+.IX Item "-bd 'num color_spec'"
+.PD
+Set the pixel width of the transparent border (default 0). Using this
+option will make the image edges transparent, but it only affects pixels
+with the background color. Giving a \fIcolor_spec\fR will set the
+fallback color, to be used in viewers that cannot handle transparency
+(the default is the background color). The color spec should be in
+TeX color \especial syntax, e.g., 'rgb 1.0 0.0 0.0'. Setting the
+fallback color makes the default border width 1 px.
+.IP "\fB\-\-bdpi\fR \fInum\fR" 4
+.IX Item "--bdpi num"
+This option only has an effect when using bitmapped (\s-1PK\s0) fonts. The
+option sets the base (Metafont) resolution, both horizontal and
+vertical, to \fInum\fR dpi (dots per inch). This option is necessary
+when manually selecting Metafont mode with the \-\-mode option (see
+below).
+.IP "\fB\-bg\fR \fIcolor_spec\fR" 4
+.IX Item "-bg color_spec"
+Choose background color for the images. This option will be ignored if
+there is a background color \especial in the \s-1DVI\s0. The color spec should
+be in TeX color \especial syntax, e.g., 'rgb 1.0 0.0 0.0'. You can
+also specify 'Transparent' or 'transparent' which will give you a
+transparent background with the normal background as a fallback color. A
+capitalized 'Transparent' will give a full-alpha transparency, while an
+all-lowercase 'transparent' will give a simple fully transparent
+background with non-transparent antialiased pixels. The latter would be
+suitable for viewers who cannot cope with a true alpha channel. \s-1GIF\s0
+images do not support full alpha transparency, so in case of \s-1GIF\s0 output,
+both variants will use the latter behaviour.
+.IP "\fB\-d\fR \fInum\fR" 4
+.IX Item "-d num"
+Set the debug flags, showing what dvipng (thinks it) is doing. This will
+work unless dvipng has been compiled without the \f(CW\*(C`DEBUG\*(C'\fR option
+(not recommended). Set the flags as you need them, use \fB\-d \-1\fR as
+the first option for maximum output.
+.IP "\fB\-D\fR \fInum\fR" 4
+.IX Item "-D num"
+Set the output resolution, both horizontal and vertical, to \fInum\fR
+dpi (dots per inch).
+.Sp
+One may want to adjust this to fit a certain text font size (e.g., on
+a web page), and for a text font height of \fIfont_px\fR pixels (in
+Mozilla) the correct formula is
+.Sp
+.Vb 1
+\& <dpi> = <font_px> * 72.27 / 10 [px * TeXpt/in / TeXpt]
+.Ve
+.Sp
+The last division by ten is due to the standard font height 10pt in
+your document, if you use 12pt, divide by 12. Unfortunately, some
+proprietary browsers have font height in pt (points), not pixels. You
+have to rescale that to pixels, using the screen resolution (default
+is usually 96 dpi) which means the formula is
+.Sp
+.Vb 1
+\& <font_px> = <font_pt> * 96 / 72 [pt * px/in / (pt/in)]
+.Ve
+.Sp
+On some high-res screens, the value is instead 120 dpi. Good luck!
+.IP "\fB\-\-depth*\fR" 4
+.IX Item "--depth*"
+Report the depth of the image. This only works reliably when the
+LaTeX style \fIpreview.sty\fR from preview-latex is used with
+the \fBactive\fR option. It reports the number of pixels from the
+bottom of the image to the baseline of the image. This can be used for
+vertical positioning of the image in, e.g., web documents, where one
+would use (Cascading StyleSheets 1)
+.Sp
+.Vb 1
+\& <IMG SRC="<filename.png>" STYLE="vertical\-align: \-<depth>px">
+.Ve
+.Sp
+The depth is a negative offset in this case, so the minus sign is
+necessary, and the unit is pixels (px).
+.IP "\fB\-\-dvinum*\fR" 4
+.IX Item "--dvinum*"
+Set this option to make the output page number be the TeX page
+numbers rather than the physical page number. See the \fB\-o\fR switch.
+.IP "\fB\-fg\fR \fIcolor_spec\fR" 4
+.IX Item "-fg color_spec"
+Choose foreground color for the images. This option will be ignored if
+there is a foreground color \especial in the \s-1DVI\s0. The color spec should
+be in TeX color \especial syntax, e.g., 'rgb 1.0 0.0 0.0'.
+.IP "\fB\-\-follow*\fR" 4
+.IX Item "--follow*"
+Wait for data at end-of-file. One of the benefits of dvipng is that it
+does not read the postamble, so it can be started before TeX
+finishes. This switch makes dvipng wait at end-of-file for further
+output, unless it finds the \s-1POST\s0 marker that indicates the end of the
+\&\s-1DVI\s0. This is similar to \fBtail \-f\fR but for DVI-to-PNG conversion.
+.IP "\fB\-\-freetype*\fR" 4
+.IX Item "--freetype*"
+Enable/disable FreeType font rendering (default on). This option is
+available if the FreeType2 font library was present at compilation time.
+If this is the case, dvipng will have direct support for PostScript
+Type1 and TrueType fonts internally, rather than using \fBgsftopk\fR
+for rendering the fonts. If you have PostScript versions of Computer
+Modern installed, there will be no need to generate bitmapped (\s-1PK\s0)
+variants on disk of these. Then, you can render images at different (and
+unusual) resolutions without cluttering the disk with lots of bitmapped
+fonts. Note that if you have both FreeType and T1lib on your system,
+FreeType will be preferred by dvipng. If you for some reason would want
+to use T1lib rendering, use this option.
+.IP "\fB\-\-gamma\fR \fInum\fR" 4
+.IX Item "--gamma num"
+Control the interpolation of colors in the greyscale anti-aliasing
+color palette. Default value is 1.0. For 0 < \fInum\fR < 1, the
+fonts will be lighter (more like the background), and for \fInum\fR >
+1, the fonts will be darker (more like the foreground).
+.IP "\fB\-\-gif*\fR" 4
+.IX Item "--gif*"
+The images are output in the \s-1GIF\s0 format, if \s-1GIF\s0 support is enabled.
+This is the default for the \fBdvigif\fR binary, which only will be
+available when \s-1GIF\s0 support is enabled. \s-1GIF\s0 images are palette images
+(see the \fB\-\-palette\fR option) and does not support true alpha
+channels (see the \fB\-\-bg\fR option). See also the \fB\-\-png\fR
+option.
+.IP "\fB\-\-height*\fR" 4
+.IX Item "--height*"
+Report the height of the image. This only works reliably when the
+LaTeX style \fIpreview.sty\fR from preview-latex is used with
+the \fBactive\fR option. It reports the number of pixels from the top
+of the image to the baseline of the image. The total height of the
+image is obtained as the sum of the values reported from
+\&\fB\-\-height\fR and \fB\-\-depth\fR.
+.IP "\fB\-l [=]\fR\fInum\fR" 4
+.IX Item "-l [=]num"
+The last page printed will be the first one numbered \fInum\fR. Default
+is the last page in the document. If \fInum\fR is prefixed by an equals
+sign, then it (and the argument to the \fB\-p\fR option, if specified)
+is treated as a physical (absolute) page number, rather than a value to
+compare with the TeX \fB\ecount0\fR values stored in the \s-1DVI\s0 file.
+Thus, using \fB\-l =9\fR will end with the ninth page of the document,
+no matter what the pages are actually numbered.
+.IP "\fB\-\-mode\fR \fImode\fR" 4
+.IX Item "--mode mode"
+This option only has an effect when using bitmapped (\s-1PK\s0) fonts. Use
+\&\fImode\fR as the Metafont device name for the \s-1PK\s0 fonts (both for path
+searching and font generation). This needs to be augmented with the base
+device resolution, given with the \fB\-\-bdpi\fR option. See the file
+<\fBftp://ftp.tug.org/tex/modes.mf\fR> for a list of resolutions and mode
+names for most devices.
+.IP "\fB\-M*\fR" 4
+.IX Item "-M*"
+This option only has an effect when using bitmapped (\s-1PK\s0) fonts. It turns
+off automatic \s-1PK\s0 font generation (\fImktexpk\fR).
+.IP "\fB\-\-nogs*\fR" 4
+.IX Item "--nogs*"
+This switch prohibits the internal call to GhostScript for displaying
+PostScript specials. \fB\-\-nogs0\fR turns the call back on.
+.IP "\fB\-\-nogssafer*\fR" 4
+.IX Item "--nogssafer*"
+Normally, if GhostScript is used to render PostScript specials, the
+GhostScript interpreter is run with the option \fB\-dSAFER\fR. The
+\&\fB\-\-nogssafer\fR option runs GhostScript without \fB\-dSAFER\fR. The
+\&\fB\-dSAFER\fR option in Ghostscript disables PostScript operators such
+as deletefile, to prevent possibly malicious PostScript programs from
+having any effect.
+.IP "\fB\-\-norawps*\fR" 4
+.IX Item "--norawps*"
+Some packages generate raw PostScript specials, even non-rendering such
+specials. This switch turns off the internal call to GhostScript
+intended to display these raw PostScript specials. \fB\-\-norawps0\fR
+turns the call back on.
+.IP "\fB\-o\fR \fIname\fR" 4
+.IX Item "-o name"
+Send output to the file \fIname\fR. A single occurrence of \fB\f(CB%d\fB\fR or
+\&\fB\f(CB%01d\fB\fR, ..., \fB\f(CB%09d\fB\fR will be exchanged for the physical
+page number (this can be changed, see the \fB\-\-dvinum\fR switch). The
+default output filename is \fIfile\fR\fB\f(CB%d\fB.png\fR where the input \s-1DVI\s0
+file was \fIfile\fR\fB.dvi\fR.
+.IP "\fB\-O\fR \fIx\-offset\fR\fB,\fR\fIy\-offset\fR" 4
+.IX Item "-O x-offset,y-offset"
+Move the origin by \fIx\-offset\fR,\fIy\-offset\fR, a comma-separated
+pair of dimensions such as \fB.1in,\-.3cm\fR.
+The origin of the page is shifted from the default position
+(of one inch down, one inch to the right from the upper left corner of
+the paper) by this amount.
+.IP "\fB\-p [=]\fR\fInum\fR" 4
+.IX Item "-p [=]num"
+The first page printed will be the first one numbered \fInum\fR. Default
+is the first page in the document. If \fInum\fR is prefixed by an
+equals sign, then it (and the argument to the \fB\-l\fR option, if
+specified) is treated as a physical (absolute) page number, rather than
+a value to compare with the TeX \fB\ecount0\fR values stored in the
+\&\s-1DVI\s0 file. Thus, using \fB\-p =3\fR will start with the third page of
+the document, no matter what the pages are actually numbered.
+.IP "\fB\-\-palette*\fR" 4
+.IX Item "--palette*"
+When an external image is included, \fBdvipng\fR will automatically
+switch to truecolor mode, to avoid unnecessary delay and quality
+reduction, and enable the \s-1EPS\s0 translator to draw on a transparent
+background and outside of the boundingbox. This switch will force
+palette (256\-color) output and make \fBdvipng\fR revert to opaque
+clipped image inclusion. This will also override the \fB\-\-truecolor\fR
+switch if present.
+.IP "\fB\-\-picky*\fR" 4
+.IX Item "--picky*"
+No images are output when a warning occurs. Normally, dvipng will
+output an image in spite of a warning, but there may be something
+missing in this image. One reason to use this option would be if you
+have a more complete but slower fallback converter. Mainly, this is
+useful for failed figure inclusion and unknown \especial occurrences,
+but warnings will also occur for missing or unknown color specs and
+missing \s-1PK\s0 fonts.
+.IP "\fB\-\-png*\fR" 4
+.IX Item "--png*"
+The images are output in the \s-1PNG\s0 format. This is the default for the
+\&\fBdvipng\fR binary. See also the \fB\-\-gif\fR option.
+.IP "\fB\-pp\fR \fIfirstpage\fR\fB\-\fR\fIlastpage\fR" 4
+.IX Item "-pp firstpage-lastpage"
+Print pages \fIfirstpage\fR through \fIlastpage\fR; but not quite
+equivalent to \fB\-p\fR \fIfirstpage\fR \fB\-l\fR \fIlastpage\fR. For example,
+when rendering a book, there may be several instances of a page in the
+\&\s-1DVI\s0 file (one in \f(CW\*(C`\efrontmatter\*(C'\fR, one in \f(CW\*(C`\emainmatter\*(C'\fR, and one
+in \f(CW\*(C`\ebackmatter\*(C'\fR). In case of several pages matching, \fB\-pp\fR
+\&\fIfirstpage\fR\fB\-\fR\fIlastpage\fR will render \fIall\fR pages that
+matches the specified range, while \fB\-p\fR \fIfirstpage\fR \fB\-l\fR
+\&\fIlastpage\fR will render the pages from the \fIfirst\fR occurrence
+of \fIfirstpage\fR to the \fIfirst\fR occurrence of \fIlastpage\fR.
+This is the (undocumented) behaviour of dvips. In dvipng you can give
+both kinds of options, in which case you get all pages that matches the
+range in \fB\-pp\fR between the pages from \fB\-p\fR to \fB\-l\fR. Also
+multiple \fB\-pp\fR options accumulate, unlike \fB\-p\fR and \fB\-l\fR.
+The \fB\-\fR separator can also be \fB:\fR. Note that \fB\-pp \-1\fR
+will be interpreted as \*(L"all pages up to and including 1\*(R", if you want a
+page numbered \-1 (only the table of contents, say) put \fB\-pp \-1\-\-1\fR,
+or more readable, \fB\-pp \-1:\-1\fR.
+.IP "\fB\-q*\fR" 4
+.IX Item "-q*"
+Run quietly. Don't chatter about pages converted, etc. to standard
+output; report no warnings (only errors) to standard error.
+.IP "\fB\-Q\fR \fInum\fR" 4
+.IX Item "-Q num"
+Set the quality to \fInum\fR. That is, choose the number of antialiasing
+levels for bitmapped fonts (\s-1PK\s0) and fonts rendered using T1lib, to be
+\&\fInum\fR*\fInum\fR+1. The default value is 4 which gives 17 levels of
+antialiasing for antialiased fonts from these two. If FreeType is
+available, its rendering is unaffected by this option.
+.IP "\fB\-r*\fR" 4
+.IX Item "-r*"
+Toggle output of pages in reverse/forward order. By default, the first
+page in the \s-1DVI\s0 is output first.
+.IP "\fB\-\-strict*\fR" 4
+.IX Item "--strict*"
+The program exits when a warning occurs. Normally, dvipng will output
+an image in spite of a warning, but there may be something missing in
+this image. One reason to use this option would be if you have a more
+complete but slower fallback converter. See the \fB\-\-picky\fR option
+above for a list of when warnings occur.
+.IP "\fB\-T\fR \fIimage_size\fR" 4
+.IX Item "-T image_size"
+Set the image size to \fIimage_size\fR which can be either of
+\&\fBbbox\fR, \fBtight\fR, or a comma-separated pair of dimensions
+\&\fIhsize\fR,\fIvsize\fR such as \fB.1in,.3cm\fR. The default is
+\&\fBbbox\fR which produces a \s-1PNG\s0 that includes all ink put on the page
+and in addition the \s-1DVI\s0 origin, located 1in from the top and 1in from
+the left edge of the paper. This usually gives whitespace above and to
+the left in the produced image. The value \fBtight\fR will make dvipng
+only include all ink put on the page, producing neat images.
+.IP "\fB\-\-t1lib*\fR" 4
+.IX Item "--t1lib*"
+Enable T1lib font rendering (default on). This option is available if
+the T1lib font library was present at compilation time. If this is the
+case, dvipng will have direct support for PostScript Type1 fonts
+internally, rather than using \fBgsftopk\fR for rendering the fonts. If
+you have PostScript versions of Computer Modern installed, there will be
+no need to generate bitmapped variants on disk of these. Then, you can
+render images at different (and unusual) resolutions without cluttering
+the disk with lots of bitmapped fonts. Note that if you have both
+FreeType and T1lib on your system, FreeType will be preferred by dvipng,
+and if you for some reason rather want to use T1lib, give the option
+\&\fB\-\-freetype0\fR (see above).
+.IP "\fB\-\-truecolor*\fR" 4
+.IX Item "--truecolor*"
+This will make \fBdvipng\fR generate truecolor output. Note that
+truecolor output is automatic if you include an external image in your
+\&\s-1DVI\s0, e.g., via a PostScript special (i.e., the \fBgraphics\fR or
+\&\fBgraphicx\fR package). This switch is overridden by the
+\&\fB\-\-palette\fR switch.
+.IP "\fB\-v*\fR" 4
+.IX Item "-v*"
+Enable verbose operation. This will currently indicate what fonts is
+used, in addition to the usual output.
+.IP "\fB\-\-width*\fR" 4
+.IX Item "--width*"
+Report the width of the image. See also \fB\-\-height\fR and
+\&\fB\-\-depth\fR.
+.IP "\fB\-x\fR \fInum\fR" 4
+.IX Item "-x num"
+This option is deprecated; it should not be used. It is much better to
+select the output resolution directly with the \fB\-D\fR option. This
+option sets the magnification ratio to \fInum\fR/1000 and
+overrides the magnification specified in the \s-1DVI\s0 file. Must be between
+10 and 100000. It is recommended that you use standard magstep values
+(1095, 1200, 1440, 1728, 2074, 2488, 2986, and so on) to help reduce the
+total number of \s-1PK\s0 files generated. \fInum\fR may be a real number, not
+an integer, for increased precision.
+.IP "\fB\-z\fR \fInum\fR" 4
+.IX Item "-z num"
+Set the \s-1PNG\s0 compression level to \fInum\fR. This option is enabled if
+your \fBlibgd\fR is new enough. The default compression level is 1,
+which selects maximum speed at the price of slightly larger PNGs. For an
+older \fBlibgd\fR, the hard-soldered value 5 is used. The include file
+\&\fBpng.h\fR says
+\&\*(L"Currently, valid values range from 0 \- 9, corresponding directly to
+the zlib compression levels 0 \- 9 (0 \- no compression, 9 \- \*(R"maximal\*(L"
+compression). Note that tests have shown that zlib compression levels
+3\-6 usually perform as well as level 9 for \s-1PNG\s0 images, and do
+considerably fewer calculations. In the future, these values may not
+correspond directly to the zlib compression levels.\*(R"
+.SH "NOTES"
+.IX Header "NOTES"
+The full manual is accessible in info format, on most systems by typing
+.PP
+.Vb 1
+\& info dvipng
+.Ve
+.SH "COPYRIGHT"
+.IX Header "COPYRIGHT"
+This program is released under the \s-1GNU\s0 Lesser General Public License
+version 3, see the \s-1COPYING\s0 file in the dvipng distribution or
+<\fBhttp://www.gnu.org/licenses/gpl.html\fR>.
+.PP
+Copyright (c) 2002\-2010 Jan-AAke Larsson