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-.\" ========================================================================
-.\"
-.IX Title "DVIPNG 1"
-.TH DVIPNG 1 "2020-01-05" "dvipng 1.17" "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 "*" 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 "*" 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 "*" 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 "*" 4
-Supports \s-1PK, VF,\s0 PostScript Type1, and TrueType fonts, subfonts (i.e.,
-as used in CJK-LaTeX), color specials, and inclusion of PostScript,
-\&\s-1PNG, JPEG\s0 or \s-1GIF\s0 images.
-.IP "*" 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.
-One reason to disable FreeType font rendering would be to generate
-identical output on different platforms, since FreeType uses the native
-renderer and therefore can give slightly different output on each platform.
-.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), 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\-\-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\-2015, 2019 Jan-AAke Larsson