EQN2GRAPH(1)               OpenBSD Reference Manual               EQN2GRAPH(1)



NAME
       eqn2graph - convert an EQN equation into a cropped image

SYNOPSIS
       eqn2graph [ -unsafe ] [ -format fmt ]

DESCRIPTION
       Reads an EQN equation (one line) as input; produces an image file (by
       default in Portable Network Graphics format) suitable for the Web as
       output.

       Your input EQN code should not have the .EQ/.EN preamble that that
       normally precedes it within groff(1) macros; nor do you need to have
       dollar-sign or other delimiters around the equation.

       The output image will be clipped to the smallest possible bounding box
       that contains all the black pixels.  Older versions of convert(1) will
       produce a black-on-white graphic; newer ones may produce a black-on-
       transparent graphic.  By specifying command-line options to be passed
       to convert(1) you can give it a border, force the background
       transparent, set the image's pixel density, or perform other useful
       transformations.

       This program uses eqn(1), groff(1), and the ImageMagick convert(1)
       program.  These programs must be installed on your system and
       accessible on your $PATH for eqn2graph to work.

OPTIONS
       -unsafe
              Run groff(1) in the `unsafe' mode enabling the PIC macro sh to
              execute arbitrary commands.  The default is to forbid this.

       -format fmt
              Specify an output format; the default is PNG (Portable Network
              Graphics).  Any format that convert(1) can emit is supported.

       Command-line switches and arguments not listed above are passed to
       convert(1).

FILES
       /usr/local/share/groff/1.21/tmac/eqnrc
              The eqn(1) initialization file.

ENVIRONMENT
       GROFF_TMPDIR
              The directory in which temporary files will be created.  If this
              is not set eqn2graph searches the environment variables TMPDIR,
              TMP, and TEMP (in that order).  Otherwise, temporary files will
              be created in /tmp.

BUGS
       Due to changes in the behavior of ImageMagick convert(1) that are both
       forward and backward-incompatible, mismatches between your eqn2graph
       and convert(1) versions may produce zero-sized or untrimmed output
       images.  For this version of eqn2graph you will need a version of
       convert(1) that supports the -trim option; older versions of eqn2graph
       used -crop 0x0, which no longer has trimming behavior.

SEE ALSO
       pic2graph(1), grap2graph(1), eqn(1), groff(1), gs(1), convert(1).

AUTHOR
       Eric S. Raymond <esr@thyrsus.com>.



Groff Version 1.21             31 December 2010                   EQN2GRAPH(1)
