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 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/share/groff/1.22.3/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).

AUTHORS

       Eric S. Raymond <esr@thyrsus.com>.  This documentation is released to the public domain.