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       eqn2graph - convert an EQN equation into a cropped image


       eqn2graph [ -unsafe ] [ -format fmt ]


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

       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

       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.


              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


              The eqn(1) initialization file.


              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.


       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.


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


       Eric S. Raymond <>.