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
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.
Run groff(1) in the `unsafe' mode enabling the PIC macro sh to
execute arbitrary commands. The default is to forbid this.
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 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.
This page is part of the groff (GNU troff) project. Information
about the project can be found at
⟨http://www.gnu.org/software/groff/⟩. If you have a bug report for
this manual page, see ⟨http://www.gnu.org/software/groff/⟩. This
page was obtained from the tarball groff-1.22.3.tar.gz fetched from
⟨ftp://ftp.gnu.org/gnu/groff/⟩ on 2016-10-04. If you discover any
rendering problems in this HTML version of the page, or you believe
there is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
Groff Version 1.22.3 4 November 2014 EQN2GRAPH(1)