convert an EQN equation into a cropped image
see also :
pic2graph - grap2graph - eqn - groff - gs - convert
[ -unsafe ] [
-format fmt ]
add an example, a script, a trick and tips
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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
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.
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
Specify an output format; the
default is PNG (Portable Network Graphics). Any format that
convert(1) can emit is supported.
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.
The eqn(1) initialization file.
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
grap2graph , eqn , groff ,
gs , convert .
Eric S. Raymond