Section: User Commands (1)
Updated: 4 November 2014
eqn2graph - convert an EQN equation into a cropped image
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
have the .EQ/.EN preamble that normally precedes it within
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
will produce a black-on-white graphic; newer ones may produce a
By specifying command-line options to be passed to
you can give it a border, force the background transparent, set the
image's pixel density, or perform other useful transformations.
This program uses
and the ImageMagick
These programs must be installed on your system and accessible on your
in the `unsafe' mode enabling the PIC macro
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
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
searches the environment variables
(in that order).
Otherwise, temporary files will be created in
Due to changes in the behavior of ImageMagick
that are both forward and backward-incompatible,
mismatches between your
versions may produce zero-sized or untrimmed output images.
For this version of
you will need a version of
that supports the
option; older versions of
which no longer has trimming behavior.
Eric S. Raymond <email@example.com
This documentation is released to the public domain.