.\" $Id: eqn2graph.man,v 1.4 2003/10/28 07:46:23 wlemb Exp $
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.TH EQN2GRAPH @MAN1EXT@ "@MDATE@" "Groff Version @VERSION@"
.IX eqn2graph
.SH NAME
eqn2graph \- convert an EQN equation into a cropped image
.
.
.SH SYNOPSIS
.B eqn2graph
[
.B \-unsafe
]
[
.BI \-format\  fmt
]
.
.
.SH 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.
.P
Your input EQN code should \fInot\fR have the \&.EQ/.EN preamble that
that normally precedes it within 
.BR groff (@MAN1EXT@) 
macros; nor do you need to have dollar-sign or other delimiters
around the equation.
.P
The output image will be a black-on-white graphic clipped to the
smallest possible bounding box that contains all the black pixels.
By specifying command-line options to be passed to 
.BR convert (1)
you can give it a border, set the background transparent, set the
image's pixel density, or perform other useful transformations.
.P
This program uses 
.BR @g@eqn (@MAN1EXT@),
.BR groff (@MAN1EXT@),
and the ImageMagick 
.BR convert (1)
program.
These programs must be installed on your system and accessible on your
$PATH for \fBeqn2graph\fR to work.
.
.
.SH OPTIONS
.TP
.B \-unsafe
Run 
.BR groff (@MAN1EXT@)
in the `unsafe' mode enabling the PIC macro
.B sh
to execute arbitrary commands.
The default is to forbid this.
.TP
.BI \-format\  fmt
Specify an output format; the default is PNG (Portable Network Graphics).
Any format that
.BR convert (1)
can emit is supported.
.PP
Command-line switches and arguments not listed above are passed to
.BR convert (1).
.
.
.SH FILES
.Tp \w'\fB@MACRODIR@/eqnrc'u+2n
.B @MACRODIR@/eqnrc
The 
.BR @g@eqn (@MAN1EXT@)
initialization file.
.
.
.SH ENVIRONMENT
.TP
.B GROFF_TMPDIR
The directory in which temporary files will be created.
If this is not set
.B eqn2graph
searches the environment variables
.BR \%TMPDIR ,
.BR TMP ,
and
.B TEMP
(in that order).
Otherwise, temporary files will be created in
.BR /tmp .
.
.
.SH "SEE ALSO"
.BR pic2graph (@MAN1EXT@),
.BR grap2graph (@MAN1EXT@),
.BR @g@eqn (@MAN1EXT@),
.BR groff (@MAN1EXT@),
.BR gs (1),
.BR convert (1).
.
.
.SH AUTHOR
Eric S. Raymond <esr@thyrsus.com>.
.
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