RE>
</TD>
</TR>
</TABLE>
<p>

Read image in PGM (Portable Gray Map) format.  Image geometry is
inferred from the header, so `<font color="#82140F"><code>.rows.</code></font>' and `<font color="#82140F"><code>.cols</code></font>' parameters
are not given.  Both ascii and binary PGM formats are supported (that
is, files with magic characters of P2 and P5).
<p>
<b>NOTE</b> that there are many image formats and Gri doesn't try to
deal with them all.  The idea is to use another program to convert
images to a fil