from preamble:

"Change Set:		PNMReadWriter
Date:			15 October 2003
Author:			Javier Diaz Reinoso

I am a subclass of ImageReadWriter that decodes portable anymap file 
formats
(pbm, pgm, ppm and  pam) images.

I accept the #origin pragma for SE files as described in:
Algoritms For Image Processing And Computer Vision. J. R. Parker

Don't work with 2 bytes samples (16 bit grays, > 32 bits color, etc...),
pam files preliminary support.
"
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Javier Diaz-Reinoso
Web: http://homepage.mac.com/javier_diaz_r/