4 ==> Note: See http://www.floodgap.com/software/ppmascii/ on instructions on how to use ppmascii.
5 ==> The general use is to "pipe" the ppm image through the script, for example:
7 ==> tifftopnm image.tiff | ppmascii -invert
8 ==> convert image.png -colorspace Gray -colors 16 -antialias ppm:- | ppmascii -x2 -photo -winx=4
13 # vim:set ts=2 sw=2 et: