Apparently PIL saves PGM internally as PPM unless you convert the image
to grayscale first. Add proper check for format to fix the issue
(perhaps to imtools save?).
Here's a test case I used to verify this behavior:
from Image import open
im = open('Lenna.png')
gim = im.convert('L')
gim.save('Lenna1.pgm')
im.save('Lenna2.pgm')
im.save('Lenna3.ppm')
--
Save to pgm actually saves to pnm
https://bugs.launchpad.net/bugs/472978
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