A patch that solves this issue:
p...@vitamin:~/src/imagemagick-6.3.7.9.dfsg1$ diff -u coders/orig/pnm.c
coders/pnm.c
--- coders/orig/pnm.c 2007-12-08 01:13:40.000000000 +0100
+++ coders/pnm.c 2009-03-24 21:54:47.000000000 +0100
@@ -417,7 +417,7 @@
ThrowReaderException(CorruptImageError,"NegativeOrZeroImageSize");
if (max_value >= 65536)
ThrowReaderException(CorruptImageError,"ImproperImageHeader");
- for (image->depth=1; (1UL << image->depth) < max_value; image->depth++);
+ for (image->depth=1; (1UL << image->depth) <= max_value; image->depth++);
scale=(Quantum *) NULL;
if (image->storage_class == PseudoClass)
if (AllocateImageColormap(image,image->colors) == MagickFalse)
** Attachment added: "Solves the bug with PNM images with maxval 256"
http://launchpadlibrarian.net/24318346/pnm_fix.patch
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ImageMagick interprets PGM header incorrectly
https://bugs.launchpad.net/bugs/346474
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