Thanks for taking the time to report this bug and including a patch too.
I've tried recreating this on the Jackalope using package version
7:6.4.5.4.dfsg1-1ubuntu3 and was unable to. Looking at the source code
of imagemagick it seems to have change a bit too:
if (max_value >= 65536)
ThrowReaderException(CorruptImageError,"ImproperImageHeader");
for (depth=1; GetQuantumRange(depth) < max_value; depth++) ;
image->depth=depth;
if ((image_info->ping != MagickFalse) && (image_info->number_scenes != 0))
if (image->scene >= (image_info->scene+image_info->number_scenes-1))
Since you wrote the patch, do you think this might resolve the bug?
Thanks in advance.
** Changed in: imagemagick (Ubuntu)
Status: New => Incomplete
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ImageMagick interprets PGM header incorrectly
https://bugs.launchpad.net/bugs/346474
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