1.3.16 (from Debian testing) appears to be mangling a 1bpp paletted colour image that worked fine with older (<=1.3.12) versions. It appears to be a stretching problem (i.e. wrong bit depth being read).
Image being mangled
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Screenshot of "display p.png": 1.3.16 on the left, 1.3.12 on the right.
This is the same bug as #3554897
The problem was that sub-8-bit PNG pixels were getting unpacked twice, once
by libpng (via png_set_packing)
and again by the switch statement around line 2500 in coders/png.c. I have
checked in a simple fix to the mercurial repository.
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