Hi, feh uses Imlib2 to load/save the various image formats. I have verified that this bug is caused by Imlib2, not feh, so please report it to the Imlib2 devs.
perl -MImage::Imlib2 <<'EOF'
my $im = Image::Imlib2->load('foo.pbm');
$im->image_set_format('png');
$im->save('foo.png');
EOF
You'll see that foo.png shows the same broken rendering that you were
reporting for feh, even when viewing it with programs not using Imlib2.
Anyways, thanks for reporting the bug,
Daniel
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