geeqie fails to recognize some PPM images which are readable by both the
GIMP (gimp version 2.6.8-2) and pnmtopng (libnetpbm10 version
2:10.0-12.1).
As an example, I refer to the PPM image files attached to this report:
works.ppm displays correctly
fails.ppm unrecognized
The only formatting difference is that the former has an embedded
comment ("# CREATOR: The GIMP's PNM Filter Version 1.0"), while the
latter does not.
I believe that gtk or one of its associated libraries (perhaps
gdk_pixbuf?) may be at the root of the problem, since the unrecognized
file problem occurs when gtk2.0-0 version 2.18.9-2 is installed, yet
both images are displayed successfully when gtk2.0-0 version 2.18.6-1 is
installed. However I don't know enough about the internals of gtk, gdk
or geeqie to make a definitive statement.