-filters.c # pod (excpet experimental)
+filters.c # pod (except experimental)
font.c # pod
gif.c # pod
image.c # pod
quant.c # comments, lots of changing code
+=====================
+Iolayer todo list:
+Format Read/Write
+gif: O O
+jpeg: X X
+png: X X
+raw: X X
+tiff: X X
+pnm: X X