Hehe. I think I found my decoding problem. Those that didn't work are using 16bit per color not 24/32 ;-) Part of the pict header now obviously is (in that order): Bits per pixel (2 Byte) - I hope 32 or 16 are the only ones used in RSRs... Number of components (2byte) - 3: rgb, 4:rgba Bits per component (2 byte) - 8 or 5