I am looking for a good file format to save scanned RGBI images, that is like a RGBA file but an infrared instead of a transparency byte for each pixel. Sane once (and maybe still) transfered RGBI info but I am not sure it was ever written to a file.
An additional requirement is that the file must specify the resolution it was scanned at. The best I can up with is the SGI RGB format. It includes any number of channels, does not explicitly declare resolution but that could be written in the NAME field. I mildly dislike the consecutive rather than interlaced writing of sample values but otherwise it looks good. I prefer to stick to (or close to) some existing format, preferably one with an open source library for reading/writing. Would appreciate comments or better suggestions. Regards, Enno
