Nikolay Pokhilchenko wrote:
Hello, Graeme! For a long time as I start using the collink in gamut mapping mode, I want ask You a contrast optimizing feature - some kind of a gamut-depended "auto levels". In some cases the source gamut is exceeds the destination gamut only from top
For example take a look at http://www.colour.org/tc8-03/images/ski_pg/Ski_TC8-03_abs.tif test image. Whileperforming of conventional gamut mapping by collink, the output image is much more desaturated as it may be with contrast adjusting.
Hmm. I'm not sure this is really a good fit for gamut mapping. It seems to me that this is more like "exposure adjustment", and therefore falls outside what "collink" is intended to do. Argyll gamut mapping very deliberately bases it's neutral axis and white & black point adjustments on the source colorspace, on the assumption that any image within that colorspace has been adjusted appropriately with regard to these three attributes. Adjustingthese three attributes + general contrast is something that would need to be more heuristic, and I think would be better in a separate "auto image adjust" type
utility. cheers, Graeme Gill.