Roger,
Roger Breton schrieb:
I've seen profiles with S-shaped input tables for the a* and b* channels of the B2A luts (I don't remember exactly, but I think these were profiles made by ProfileMaker). This results in higher resolution for low-chromatic colors, and a lower resolution for highly chromatic colors (many/most of them are usually out-of-gamut anyway). Argyll profiles are apparently not built in this way.that table wastes 70% or so of the space in colors that are either nonexistent or out of gamut.
You wonder why couldn't there be some scaling factor that allows making intelligent use of the encoding space.
Actually it is not 17^3, but 17^4 for the A2B tables, since CMYK has 4 channels.Most CMYK profiles I seen only have 17x17x17
Sure, doubling the resolution increases the CMYK A2B CLUT by a factor of 16=2^4.I was once told that increasing the grid resolution would create monster profiles?
A brief look at the profout.c reveals that -qu implies 23 A2B CLUT grid points (for CMYK), and 45 B2A grid points. But I'm not sure whether you'll have enough patience for -qu :-)Please excuse my ignorance, but you mean I could create such profiles with argyll? 41 grid points both ways?
Regards, Gerhard
