Hi,In the context of my experiments with tiffgamut/icclink -G, I stumbled upon something I can't understand:
As Photoshop's "Reduce Noise" filter doesn't work with "one way profiles" (like many camera or scanner profiles), I had to convert my source image to another colorspace. To avoid clipping and quantisazion errors, I decided to use Adobes ProPhoto RGB and 16bpc data. I was very surprised to see differences between the results.
To verify this differences and preclude errors, I made a second test:I made a matrix profile based on ProPhoto RGB with the same primaries and whitepoint, but gamma 1 instead of 1.8.
I converted my source image to a) ProPhoto RGB b) my Gamma1-ProPhoto RGB in Photoshop, relative colorimetric, without BPC in both cases.I created gamut files with tiffgamut -ij from (a) and (b) and verified that the image gamuts are basically the same.
then I built two DLPs: icclink -qh -ip -cmt -dpp -G [a|b].gam [a|b].icc [target].icc [a|b]_link.icc and used them with cctiff: cctiff [a|b]_link.icc [a|b]_source.tif [a|b]_converted.tifI expected images a_converted.tif and b_converted.tif to be nearly identical, but they are very different (see screenshot).
What's going on? TIA, Klaus