An ICC profile (or 3DL, etc. - formats abound) is little more than a color transformation matrix. While the ones baked into C1 are about the best in the business, it would be amazing if the implementation were tweaked such that profiles become associated with layers vs. being global. Obviously one still has to be associated with the base image (just like a 0 exposure balance exists for all layers by default), but additional higher order tweaks become super powerful for a variety of workflows. THE most powerful way of reproducing color is to normalize the input -- say, using a ColorChecker whose profile is associated with the base image [LAYER] -- and then applying a creative profile which drives the color a different direction. There are a variety of lower-fidelity ways of doing this today in C1, but they are all workarounds for a fundamental capability which - by simply re-tagging where the processing happens - could open up whole new workflows for photographers and retouchers. My personal use case is to use inversely-created profiles for sunrise and sunset to apply as a creative style to normalized photos. There are frustrating ways of doing this today by combining profiles, but if they could simply be tagged to layers it would be vastly faster, simpler, more repeatable, etc.
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