Ya its a bit of a fiddle to prepare the images. DT’s recent solution is nice because you can just for the most part place the grid and you can do it in the raw file…no tiff required as it is using an optimized channel mixer instance to bring the colors closer to the reference values from the applied WB and input profile settings…then you just use that as a preset for similar photos…does delta E calculations and identifies good and bad patches…
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