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1

Oh, do not worry. That is a never-ending color management horror. 1 I recommend you to use the following settings on all Photoshop instances you using (and also in all Adobe programs) In Edit > Color Settings chose those two profiles: RGB: Adobe RGB (1998) CMYK: Coated GRACoL 2006 (ISO 12647-2:2004) Management Policies should be all "Convert to xxxx" ...


2

CIE Lab is hard to wrap the wits around, because it defines a color space that includes such things as, for example, a theoretical fully-saturated yellow at 0 luminosity, which is perceptually indistinguishable from black, all the way to (e.g.) bright blue at 100% luminosity, which is indistinguishable from white. From that, once you get the (esoteric, to be ...


3

The subject is a bit challenging*. The short answer is: You look up the image profile, which contains the mapping to what it should look like in a known reference space. However this look-up tells you what its intended to look like, not what it originally was. So if you want to measure the values you need to have an untainted source. Basically that ...



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