The “K” in CMYK is understood to be the key since in four-color printing cyan, magenta, and yellow printing plates are aligned with the black plate which is the key. In other words the other colors are setup in relation to the black which is thus the "key" to the process.
http://www.youdesignit.com/answers/why-does-the-k-stand-for-black-in-cmyk
RGB vs SRGB
https://fstoppers.com/pictures/adobergb-vs-srgb-3167
additive and subtractive colors
https://cs.nyu.edu/courses/fall02/V22.0380-001/color_theory.htm
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