There are different Colour Spaces. The most familiar in Photography are RGB and CMYK:
| RGB | CMYK | |
|---|---|---|
| Additive Colours Space | Substractive Colour Space | |
| Red, Green and Blue = White | Cyan, Magenta, Yellow and Black |
While all Colours in RGB-Mode are added to white if added, CMYK will be substracted to Black.
I don’t want to go too much in detail here. There is a nice, detailed article about it at Wikipedia
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