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Saturation and hue

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I posted recently regarding colour level adjustment that is no longer available to me in my new HP Photosmart printer software. SAND33P kindly pointed me to colour plugins. I duly downloaded Tanel's Color Mixer, which appears will carry out the task I require admirably (I thank you).

I am fascinated to know, however, the reason for both RGB and ink colour (cyan, magenta and yellow) sliders, and how each set or both is/are used and in what contexts. Previously, if my photographic prints were automatically heavy in red, I would reduce the magenta and yellow in varying percentage points, for example, because only the printing ink colours were available to me.

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These posts (both by BoltBait) may further illuminate the relationship between RGB and CMYK:

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