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Have a need to set R, G and B values at a selected point . . .

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In astro imaging, I have a need to . . .

1/ Define or select a specific point on the background sky and

2/ Adjust the RGB values at that point so that they are equal, i.e., the sky is neutral with no color caste.

I have found how to have the values of R, G and B for a point under the mouse displayed but no way

to adjust the 3 individual channels to have them equalized.

Is this possible?

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Windows 10, Affinity Photo 1.9.2 Designer 1.9.2 and Publisher 1.9.2 (mainly Photo), now ex-Adobe CC

CPU: AMD A6-3670. RAM: 16 GB DDR3 @ 666MHz, Graphics: 2047MB NVIDIA GeForce GT 630

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