Colorcalibration

[Herbert_W]

Hi,

I have SDSS colorcalibrated RGB-frames (from THELI) with these factors:
Red 1.385
Green 1
Blue 0,65

In PixInsight > LRGBCombination > Channel Weights  is the highest possible number 1.

How can I use the factors from above for RGBCombination in PixInsight?

Several attempts (subtract 0.385 from G and B, divide by 2 to get numbers < 1, PixelMath; ...)  ended with a horrible colorcast.
I'm afraid, my math problem-solving abilities are not up to date ;-)

Thanks a lot for your help and best regards.

Herbert, Austria

[Philip de Louraille]

To keep your color *ratios*, you'll need to divide, not subtract.

Divide your R, G, and B values by the highest value you have so it will scale that to 1.
Your highest value is 1.385, so divide R, G, and B with that.

New values, kept to scale:
R = 1
G = 0.722
B = 0.469

[Herbert_W]

Hi Philip!

Thank you for your help!

Best regards
Herbert, Austria