Maybe this can help:
Hallo @s7habo
Thanks for the link. However, I am not concerned with the very last precision here. Look how different the displays are:
Here are the two views of the same image:
Linear histogramm
Logarithmic histogramm
Especially in the lights, the difference is serious.
Which one can you use as a guide when you want to adjust the white balance?
It depends on the precision of your photo.
If you have not changed anything else and your photo has sRBG color space, by default GIMP uses internal sRGB color space with perceptual gamma.
Accordingly, you use the same for curves. Histogram display in the curves only show you how the histogram is interpreted. In this case logarithmic makes more sense because the color space is also perceptual.
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Hallo @s7habo
I am always amazed at how precisely and understandably you can explain even complicated issues.
I feel very blessed by your explanations.
Do I understand correctly that in the case of normal sRGB photos it is always better to use the logarithmic histogram?
And: what exactly does Auto Input Level (in Adujst Color Levesl) do? Can you do it manually in about the same way?
Automatic white balance. This is the same function as here:
Yes. Use three color pickers each for shadows, medium gray and highlights:
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