White (dis)balance and Darktable

[sgotti (Simone Gotti)]

It’s explained in the manual
https://docs.darktable.org/usermanual/4.2/en/module-reference/processing-modules/color-calibration/

And in some threads:

Introducing color calibration module (formerly known as channel mixer rgb)

[Screenshot_20201109_024706] TL; DR : this is a full rewrite in clean unbounded RGB of the channel mixer in darktable. The old one had some computational mistakes in it, plus clipped RGB at 100%. This also introduces much requested normalization options, that will keep the sum of parameters to 1, trying to preserve – rougly – luminance (actually, perceptual luminance is much more than a simple sum of R + G + B, since it depends on hue, but… TL; DR). Ok. But it’s named color calibration becaus…

Color calibration for dummies (without the maths)

First, happy New Year ! Then, some people fried their brain trying to understand the new color calibration module in darktable. While this post is not meant to spare you a good read of the doc (you should try it some time, seriously, it’s simply the best. Tremendous guys working there, I called them the other day, had a great chat), this is what you need to know to use it while the information is brewing in your brain. What we expect This is your usual color checker shot using hot-shoe strobe…