Wb in color calibration

[Jardiceeek]

How can i set direct white balance in temperature and tint in color calibration module?

[rvietor]

You can’t. The reason for that is a bit complex, but boils down to: changing tint causes non-linear hue shifts, depending on the temperature. And when you need “tint”, the illuminant doesn’t correspond to a source with a defined temperature…

In practice, if you have an illuminant (light source) which corresponds to daylight or black body radiation, you can change the temperature, and you don’t need the tint control.
Otherwise, you get hue and chroma controls, which allow full correction (for single-illuminant situations). No temperature, as the notion doesn’t make sense for such illuminants.

[priort (Todd Prior)]

Supporting the comments by @rvietor it is very well explained here what the function and application of the module are intended to do as opposed to using a simple wb…

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…

It also nicely explains when and why you will see “invalid” and also when you will see custom and how that plays with the controls…

[Terry (Terry Pinfold)]

As others have said, you can’t in this module. If you really want to do that then disable CC module and set the white balance in the WB module.