The white balance values show very weird behaviour. I am using a Nikon D750 with automatic white balance. The behaviour is as follows:
By default, the “As shot” white balance settings of Photolab is always 5299 K and -1 tint. No matter, what setting the camera chose, it is always this setting, when I import pictures into Photolab, which I find already a bit weird. However, these are not the “real” settings, that seem to be applied under the hood at Photolab, as the following behaviour shows:
If I switch from the “As shot” setting to another setting, for example to “Daylight”, it will correctly change to 5200 K and 0 tint. Interestingly though, if I switch now back to “As shot”, it will display me completely different values than before, for example 5370 K and +1 tint. These values seem to be actually the correct values, that should have been displayed already before. The appearance of the image does not change compared to 1, it is only a display error of the white balance values.
It behaves similarly, when I double click on either the temperature or the tint value to reset the default values. If I double click on temperature, the temperature value jumps to 5400 K (this seems to be the default value). Surprisingly, also the tint value will jump as well; it will jump to the correct value of +1 tint. The same happens in the opposite direction, If I double click on tint, it jumps to 0 tint, and the temperature jumps to 5370 K. Normally, the slider that I am not double clicking on should not change.
The worst thing happens, if I adjust the slider values directly from the “As shot” state. Under the hood, Photolab seems to apply the correct white balance values, which are in this example 5370 K and +1 tint. However, on the sliders, it displays me 5299 K and -1 tint. If I move the tint slider now from -1 to 0, the image is supposed to become more pinkish. In reality however, it becomes greener!!! I think, what is happening, is that the true start value is actually +1 (even though -1 is displayed), and even though I am moving the slider one value right to 0 (pinker), from the perspective of the true value +1, the slider was moved left (greener) to 0.
It is a bit complicated to describe, I hope the problem became clear. I have this problem already since Photolab 3, but I never fully understood the problem until now. I am on the newest version 4.3.1 on Windows 10. I can recreate this problem on any image from my Nikon D750. I just checked, and the problem does not exist on my Nikon D90!! I also noticed that on the Nikon D90 I have many more white balance presets to choose from, the D750 only displays me very few options!