Improvments Local adjustments - Color Appearance Cam 16 and Log encoding

[Desmis]

Hello, and excuse my bad english.

This PR aims at both, simplification and performance improvement of " Local adjustments ", " Color appearance - Cam16 ".
Branch "lacam16"

These improvements affect the GUI - which is still to be improved (because it is complex due to the mix of Cam16, Jz codes and the possibility of Zcam).

But obviously the main improvements concern the algorithms. As a reminder on the vocabulary and some principles (use of log), they are close to " Filmic ", " Sigmoid ", " New colorimetry " in Darktable. On the substance, the principles (use of Lab, Cam, Brightness, etc.), they are different.
I also enriched the "masks" part.

For more information see issue #6653.

To summarize you can now:

• have settings that in "basic" mode should be suitable in a majority of cases (which does not mean "all cases")
• the possibility in Cam16 - which, let's remember, is advanced CAM (one can certainly say... "there is better"!), of : Sigmoid, Log encoding, Sigmoid + Log encoding, TRC (close to "abstract profile"), ...

I don't give by principle, any name to make a review, whether it is "code" or "algorithms", free to each one to express himself.

One can also tell me that :

• "LA" is complex (in basic mode ??) it's a bit true, but requires unlearning and relearning.
• using the "Full-image" mode is not intuitive...(if someone can improve the GUI!). Just select a choice...in a "Settings combobox", and offers in relation to "main" the possibilities of LA (deltaE, excluding spot, etc.).
• not many people are interested - see https://discuss.pixls.us/t/local-adjustments-color-appearance-cam16-improvments-sigmoid-q-log-encoding-q-mask/34377 0 responses on Pixls.us (and 1 positive review) out of 197 views, and 0 interventions from LA Color Appearance Cam16 – improvments Sigmoid Q, Log encoding Q, mask: branch lacam16 #6653. Why not?

I have also update rawpedia (in french)
https://rawpedia.rawtherapee.com/Local_Adjustments/fr#Utilisation_de_Cam16_et_des_fonctionnalit%C3%A9s_HDR
jacques

[Beep6581]

Entries should be deleted, not commented out.

[Beep6581]

You could use GENERAL_ENABLED instead of creating a new key.

[Desmis]

Hello @Beep6581
OK for delete instead of commented out.
For the new key, I want to keep the possibility of a third choice (possible in locallabtools2)

Jacques