Hi,

I suggest we deprecate the color transfer module for the upcoming 1.2 
release.

The reason is that this module does not come up to the quality standards 
of our other modules. This is evident if you apply a module and then 
zoom into the image. As the module produces NaNs one frequently gets a 
black screen and overall the results vary heavily depending on zoom 
level. Unfortunately there is no easy fix. The problem is the working 
principle and the way how color transfer is calculated and applied.

I suggest to keep the module in darktable in a "deprecate" state without 
GUI. Existing history stacks will still work. You can disable the module 
but you can not activate it on new images.

After 1.2 I will work on a new and improved "color mapping" module that 
has the same intention - transfer look and feel of a source image to a 
destination image.

Ulrich

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