Raw auto ca correction in hdrmerge

@CarVac and I currently are working on a library (librtprocess) which aimes to include some of the RawTherapee processing steps.

Today I started work to include raw ca correction from RT into librtprocess and use that in hdrmerge.
I still have to solve some issues, but it turned out to work really well. Soon, hdrmerge will be able to use raw auto ca correction!


:+1: for this!

On that line, it should also be possible to apply vignetting correction from LensFun, because it manipulates pixel values in the linear camera colorspace. Maybe an idea for the future…

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@Morgan_Hardwood posted a first result

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