Hi All,

Is it possible to apply an image based mask?

I am trying to solve the vignetting/lens cast problem.  I thought it would be 
easy to use a calibration flat field image to apply a mask to the original, but 
I don't see anywhere in darktable where external masks are supported.

I've already tried using lensfun, and while I am able to calibrate TCA and 
distortion, the vignetting code isn't cross platform, and even if it were 
calibrating vignetting is tedious todo in every case, so just capturing the 
flat field for each image seems easier.

Sincerely yours,

Robin___________________________________________________________________________
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