It could be worth trying to copy the colors of picture without filter to a picture taken with ND-filter using the Color mapping: http://www.darktable.org/2013/04/color-mapping/
On 07/12/2016 06:27 PM, Stefan Klinger wrote: > Hi, I have two questions regarding optical Filters: > > (1) My ND-Filter creates a slight color cast, which I would like to > undo semi-automatically: The recipe I have in mind would be to take > two pictures of a white surface, once with and once without the > optical filter in place. Using the same light source and camera WB, > but different exposure to compensate for brightness, the difference > between the two pictures should express the unwanted color cast. Can > DT use this to calculate an inverse filter? > > (2) Similar Problem, in the other direction: Sometimes I see landscape > through sunglasses, and it looks nicer than without. Can I dell DT to > replicate the effect of my sunglasses? The recipe would be similar as > above: Take two shots of a defined white surface, once directly, once > through the glasses. The difference between the two pictures should > be used to derive a filter function that adds the “sunglasses effect” > in post processing. > > Thank you > Stefan > > -- python programming - mail server - photo - video - https://sebix.at cryptographic key at https://sebix.at/DC9B463B.asc and on public keyservers
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