Hi, I think you can solve both issues by creating a custom color profile for your camera with the filter/sunglasses, as in https://encrypted.pcode.nl/blog/2010/06/28/darktable-camera-color-profiling/
You will need a defined color target, a simple white surface is not enough. Cheers Michael -----Ursprüngliche Nachricht----- Von: Stefan Klinger [mailto:[email protected]] Gesendet: Dienstag, 12. Juli 2016 18:28 An: darktable-user Betreff: [darktable-user] replicate / invert optical filter 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 -- http://stefan-klinger.de o/X Send plain text messages only, not exceeding 32kB. /\/ \ ____________________________________________________________________________ darktable user mailing list to unsubscribe send a mail to [email protected] ____________________________________________________________________________ darktable user mailing list to unsubscribe send a mail to [email protected]
