I mainly photo birds, but only as an amateur. This means squeezing the best image from a poor shot of a tiny bird in the distance.
Shooting RAW and developing with darktable has given me great results over the last 7 or 8 years, however, I often noticed that the sky in the background was not a realistic blue. I put this down to the exposures being correct for the bird, not the sky.
Anyway, on a recent trip to Egypt I was snapping scenery, pyramids, temples - lots of beautiful, clear blue sky in the background. I was using a Canon R6 with an EFS 17-55mm lens. Mostly I used the Canon auto setting, but taking RAW images (note they always look super good in the R6 viewfinder, especially in darkened tombs!).
The embedded JPGs look pretty decent, but as always, darktable can pull out more detail and give more crispness and pop to the image. The first problem is to read the Canon RAW format .CR3 - I use the Adobe DNG Converter to convert to DNG format, which darktable can read.
I am now using darktable 3.4 so the Color Calibration module is available, but here is my problem. Setting WB to Camera Reference, CAT to CAT16, the sky often comes out a darkish blue no matter which illuminant I choose. Again it could just be the sky is underexposed but then how do I correct this? In the attached image it is tricky to create a mask for the sky and not get haloing around the statue. If you try to boost the blue in the calibration blue tab, then other parts of the image get overexposed. I guess a mask+ parametric approach could work, but thats a lot of work for several hundred images.
ER6_4832.dng (9.0 MB)
licensed as Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
One last point: in the Color Calibration section of the manual it says that “DNG RAW files are also ignored” does this mean the WB and input settings are ignored, and the DT defaults are the problem? If so, what options do I have for my converted DNG files as there is no assistance available from Canon.
Apologies in advance my lack of understanding means i phrased the question badly.