chroma seems solved, yet hardcoded and not derived from values in the headers, this will be the next step to look where to find the correction values in the file
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Current color rendering in darktable. Looks promising.
Missing:
- Derive color correction from header or whitebalance metadata (still unclear)
- Stone color / overall color seems still off to me
- The Adobe DNG looks smoother so some deblocking is missing it seems
- Decoding artifacts still present in the form of black/white dotted areas (all comps) and colored stripes (come from comp3)
- Top looks smeared
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Could anyone with access to a HE* camera and a color target shoot a neutral grey patch for me? Or best multiple color patches that include neutral grey as well? Thanks a lot! @martinus
Practical requirements for the shot:
- HE* compression mode (obviously)
- Flat, even lighting — avoid specular on the target surface
- Keep the target reasonably large in frame so each patch spans several precincts
- Shoot at base ISO to minimise noise in the Cr/Cb channels
- Include a shot in HE (uncompressed or lossless) of the same target if your camera supports it — that would give us a direct before/after comparison of what the Nikon ICT does to the codec values, which is the most direct way to characterise the transform
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I am currently on the road, could you give an visual example of what you are looking for?
I can see what I can do. As I am traveling right now I don’t have the option of getting them right now, unfortunately.
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Awesome job!!
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I feel like Claude is my baby now, constantly telling it what not to do 
Add it to the instructions so it “remembers”.
it’s a bit hard when you’re juggling a few free ones but I’ll manage