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I'm editing a back-lighted portrait. Sky backwards it's mostly overexposed, but some information was preserved on the upper left corner of the frame. I shooted on both JPG and RAW (canon's CR2)

This is the unedited jpg version (detail)

jpg image

This is the CR2 I'm working on (detail)

raw image

I'm changing the upper section of base tonal curve, not being able to achieve the smoothness of unedited jpg.

My goal is to get a blue to white smooth gradient.

I'm working on Darktable 2.0.6, Linux Ubuntu Studio 19.04, and the frame was shot on Canon 80D - Sigma ART 18-35mm 1.8f

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    Not really an answer, but I'd start by opening the .CR2 in Canon's Digital Photo Professional 4. It's a free download if you have a valid Canon serial number from your 80D. You'll need a Windows (virtual) machine to use it. When you open a .CR2 in DPP the default behaviour is to apply the in-camera settings at the time it was shot. You can then "go to school" by viewing what settings were applied by the camera to produce the in-camera generated JPEG. Although some things may have different labels/names between the two apps, you should be able to figure out what corresponds. – Michael C Jun 25 at 6:33
  • Thanks, Canon DPP it's not supported by wine, and I don't want to try a Windows emulator. But I will give it a try on a Windows computer and see if it helps. – Lisan Jun 25 at 23:07

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