EXCERPT page containing first few paragraphs. 2020-09-28 05:40:12
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UPDATE: Adobe issued a "V2 beta" patch. It fixes the issue.
The Adobe Camera Raw camera profile offers a number of choices. The 'Adobe Standard' profile is the one Adobe creates. The others are of unknown provenance (at least to this author).
For the Nikon D810, the 'Camera Standard' profile has a bug causing very harsh tonal transitions. The other profiles do not suffer from this defect. Avoid 'Camera Standard' until and unless this bug is fixed.
Shown below are actual pixels crops from several different profiles. The image was converted into 16 bit TIF using the ProPhotoRGB color space. Since the Portrait and AdobeStandard profiles are lower in contrast, Contrast = +30 has been added for them—even so, they avoid the ugly banding/stepping effect seen with the Camera Standard profile.
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