After Darktable 3.6.1, Panasonic GX80 files get a magenta cast (regression?)

mike3996 · October 17, 2021, 3:42pm

Between darktable 3.6.0 and 3.6.1 something has happened to how Panasonic GX80 raw files are prepared.

First: 3.6.0 and second, 3.6.1.

Trigger warning: I use the old display-referred workflow: basecurve with “preserve colors: NONE” set as default for all files.

The XMP files, generated by my settings, differ in {{rawprepare}} params, nothing else.

3.6.0
darktable:params="0000000000000000ce000000000000008f008f008f008f00ff0f0000"
3.6.1
darktable:params="0000000000000000ce000000000000008000800080008000ff0f0000"

paperdigits · October 17, 2021, 3:45pm

Yes, see Panasonic G9 and Darkable issues (White Balance, colours are off)

mike3996 · October 17, 2021, 3:46pm

Now that I went back to the 3.6.0 and made these comparative files and now came back to 3.6.1 to my pleasant surprise it’s indeed the rawprepare params that I need to correct and I get the old behavior back.

Old raw black levels that worked were 143, the new version defaults to 128, resulting in said cast.

mike3996 · October 17, 2021, 3:47pm

Wonderful news.