Hi all.
I'm new to darktable and somewhat new to raw image processing so please
excuse me if this is a naive question.
I was trying to denoise some images from my Sony a7 II R shot at 51200 ISO.
I followed some tutorials that recommended applying wavelet denoise with
blend=color and non-local means with blend=lightness.
I noticed some bright green highlights appearing. I played around with
the demosaic-ing and noticed that it even happened with
the "rough monochrome" demoisaicing and so I thought it might be worth
asking if this is a bug or some odd interaction of the filters.
You can find a picture here:
https://whttps://www.dropbox.com/s/ozjy3dk84zgvs6s/DSC00961.ARW?dl=0 and the
xmp here: ww.dropbox.com/s/fr24nz7zgz7xgd9/DSC00961.ARW.xmp?dl=0
If you go to the highest zoom level with wavelet denoising on the color
and raw monochrome demosaic, you will see the bright green artifacts.
They disappear when disabling the color denoising with wavelets.
Using any other demosaic algorithm, you'll see magenta artifacts in the
highlights as soon as you turn the color denoising on.
My question is: is this expected? In particular with the monochrome
demosaic the artifacts seem very odd. But in general
I'd love to get rid of the bright green / magenta artefacts in the
highlights when doing the color denoise.
Thank you!
Andy
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