Wrong blacklevel in .CR2 files?

[DerMax]

Hey there,

I often notice some magenta cast in my 5D III's Raw files.
They appear in the shadows on very high ISOs (25k +) or if I push exposures on lower ISOs.

Normal exposure:
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+3 Exposure


"Shadow calibration"


I think if you turn them black again, they seem to look much nicer!

The Problem is if I touch the Shadow-Slider again, the image becomes green.


Could this be a "blacklevel-problem"?

I already tried the DXo Raw converter - and it seemd to render the shadows as black.
Is there a solution for ACR/LR?

I hope you can help me.

Max

[Danne]

I think darkframe subtraction would be a solution. Only worked with that on MLV files so not sure about workflow for canon cr2 files.