Canon Line Offset Noise

Started Oct 20, 2009 | Discussions thread
OP John Sheehy Forum Pro • Posts: 22,843
Re: Patchy Bandings and Camera Noise Reduction

erikstefan wrote:

Regarding this patchy bandings that only exist on shadows area of "low iso" image,

and on the other hand there is camera "high iso" noise reduction capability that works "good".

Based on the levels of vertical banding at various ISOs, it would seem that the 5D2 does have some kind of correction at ISO 800 (640 - 1000) and above. Banding increases from 200 to 400, and then drops at 800.

Canon should be able to apply high iso noise reduction algorithm on shadows area of low iso image, directly in the camera, on the RAW. Selectively applied only to those patch of shadows area.

I'd never want to see "filter-based" NR in the RAWs. Only simple offset and scalar corrections, which don't lose any subject detail.

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John

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