I found it is not limited to 5D II, the 40D also has similar problem. Tried
a little chrominance noise reduction (2 out of 20) it improved a lot, with
the PS red filter still some areas shown posterization but much improved. I
think I need to change my RAW setting to add a little NR even though I can't
see such problem in color mode.
C.H.Ling
----- Original Message -----
From: "Ken Norton" <ken@xxxxxxxxxxx>
>
> The RAW converted file has 100% of the pixels derived from all of the
> detectors of all colors. Therefore, there is no loss of resolution and
> you start out with the full dynamic range of the camera file. When you
> apply red filteration to the image you are not isolating the red
> detectors from the sensor, what you are doing is just filtering the
> derived pixels. If a camera, such as the 5Dmk2, is producing unusually
> strong noise in the red channel of a DERIVED image, then the problem
> isn't in the camera, but in the raw converter. However, if the camera
> in question induces a lot of chroma noise in the converted files, then
> all bets are off.
>
> AG
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