Indeed, I posted another picture. Because there the grey noise is most obvious. I don't want the colour noise to be replaced by black and white and I don't see where this is asked for in the settings. I've uploaded some other files taken at a lower ISO setting (down to 640), including the one in the example which was indeed 10000. The thing is, I don't want the colour noise replaced by black and white pixels. This is what happens though and it didn't in the older version of LR 5,7,1 which I still have on this PC. Unfortunately this version does not support my new camera. Greets Marie Hélène
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