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Peter
I had look on CN but I couldn't find Jon Ristas' post, but it was in reference to eliminating FPN rather than just hot pixels.
I remember him saying that for some cameras a 20 pixel dither may necessary to randomise the FPN so it got eliminated in stacking.
These numbers are for the max dither setting so the dither can move 2,3,5 or 10 pixels depending on its max setting.
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