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Black Dots on White Spots Digital Artifacts
The Leica M Monochrom Typ 246 exhibits image digital artifacts best described as “black dots on white spots”. They often occur where there is a small white area; a black dot appears in the center of the white area. The effect can also invert to white dots on black spots.
UPDATE 07 Feb 2016: Leica may have fixed this issue in a firmware update in late 2015 (unconfirmed).
UPDATE 31 Dec 2020: whether fixed or not in the Leica M Monochrom Typ 246 is unkown to me. But the same type of artifacts exist in the Leica M10 Monochrom.
Leica M Monochrom Typ 246 firmware version 22.214.171.124.
Examples shot using DNGc (lossless compressed raw).
Converted with Adobe Camera Raw 9.0 (414)
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