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You use forced BW mode, is this really BW camera (with CFA removed)? This mode is for color cameras converted to Black-White by removing Color Filter Array (CFA)

If no, and you want to use BW mode, it is better to use BW conversion (Ctrl-6), not Forced BlackWhite mode.

Forced BW mode for really color camera (with CFA in place) results in heavy aliasing, because R-G-B levels are very different (white balance is not applied). You may partially suppress this aliasing by Preferences - GPU Processing - Bicubic resampling, but full suppression is not always possible and depends heavily on zoom level


Alex Tutubalin/FastRawViewer team