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Need to debayer ALL OSC cameras before stacking them, otherwise you get THAT trellis/tartan effect. And it needs to be the CORRECT matrix - easiest way is to photograph something in the day through a pinhole cover on the camera (camera obscura), then change the settings until the colour represents what you see (I initially do it with parked cars and trees).
The only way also to get a grey scale image with an OSC is to first make it colour, then in post-processing convert it back to greyscale.
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