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Apparently it isn't impossible to place CMOS under laser etcher to destroy Bayer color filters, causing it to become a panchromatic CMOS sensor(?)[0].

Or I think one could argue that Foveon X3 sensors are monochromatic... "More like YCbCr" or something.

1: https://hackaday.com/2021/08/09/using-a-laser-to-blast-away-...