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Filters in colour cameras (CMOS or CCD)

Colour cameras have an array of red, green & blue (RGB) filters in front of the pixels in the detector

So the raw data of an image of stars would really look like this:

Missing colours at each pixel are interpolated from neighbours

Also there is an infra-red blocking filter in DSLRs

The single red pixel here is defective - another story - see my web site,

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