Hi Mel
At face value, this sounds like you are seeing the “
Bayer Matrix”?
Most one shot colour ccds have an arrangement of a repeating array of RGBG micro filters over the chip, so that Pixel 1 records the Red data, Pixel 2 records the Green data, Pixel 3 records the Blue data and Pixel 4 records the Green data (again).
Processing software “should” be able to de-bayer the image so that this grid disappears and you are left with a “clean” image.
Cheers
Dennis