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CCD's are terrible at recording blue light, and are mostly sensitive to (infra-)red.
So they have to artificially boost the green and especially blue values to get correct images, but with boosting comes more noise.
CMOS is mostly sensitive to green, but does alright with green and blue.
Coupled with a better dynamic range you can get pretty much perfect colors out of a CMOS chips.
Blue skies will blow out sooner on CMOS though.