Did the digital camera turn purple into blue?

In the final analysis, it is the CFA with 2*2 Bayer arrangement on the surface of CCD/CMOS that makes purple blue! CFA is a Color Filter Array, and its popular name is "Bayer layer" of photoreceptor. This is the thing.

generally, purple is transmitted by the blue B photodiode and red R photodiode of RGGB Bayer layer. However, the signals of R and B diodes in Bayer layer, that is, blue photodiode and red photodiode, were transmitted to the camera image CPU chip, and there was an error when processing the signals. This kind of error is unique to the working mode of the color-producing layer of a monolithic CCD or monolithic CMOS photoreceptor.

you can try it with a 3CCD or 3CMOS camera. 3CCD or 3CMOS is composed of three monochrome photosensitive chips, namely a red monochrome CMOS, a blue monochrome CMOS and a green monochrome CMOS stuck on the prism. Therefore, there is no Bayer layer in 3CCD/3CMOS, and color generation is not Bayer working mode, so there will be no color guessing error.