> I always wondered if this was a good ratio. I get that green usually has the strongest signal and thus better low-light performance. More importantly, green

> I always wondered if this was a good ratio. I get that green usually has the strongest signal and thus better low-light performance. More importantly, green is close to what your eyes perceive as luminance. This is important because you can perceive a lot more luma detail than chroma detail. This is why things like 4:2:2 sampling work. If you read Bayer's original patent, he proposed using Y Cr Cb (luminance, colour part red, colour part blue) instead of GBR filters[0]. This would people optimal from a computer science perspective. Sadly it doesn't work physically. Sensing negative-blue and negative-red can't really be done with a simple filter. [0] https://patents.google.com/patent/US3971065 https://patents.google.com/patent/US3971065