Why does compression in the Y' channel cause the image to be so grainy and low quality to our eyes? Is it because when the irradiance is low, raytracing/path tracing algorithms don't sample as well? Why exactly does compressing the Y' channel make such a big difference?
amandaawan
@sunsarah, I think it looks so grainy and low quality because it is - it's just that when its grainy and low quality in the CbCr channels, we don't perceive its grainy-ness. This effect is more prevalent in the Y' channel as this channel is what causes our "edges" to be seen by making them darker and outlined. And as that's the first thing we notice, we perceive the image that way.
Why does compression in the Y' channel cause the image to be so grainy and low quality to our eyes? Is it because when the irradiance is low, raytracing/path tracing algorithms don't sample as well? Why exactly does compressing the Y' channel make such a big difference?
@sunsarah, I think it looks so grainy and low quality because it is - it's just that when its grainy and low quality in the CbCr channels, we don't perceive its grainy-ness. This effect is more prevalent in the Y' channel as this channel is what causes our "edges" to be seen by making them darker and outlined. And as that's the first thing we notice, we perceive the image that way.