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Nina

Is Y' here lightness(perceived brightness) rather than luminance since quantization error?

dvernet

What is the difference between luminance and "perceived luminance"? My understanding is that luminance is given by $$\int_{\lambda}\Phi(\lambda)V(\lambda)d\lambda$$ where $V(\lambda)$ measures how bright light at a given wavelength is perceived by the human eye and $\Phi(\lambda)$ the amount of scene radiance at that wavelength, so luminance as we've defined it is already "perceived" luminance.

whdawn

Why we use CIT, YCbCr, instead of RGB. Is it because of storage cost?