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shagie • yesterday at 2:21 AM • 1 reply • view on HN

To the "the grandfather of all luminance coefficients" ... https://www.earlytelevision.org/pdf/ntsc_signal_specificatio... from 1953.

Page 5 has:

    Eq' = 0.41 (Eb' - Ey') + 0.48 (Er' - Ey')
    Ei' = -0.27(Eb' - Ey') + 0.74 (Er' - Ey')
    Ey' = 0.30Er' + 0.59Eg' + 0.11Eb'
The last equation are those coefficients.

Replies

zinekeller • yesterday at 2:32 AM

I was actually researching why PAL YUV has the same(-ish) coefficients, while forgetting that PAL is essentially a refinement of the NTSC color standard (PAL stands for phase-alternating line, which solves much of NTSC's color drift issues early in its life).

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