Quote:
Originally Posted by TD-Linux
Aha, looks like 601 vs 709 matrix. Although JPEG is normally sRGB primaries, it uses what is basically a full-range 601 matrix. So if your sources are JPEG, a 601 matrix makes the most sense.
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sRGB uses 709, which itself is the average of the 601 PAL (EBU 3213) and NTSC (SMPTE C) primaries. As an industry, we should probably stop talking about "601 primaries" since there are actually two different ones, unless we use it as shorthand for "the primaries used by the original SD video format."
709 was the compromise for HD to make it "international" - as the average of the two, if 601 gets treated as 709 or vise versa, that minimizes the worst-case error compares to 601 PAL <> 601 NTSC.
https://en.wikipedia.org/wiki/Rec._7...chromaticities
As a parochial American, I thought 709 was dumb when it came out, but I have since gained the wisdom to appreciate its simple brilliance.