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Rec. 601 coefficients Rec. 709 coefficients (There are also coefficients that correspond to the SMPTE C primaries I think.) And if you want to do a better job, you can calculate luminance correctly. Use the 709 coefficients, apply the saturation adjustment on the gamma-corrected R'G'B' values. You need to do this in the gamma-corrected domain to get the hue looking right. You need to multiply the resulting values by some factor to get the correct luminance. You need to do those calculations in the linear light domain. |
Yeah, back in my hardware days (Grass Valley Emphasys Encoders & Decoders, Model 1000, Model 1200...) we only had to worry about 601.
It wasn't SD then. It was just video. :) Glenn, do you have a good link/reference for Rec. 709? |
ITU has a 3 free downloads promotion! (Yes, I get excited by stuff like that.) Take advantage of it, and download ITU-R BT. 709 for free.
Poynton's book and gamma FAQ and his website are also good resources. |
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