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So when I asked earlier if the example source and encode will display the same way, the answer was yes, because the colours will display the same way, but now it's no because the luminance might be a little different?
To be honest, about the only time I convert the colours is when downscaling, or if for some reason I think the source was encoded with the wrong colorimetry, and if I'm re-encoding/downscaling I'm probably going to be applying other filtering such as noise removal and/or sharpening anyway. I might try the 12 step colour conversion method one day, but if I'm taking a high definition video and downscaling it to standard definition it'd have to offer a noticeable quality improvement. Considering the "damage" already being inflicted on the picture through downscaling and other filtering, I'm not sure it'd make enough difference to matter.
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