hdr_uhd_signalling
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==== HDR HLG10 (SDR in VUI) ==== | ==== HDR HLG10 (SDR in VUI) ==== | ||
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What HDR HLG10 (SDR in VUI) means is that in the VUI we signal that the stream is SDR, this is so that non HDR screens will use the standard transfer function for the luma scale (100 NITs). But the stream is actually a HDR stream, and newer 4K televisions will read the VUI, see it is signalled as SDR, then they will check the SEI, and see if the stream has been signalled as HDR, and so then they can decode as HDR. | What HDR HLG10 (SDR in VUI) means is that in the VUI we signal that the stream is SDR, this is so that non HDR screens will use the standard transfer function for the luma scale (100 NITs). But the stream is actually a HDR stream, and newer 4K televisions will read the VUI, see it is signalled as SDR, then they will check the SEI, and see if the stream has been signalled as HDR, and so then they can decode as HDR. | ||
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- | This only works with HLG HDR streams, PQ10 does not work the same (HLG has built in backwards compatibility). | + | This only works with HLG HDR streams, PQ10 does not work the same. HLG has built in backwards compatibility |
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hdr_uhd_signalling.txt · Last modified: 2023/03/09 22:35 by 127.0.0.1