Looks like the recommendation ITU-R BT.2100-0 is hot off the press. This quote
from the front section leads me to believe that it's not the clever
Philips-Technicolor proposal, however.
http://www.itu.int/dms_pubrec/itu-r/rec/bt/R-REC-BT.2100-0-201607-I!!PDF-E.pdf
"... recommends that for programme production and international exchange of
HDR-TV, the perceptual quantization (PQ) or Hybrid Log-Gamma (HLG)
specifications described in this Recommendation should be used.
"NOTE - The PQ specification achieves a very wide range of brightness levels
for a given bit depth using a non-linear transfer function that is finely tuned
to match the human visual system. The HLG specification offers a degree of
compatibility with legacy displays by more closely matching the previously
established television transfer curves. Conversion between these formats may be
accomplished using the approach illustrated in informative Annex 2."
They seem to be saying that two HDR methods are recommended, and that one can
translate from one to the other.
Furthermore, that one of the two methods (HLG) "offers a degree of
compatibility" with legacy displays.
To me, this says that legacy displays would have to be fed by a STB, which
converts and PQ-based HDR into HLG, and then hope for the best, or perhaps do
some extra conversion.
Doesn't seem to be the best option. Would be nice to see what the selection
criteria were.
Bert
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