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Old 12th June 2017, 01:10   #313  |  Link
Asmodian
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Join Date: Feb 2002
Location: San Jose, California
Posts: 4,406
There are a lot of real HDR videos with BT.709 matrix, it is simply the values used to multiply Y, Cb, and Cr by (while summing the results) in order to calculate R, G, and B. Mastering happens in RGB (YCbCr data is not even viewable as a color image) and as long as you use the correct inverse matrix when converting from YCbCr as you did when converting to it you get the same RGB values back.

The primaries are the important thing, anything with BT.2020 or DCI-P3 primaries could be real HDR, but you cannot tell from just that. How it was mastered and the other metadata is also important, but the matrix used to convert to YCbCr isn't. There will be differences in the rounding errors when converting between RGB and YCbCr with a different matrix; BT.2020 is probably theoretically better for 10+ bit HDR content for some reason(?), but not noticeably so.
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Last edited by Asmodian; 12th June 2017 at 01:19. Reason: reordered sentences
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