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Question HDR and WCG with 10bits


Active Member

I know that HDR requires 10 bits to allow the higher dynamic range (more brightness/luminance), which is 2 bits more than the standard 8bits video.
In addition, HDR content usually comes with WCG (wide color gamut), like rec. 2020.

So my question is how are both HDR and WCG combined using the 2 extra bits?
If HDR alone requires 10 bits, how is the extra data required for rec. 2020 transferred or represented?


Well-known Member
They are not. HDR is sent as meta data which is outside the 10bit data encoding. The Meta data is basically a set of rules that tells the TV how to adjust the picture to display brightness over a 100nits.


Well-known Member
Are you sure about HDR being sent as meta data?
According to this article, for example, it seems that HDR is encoded with the data and not as meta data...
It's not made clear but it does say in the article;

Essentially, HDR10 is defined as the combination of the following container and coding characteristics:
  • Metadata: SMPTE ST 2086, MaxFALL, MaxCLL, HEVC Supplemental enhancement information (SEI) Messages

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