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Old 13th April 2020, 20:17   #2  |  Link
Blue_MiSfit
Derek Prestegard IRL
 
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Join Date: Nov 2003
Location: Los Angeles
Posts: 5,988
Fun project!

Here's one thing I've been trying to wrap my mind around regarding HLG: I get that one of the big appeals is "backwards compatibility", and I totally see how, from an EOTF standpoint it's somewhat backwards compatible with SDR. In other words, you could feed an HLG signal to a dumb SDR display and the luminance would look mostly correct.

However, I don't understand how (without some other component) it can be backwards compatible from a color gamut standpoint. If you're doing HLG with Rec2020 or P3, from what I understand that will NOT look correct on a non wide-gamut display. Gamut conversion is not trivial.

So... how does that work?

Your screenshot looks at least mostly correct to me, so I'm wondering how you / VLC converted the gamut from Rec2020 to Rec709.
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