Overview: HDR metadata and light levels
HDR metadata describes mastering conditions or content light levels that can inform presentation and adaptation.
A mastering display description and a report about the programme's brightest content describe different things. This group separates those signals, including ST 2086, MaxCLL and MaxFALL. Their meaning provides context for a renderer's decisions rather than one universal instruction for the screen's brightness.
HDR metadata
HDR metadata describes the signal, mastering conditions, or content characteristics used to interpret and adapt an HDR picture.Mastering display metadata: SMPTE ST 2086
SMPTE ST 2086 describes the color primaries, white point, and luminance range configured for the mastering display.MaxCLL and MaxFALL
MaxCLL and MaxFALL summarize the highest content light level and highest frame-average light level reported for a video.