UDeep / device checks
Device checks
Test pages from the profile's Annex A. Each has a control that must not glow and a positive control that must. If a control fails, the result doesn't count.
Record your device, OS and browser versions, brightness setting and room light with your result. Remote-desktop sessions deliver SDR, so don't use them.
Which HDR formats does this screen show?
One referenced pattern in gain-map JPEG, HDR PNG, AVIF and HDR video.
Inline, linked and standalone SVG; vector colours above white.
HEVC and AV1 at 10 and 12 bits.
A blind banding test: PQ ramps rounded to 8 to 16 bits.
A form on GitHub, about two minutes. Reports are kept as records in the repository, in evidence/.