Understanding HDR
summary
Declares HDR as a display leap comparable to HDTV then shows concrete plumbing: Apple uses adaptive HDR that stores an HDR gain map inside JPEG EXIF rather than HIC files; back ends must not strip EXIF. Apps can request EDR with wantsExtendedDynamicRangeContent and use extendedDisplayP3 float color spaces; check availability via currentEDRHeadroom (no notifications so poll) and expect fallbacks when sunlight or low power reduces headroom. Built an HDR pipeline with Metal and Core Image and ships a custom HDR merge algorithm.
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chapters (8)
- 0:00Introduction to HDR
- 2:16HDR mode vs. HDR displays
- 3:24Why HDR matters
- 5:36Understanding dynamic range
- 8:59Implementing adaptive HDR
- 12:34Drawing with EDR
- 14:44Limitations and considerations
- 17:23Color management and summary
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