Wonder why they called it EDR - Extended Dynamic Range - instead of High (for HDR)?
On Sat, May 31, 2025 at 2:05 AM Andrew Randrianasulu via Cin < [email protected]> wrote: > https://m.youtube.com/watch?v=COxAt8pl_Xw > "WWDC21: Explore HDR rendering with EDR | Apple" > > 34 min runtime > > What I found interesting that Apple used internal floating-point > representation with some values ABOVE 1.0f but those values probably can't > leak into final video, at best they might remain inside OpenEXR image > format captured at some point "as is" (?) > > There is textual (but more iOS /mobile oriented) description with pictures: > > > https://medium.com/@maxwellyuchenlong/wwdc22-10113-10114-110565-explore-edr-on-ios-842ce9b5d500 > > ===== > > *Reference Mode* > > Reference mode is a new display mode for color-intensive workflows that > pin settings and block out distractions to provide more objective and > reliable reference results for a variety of common videos, such as color > grading, editing, and content mode, similar to the reference presets on > macOS. > > When you enable the reference mode, you will have the following features: > > - The SDK peak brightness is fixed at 100 nits and the HDR peak > brightness is fixed at 1000 nits, so there is a 10x EDR headroom. > - Disables HDR tone mapping to provide one-to-one media display > mapping. > - Disables all display dynamic adjustments that occur to adapt to the > environment, such as True Tone, Auto Brightness, and Night Shift modes, and > instead allows the user to fine-calibrate the white point manually. > > > === end of quotation ==== > > At least back in 2021 Apple was still using Metal (their Vulkan-like > graphics API) and OpenGL for system-wide compositing, not sure if it > changed or not lately? > > Still I am not sure how this provides HDR-like experience on SDR display > (may be by using dynamic mapping?) > > Of course this is just tip of the iceberg I found in few minutes at the > morning. > -- > Cin mailing list > [email protected] > https://lists.cinelerra-gg.org/mailman/listinfo/cin >
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