сб, 31 мая 2025 г., 21:33 Phyllis Smith <[email protected]>:
> Wonder why they called it EDR - Extended Dynamic Range - instead of High > (for HDR)? > It was explained in video - HDR was already multiple-meaning overloaded term ... But I guess they also watched catchy and exclusive term. > 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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