[Cin] Apple's EDR technology

[Andrew Randrianasulu]

сб, 31 мая 2025 г., 21:33 Phyllis Smith <phylsmith2017 at gmail.com>:

> 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 <
> cin at lists.cinelerra-gg.org> 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
>> Cin at lists.cinelerra-gg.org
>> https://lists.cinelerra-gg.org/mailman/listinfo/cin
>>
>
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