[Cin] Adobe Premiere (2021) and HDR

[Andrew Randrianasulu]

ср, 16 апр. 2025 г., 23:20 Andrea paz via Cin <cin at lists.cinelerra-gg.org>:

> There are techniques to extract some detail in the areas burned out by
> overexposure(I read about it in the book of Alexis Van Hurkmann:
> "Color Correction Handbook", section: "Dealing with overexposure").
> These techniques take advantage of “superwhite,” that is, values above
> the “reference white”  (or white point) value. I, for years, have
> assumed that superwhite is above 1.0. In fact, in videoscopes, values
> as high as 110% can be seen.
> I went back and read poynton's book
> (
> https://wangwei1237.github.io/shares/Digital_Video_and_HD_Algorithms_and_Interfaces_2nd_ed.pdf
> )
> and I found that actually superwhite is only mentioned in reference to
> the limited range (mpeg, 16-235) and not the full range (jpeg, 0-255).
> It is mentioned in the “swing study” section on page 42 and also in
> the “Processing coding” section on page 45. Basically, my mistake is
> assuming reference white at 235 to be the same as reference white at
> 255 and corresponding to 1.0. Instead, apparently, even if you have
> limited range values above 1.0 they are still within the 0-1.0 range
> of the full range, and thus are still “legal” values.
> I'm sorry, I have bothered you for a long time about something wrong....
> There are still many things I don't understand in the color pipeline,
> but I'll stop here.
>

But as we found out DaVinci Resolve _does_ have ability to work with color
values in floating point above 1.0f ....

*I think* main use there is "quickpatch" small overexposures you discovered
over plenty of layers of effects, without re-tuning all of them. Or
something similar.

Also, intended by original author abuse of cinelerra as photo processor ;)

We still have complex question if it possible to do anything useful
color-wide with HDR source if you only have SDR monitor ...

FCP for example does have "tonemapped to SDR" viewers, but not sure if
people *grade for HDR* on them, or just cut/assembly? IMO even cut/assembly
might be useful ....

https://support.apple.com/ru-ru/guide/final-cut-pro/ver06915f2fe/11.1/mac/14.6

====
View HDR video in the viewer in Final Cut Pro for Mac

In Final Cut Pro, you can view HDR video in the viewer with tone mapping
applied, which compresses bright image content and reduces the apparent
dynamic range of the video to fit the viewable range of your display.

Important: To play back the wider range of colors in an HDR project with
maximum accuracy, you can use the A/V Output feature with an external
reference HDR video monitor. See Play media on an external display in Final
Cut Pro for Mac.

When you view HDR video, the Show HDR as Tone Mapped setting is turned on
by default in most cases, applying tone mapping to the HDR image in the
viewer. This setting does not affect how HDR content is displayed on an
external monitor using A/V Output.

Note: If you’re using Final Cut Pro with a Pro Display XDR that’s set to
HDR Video or another reference mode preset in Displays settings (in macOS
System Settings), tone mapping is disabled.
Turn on tone mapping for HDR video in the viewer

    In Final Cut Pro, position the playhead on an HDR clip in the timeline
or browser, so that the clip appears in the viewer.

    Click the View pop-up menu in the upper-right corner of the viewer,
then, in the Display section, choose Show HDR as Tone Mapped. (When tone
mapping is turned on, a checkmark appears.)

If you’re using a system with a Pro Display XDR, the Show HDR as Tone
Mapped setting is appropriate for day-to-day playback and editing with the
default preset (“Apple Display P3-1600 nits”) in Displays settings. To use
the Pro Display XDR for critical tasks such as color correction, see Color
correct HDR video with Pro Display XDR and Final Cut Pro for Mac.

====





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