[Cin] Adobe Premiere (2021) and HDR

[Andrew Randrianasulu]

чт, 17 апр. 2025 г., 10:50 Andrea paz <gamberucci.andrea at gmail.com>:

> CinGG is already capable of reading HDR images, as I believe any
> program that works in floating point. Just load an HDR image and then
> read the values in the white with the eydropper tool, to confirm it.
> What to do in CinGG if we are dealing with HDR media? If we have an
> HDR monitor I don't know, in fact if anyone has one, that would be
> useful information. If we have an SDR monitor all we can do is tone
> mapping and bring everything back to SDR. The trouble is that in CinGG
> the plugins that work for tone mapping are only the primary color
> correction plugins, that is, they affect the whole frame. In this way
> we are able to reveal details in the highlights but the midtones and
> shadows become hopelessly pure black. It would take secondary color
> correction tools, i.e., capable of acting only in certain areas of the
> image.


isn't there workaround for this using masks?


Unfortunately, CinGG's two main plugins, namely 3 color way and
> curves (contained in Histogram Bezier) do not support HDR values. My
> old attempt to “unlock” the Value slider in 3 color way was disastrous
> because it destroyed the functionality of the shadow color wheel. I
> don't know why. With Histogram Bezier curves one could lock the shadow
> and midtone values and lower only the highlight values, but, as
> mentioned, this is not possible. This is easily seen by trying tone
> mapping: for an SDR image or a clipped HDR image: homogeneous white of
> value 1.0 becomes homogeneous gray of value less than 1.0. So an
> unnecessary intervention. In an HDR image, the white value above 1.0
> (which we see as homogeneous white = 1.0, however) leads to detailed
> gray values that are no longer homogeneous, thus reconstructing the
> content present in the white.
>
> How HDR values relate to color spaces, I just cannot understand.
>
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