[Cin] Trying to understand colour, try N!

[Andrew Randrianasulu]

вт, 7 нояб. 2023 г., 18:47 Andrew Randrianasulu <randrianasulu at gmail.com>:

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> вт, 7 нояб. 2023 г., 18:32 Andrew Randrianasulu <randrianasulu at gmail.com>:
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>> вт, 7 нояб. 2023 г., 18:13 Andrew Randrianasulu <randrianasulu at gmail.com
>> >:
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>>>
>>> https://blender.stackexchange.com/questions/46825/render-with-a-wider-dynamic-range-in-cycles-to-produce-photorealistic-looking-im
>>>
>>>
>>> well, this one says EXR can hold quite a big value per channel, way
>>> above 1.0f, obviously.  But for displaying (and encoding?) it must be
>>> compressed back to device-specific 0 - 1.0 range.
>>>
>>> Thing is, if I open exr example file in gimp 2.10 and re-export it - it
>>> retain its above 100% values. It does not do this if I do this same
>>> roundtrip via cingg. So yea, we seems to be clamping at output.
>>>
>>
>> and this article about Premiere tries to explain Scopes, and especially
>> floating point vs 8bit input - Premiere apparently can limit this setting
>> for scopes themselves....
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>> https://blog.frame.io/2017/09/27/introduction-to-video-scopes/
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>>
>> so, HDR as used in ultra HD need some scope that goes to 10.000 (so,
>> logarithmic I guess ...)!
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>> something we should write somewhere in TODO, I guess .....
>>
>
> second technique about dealing with too shadowy video:
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> https://larryjordan.com/articles/premiere-pro-two-options-to-control-sdr-video-black-levels/
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> =====
>
> *A CREATIVE USE OF BLEND MODES*
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> This tip was suggested by *FoodShipNine*.
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> If all you want to do is control black levels, but let highlights float –
> which would apply to most web videos – here’s an option.
>
>    - Using *File > New > Black Video*, create a new video clip. This
>    contains a single color – black – with a video level of 0 IRE.
>    - Place it above all clips in the timeline, similar in concept to an
>    adjustment layer.
>
>
>    - Select the black video clip then, in *Effect Controls*, set *Opacity
>    > Blend Mode* to *Lighten*. This sets all pixel grayscale values in
>    all clips below the black video clip to whichever is lighter, the black
>    video clip or the video itself.
>
> ======
>
> so, if we does not have this mode we probably should :)
>

https://prolost.com/blog/aces


according to this article Tarantino unintentionally got his own color space
{ I think this is a joke, too uncinema-tic for understanding it }

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The ACEScc log color space is, in my experience, a creatively-friendly
color space for grading. There’s also a tweaked version of it called
ACEScct. The T is for “toe,” so this is the profile favored by Quentin
Tarantino.

=====

this made me stop and laugh! Not sure why .... hopefully all of this can be
realized by those cube lookup tables?


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>>>
>>> Still not sure where, may be in fader? (where fade can't be more than
>>> 100%) . May be its time to ask Lion (Adam).
>>>
>>
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