xvYCC file support in Premiere

[rgr2]

In the thread below I discussed the problem of editing my MTS files, which are recorded in the full color range.

It found that these are files in the xvYCC format.

So according to the format description:
xvYCC expands the chroma values ​​to 1-254 (i.e. a raw value of -0.567–0.567) while keeping the luma (Y) value range at 16-235 (though Superwhite may be supported ***), the same as Rec. 709.

(*** - In my case, the Y range is 16-255)

And here I have questions.
1. Does Premiere natively recognize xvYCC?

If not, then:
2. Can I edit movies in Premiere in the full chrominance (1-254) and luminance (16-255) range?

That would be enough for me, because I would do the following:
1. I would keep the UV chrominance range in the range of 1-254 (as required by the standard).
2. I would correct the Y luminance to the level of 16-235 (my camera records in the range of 16-255).

After saving the file, all I would have to do is edit the headers and add information about the xvYCC format (modify the Transfer-Encoding if I remember correctly).

[rgr2 · Accepted solution]

I more or less know how to do it.

1. Premiere saves the full range 0-255 as in the input file -- it does not clip the range 0-15 and 235-255. So the data is preserved.

2. The Rec709/xvyCC standard provides a luminance range of 0-235 with the possibility of Superwhites and my camera records that way -- in a luminance range of 16-235.

And here's the question -- which filter should I use to change only the luminance from 16-255 to 16-235, preferably linearly?

I see several possible filters:
- Lumetri Color - Whites set to -30 and I more or less get what I want on the graph. But what units is this 30 in?
- Brightness & Contrast -- this filter probably won't work, because I see that it clips white above 235 (I set both to -7.5 and I also don't know what these units are)
- ProcAmp - I set the contrast to 92.5 (are these percentages?) and I see that the bottom of the graph doesn't change, but the rest is linearly reduced
- Levels - this one would probably be the best. I set the White Input Level to 255 and the Output Level to 235 and logically it should work. But on the YUV graph I see that the chrominance is also changed, and that's not the point. Well, it's an RGB filter...

[rgr2]

I'm correcting myself -- it should be:
The Rec709/xvyCC standard provides a luminance range of 16-235 with the possibility of Superwhites.

The chrominance range is 0-254.