Are you referring to the Color Grading Panel in VEGAS Pro?

Yes.

How did you come to this conclusion and can you share an example of it not working as expected?

Are you working in HDR?

...

Are you working in HDR?

No.

Vegas Pro 21.0.315:

Vegas Pro 22.0.93:

Vegas Pro 21.0.315:

Vegas Pro 22.0.93:

Both result look similar? Am I missing something?

sample:

VP22:

VP21:

If someone doesn't care, they don't have to worry.

Luminance 2 results in an overexposure in both cases anyway. But it is also correct that 2 seems to result in VP21 in total clipping, but not in VP22.

But I wonder if it matters really?

sample:

VP22:

VP21:

If someone doesn't care, they don't have to worry.

Ok now I can see the problem. CGP in VEGAS is far from perfect in reproducing color.

Have u tried VEGAS HSL Adjust OFX Plugin instead see if it reproduce correctly?

Have u tried VEGAS HSL Adjust OFX Plugin instead see if it reproduce correctly?

Yes. It work like VP21
But the question is about the correctness of the work of colorgrading.

Both are in VP22

CGP HSL Luminance result:

Saturated

OFX HSL Luminance result:

More white/Highlight

So its a bug then, hopefully can be fixed on next update release.

We'll see. Do the developers write here that this has been taken into work and will be fixed? If it's just a user forum, then they don't have to.

The development team has been made aware of this bug and is working on it.

if you want a true Luminance adjustment in Color Grading, use the "Hue vs. Luminance" curve, and create a curve with a single point. Moving that point vertically will revise the Luminance values of all Hues in the image.

if you want a true Luminance adjustment in Color Grading, use the "Hue vs. Luminance" curve, and create a curve with a single point. Moving that point vertically will revise the Luminance values of all Hues in the image.

The question is not about that
and about the fact that the current settings are not working correctly

I still do not see that the current settings do not work correctly.

This is a model HSL:

tell me what any color should be at maximum L?
 

@Wolfgang S. Are not luminance values of -2 to +2 just gains, not the L value (0 to 1 scale), the OP may be confusing? It depends on what actual luminance value you start with, if it's high to start with, you'll blow it out very early with the slider.

Just watch the video at the beginning of this topic. Do you see the difference?

@Wolfgang S. Are not luminance values of -2 to +2 just gains, not the L value (0 to 1 scale), the OP may be confusing? It depends on what actual luminance value you start with, if it's high to start with, you'll blow it out very early with the slider.

Should I guess for myself what this 2 means?
According to the HSL color model, L cannot be greater than 1. What does this 2 mean?

I do not know either, what 2 means. Could be explored by using test-charts maybe.

I can tell you what 1 means. It means no change. In the 2 direction means brighter, in the 0 direction means darker.

I still do not see that the current settings do not work correctly.

Watch the video they posted... in VP21, when luminance is cranked to the max, the whole screen goes white. In 22, it does not. This was confirmed as a bug.