I made a video legaliser that hard clips (yuck) to 100%IRE and 0%IRE. It should be a last step before output, to catch excursions outside legal color space.
You can see on the waveform from the Split Viewer, that I have used a Brightness and Contrast node to push the values into illegal color space (right). On the left shows the results of the clip function.
In this screen you can see that I have added a Less Than node and overlayed it to act as a Clip warning. So you know where the clipper is having effect.
You can use the curves tool to do this but you can’t enter a value to drive the curve. Also I think the curve tool works with a normalised value of the input image. So it can have a different result for each source, not helpfull for garunteeing clip to a set value.
Legaliser nodes.blend (683 KB)