Words from Graeme…
This will get updated over time.
Regarding clipping and FLUT™ Color Science…
“Clipping can be a tricky subject – there’s strict mathematical clipping and then there’s practical clipping.
FLUT™ doesn’t allow anything that is not actually clipped (ie 12bit value = 4095) to actually clip. They will get crushed up towards 4095, might actually reach 4094, might in extreme circumstances get quantized up to 4095, but that’s it.
In practical terms, if you crush the highlights way way up, any detail left in them, assuming they are un-clipped and have detail to begin with, will get diminished, just like what happens in film’s soft clip knee. The histogram and right clip meter in the histogram are “practically” oriented. There are 9437184 pixels in your 4k image, and if just a few are clipping, then the bar on the histogram that represents that will be very very short, and probably not visible, even though it does exist.
With visual display of data over such a range of values, some manner of scaling should be used to ensure you can see a reasonable representation of that data, which means unless clipping is “significant”, and the white bar at the right is to help you see that, you may have small amounts of clipped image that the histogram doesn’t reflect. This is perfectly correct and normal as if it works the other way, you end up vastly under-exposing the image to save those odd pixels and ruin the over-all effect.
Hope that explains the histogram monitoring methodology for you.”
Graeme Nattress
