Thanks for all the replies!
@MStraeten Your video was very informative and helpful - thanks!
@Peter – which one should you use? I had Normal White Level : 14800, Specular White Level : 15312 and Linearity Upper Margin : 10000.
I’m still struggling to grasp why this is occurring. If the highlights are clipped, what is filling them with colour and why? And, from a usability perspective, is this happening with default settings?
The documentation of filmicrgb says
As filmic v6 is so far the best version to retain saturated colors at constant hue, it gets also much less forgiving to invalid colors like chromatic aberrations and clipped magenta highlights, that are much better hidden (albeit not solved ) by simple curves applied on individual channels (no chrominance preservation) with no care given to their ratios.
and goes on to say that this needs to be fixed earlier in the pipeline. And if I change to V5, the issue is gone. But unfortunately the documentation doesn’t provide any examples of which modules are suitable for fixing the issues with clipped magenta highlights, which I’m guessing is the issue?