Until recently, pressing the alt-key allowed for masking when setting whites and blacks so that you could see clipping within the picture. This ist not working any more. Any ideas? Has anyone else encountered this problem so far?
(Lightroom Classic 12.5 on iMac with Ventura 13.4.1)
Both LRCC and Camera Raw are up-to-date if you refer to that.
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The issue is not that the clipping indicators don't work but rather that the camera profiles are clipping blacks and whites a little lighter than pure black and a little darker than pure white, regardless of the Develop settings.
For example, here's an X-T5 raw with Whites +100, Blacks -100 and extreme clipping set in Tone Curve, first with Camera Classic Neg and then Camera Provia/Standard:
With both, I've hovered the mouse over the blackest area in the photo. For Classic Neg, the histogram shows that blackest area is R 1.2 G 1.2 B 1.2, whereas for Provia/Standard, it's R 0.0 G 0.0 B 0.0. It's similar for the whitest areas also.
Of all the X-T5 camera-matching profiles, only some under-clip this way: Bleach Bypass, Classic Neg, Nostalgic Neg, and Sepia.
I tried another camera, the Nikon Z 8, and many of its camera-matching profiles also under-clip: Blue, Carbon, Charcoal, Denim, Dream, Melancholic, Morning, Pink, Pop, Pure, Red, Sepia, Silence, Sunday, Toy.
I don't know whether this under-clipping behavior was a deliberate design decision or an accident. Of all the profiles for the X-T5 and the Z 8, the only ones with under-clipping are implemented as enhanced profiles (.xmp files) that refer to the .dcp profiles Camera Provia/Standard (X-T5) or Camera Standard (Z 8). These enhanced profiles apply a LUT on top of the base .dcp profile, so it's the LUT that's doing the under-clipping.
Not all enhanced profiles with LUTs under-clip. For example, the Z 8's Toy profile under-clips, while Bleach does not. The only difference between the two is the LUT they apply.
Someone else noticed this two years ago:
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