Lightroom 2015.6.1: Highlight clipping triangle in histogram not consistent with clipping display

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  • Updated 2 years ago
After installing Lightroom 2015.6.1 I noticed that the highlight clipping triangle in the histogram falsely indicates clipping, especially when pulling back the highlights slider. The triangle indicates clipping while the clipping display (holding ⌥ while dragging the slider) is black. There's quite a region where this is so, for instance between -82 and -23 for the highlights slider in one particular picture which has some clipping that cannot be defeated by pulling back the Whites slider.

I'm on an iMac with OS X 10.11.6, the uncompressed raw file is from a Sony A7R2.
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Ad Dieleman

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Posted 2 years ago

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Jeffrey Tranberry, Sr. Product Manager, Digital Imaging

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I'm not able to reproduce what I think you're describing. Would it be possible to post a file along with screenshots of what you're seeing? Might help us to reproduce.
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Ad Dieleman

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Thanks for coming back to me.

Below is a screenshot, showing the Highlights slider at -50. The highlight clipping triangle in the histogram indicates clipping, however, there are no red areas in the picture and when I hold the ⌥ key while clicking the Highlights slider, the picture goes all black (can't screenshot that).
Link to raw file with xmp file with Lightroom settings: https://www.dropbox.com/s/mrsf7sxqy087bu2/20160607-012.zip?dl=0

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Steve Sprengel, Champion

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I don't know about the inconsistency between LR's clipping triangle and the lack of red display but if I open the ARW+XMP in Camera Raw and set the output colorspace to AdobeRGB there are two tiny areas of red indicated at 25% zoom, where the red channel is clipped or near clipped in those areas.  I have indicated these on a Fit-View sized image with two color-samplers.  The #2 area is not clipped when the image is zoomed larger than 25% so the clipping-red display must be dependent on screen scaling.  If I set ACR's output colorspace to sRGB there are quite a few areas clipped.

I know there have been problems with the softproof display in the past and maybe that bug is in the clipping indicator logic as well.  Or maybe the clipping indicator logic uses the monitor profile whereas the red-pixels-on-image display does not. 

Here are the two tiny areas of clipping in ACR with AdobeRGB set although the screen-scaling needs to be 25% for them both to show red and this is the Fit view so you can't actually see the red:

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Jeffrey Tranberry, Sr. Product Manager, Digital Imaging

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I think Steve's observation is probably the case (accuracy changes at different zoom factors).

Ad, I don't think anything has changed here. Are you positive this behavior changed after the update?
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Ad Dieleman

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Well, I immediately felt that this had changed when going over some of the pictures I've been working on, but I can't be 100 % sure because I cannot compare to the old version. As it is now, I'll just ignore the highlight clipping triangle; oddly enough the black clipping triangle seems to behave as before.
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Rory Hill

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I have not updated to 2015.6.1 yet.  I just tried this on 2015.6.0 and get identical results as Ad shows, but I am running this on Win 10.  It does not appear that the behavior has changed.