The LR 7.10 and ACR 10.1 Effects panel Post Crop Vignetting Highlights Slider has no effect on the image. It appears to be disabled in the latest update version. I tried resetting LR Preferences file and the issue remains. It has been reported here:
Rikk - We're not seeing this internally with the latest shipping versions of Lr Classic or ACR. The PCV Highlights slider is working as expected. A video of the issue may be helpful for troubleshooting.
Kelly, just to be clear the Highlights slider in question is a shown below. It is not functioning at all on my Windows 7system with LR 7.1 or ACR 10.1.
And not to state the obvious, but please note that the PCV Highlights slider should only be active when Highlight Priority is selected and the Amount slider is set to a negative value.
Thanks for reporting this issue. The problem has been verified in Lightroom CC 1.1, Lightroom Classic 7.1, and Camera Raw 10.1 on Windows only. Bugs have been filed for all 3 applications and fixes scheduled for the next release cycle.
It is my pleasure to announce that we have released a new version of Lightroom CC tonight. We believe the new version has fixed this issue. Update your application to the new Lightroom CC 1.2 and give it a try.
Thanks, but I have it on highlight priority and the amount is on -100 and the highlights slider doesn't do anything on both my windows and macOS devices. (both are on the latest software.)
It only works on areas with Highlights. If your vignette are doesn't contain highlights it has no effect. Pick a photo with white on the corners and see if it works.
Thanks, I have tried it with other photos and it works perfectly! I don't understand because the photo I want to use it on has white on the bottom edges. Why do you think it wouldn't work on one photo?
There are not enough highlights in the bottom of that photo for the Vignette slider to affect. Using the white balance color picker the Histogram numbers are about 60-60-60 which are not highlights.