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Luminosity mask in local adjutments - copy paste no delivering same mask



  • Brian Lawson Community moderator

    There is another user having the same problem.

    I haven't been able to duplicate it on my system but I will download your files and take a look to see if I can figure out what is going on.

  • Rick Sammartino Community moderator

    Hey Lawrence, I downloaded your image and tried it on my Windows PC. I tried it multiple times but I was unable to make the error occur. I expect errors like this to be caused by the GPU. I don't know how Mac uses GPU but mine is almost brand new and I did have the occasional error like this when I was still using my old GPU.

    When Brian gets back I'm sure he'll try it on his mac as well.

    Just FYI, when you create a luminosity mask and then tweak it with a brush, those are actually two different masks being combined within the program. So it's not straight copy/paste, there is a calculation going on as well and that's where the GPU would come in.


  • Brian Lawson Community moderator

    I'm not able to duplicate the problem either on my M1 Mac Mini. What I pasted is identical to what I copied. In fact, looking at your Adjustment Layers what I see is also identical between all 3 masks. The masks in your file do not match what I see in your video example.

    You can see the Luminosity Mask settings I used for my starting point. I then Painted Out over the bird with the Perfect Brush with the settings Color Threshold 5, Transition 34. With the same settings I Paint In to make the background pure white.

    What are your system specs? Which Mac are you running, OS version, etc.

  • Brian Lawson Community moderator

    I was looking at your file some more and I honestly believe that using a Luminosity Mask is the wrong way to go for this image. The background tones are just too similar to the tones in the bird to get a clean separation which leaves a lot of manual clean up to do.

    I would use either the AI Mask or do what I ended up doing on top of the Luminosity Mask that I started with and just paint it in by hand with the Perfect Brush. It only takes about a minute to get the rough draft and another minute or so to clean it up. With all the brushing on top of the Luminosity Mask you wind up with the same thing in the end.

  • Lawrence Baertschi

    Thank you both for kindly looking at my matter.

    I was using the Luminosity mask plus cleaning up with the perfect brush in previous versions in the past and I never had problems with exceptions to the last release of the 2021 version and both 2022.5 versions.
    The luminosity mask works really fast for me and it's never been an issue, with the exceptions of the above versions.

    Below I leave you my specs of my MBP

    I am running On1 2022.5 (
    Mac Book Pro 2021 - 16 inch, M1Max with 32GB RAM on Mac OS 12.4

  • Brian Lawson Community moderator

    It isn't your GPU since you're running an M1.

    I stand by my recommendation that for _this_ image Luminosity may not be the best option. The bird and the sky have pretty much the same tone so there isn't much difference for the program to separate one from the other.


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