When Trying to restrict the effect of a gradient in a grayscal image with a luminance mask there is no visible difference in effected areasRackMultipart2018050933376136w-2a69296b-f21c-4a4d-a432-e7c6501ce895-1867075096.jpg.
Running Mac Os X 10.13.4 on a 2014 Macbook Pro 15"