Luminosity helper WIP

Try to make luminosity helper which splits the image on the 7 levels of brightness:
-Brightest highlights
-Bright highlights
-Highlights
-Midtones
-Shadows
-Darker shadows
-Darkest shadows






currently I am working on the possibility of adjustment the brightness range (boundary section)
I hope this will be a useful thing…
P.S. I could not put GIF into post - “invalid file” O_o