Use more instances…for some images it is easier than trying to get one mask that works for the entire image. I often use as many as 4…one for shadows one for highlights one for contrast and maybe one blended in a color channel to tweak the shadow or highlights cast … I was stuck in the early days on trying one mask, spreading it and also keeping the end points near zero… After noticing how it was being used by many others and moving to multiple instances I have begun to use it more rather than less which is where I was headed… The different norms also make for different masks so they are worth a try… I often try rgb sum or rgb average for a different mask to work with … so much room to experiment in that module…
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