luminosity masking is a technique that you can use to selectively enhance your images. Unlike conventional masking techniques which often require you to manually create a specific selection to mask an area of an image, luminosity masking creates selections and masks which are based solely on the brightness of the pixels themselves. Home Page - http://www.digitalblackandwhite.co.uk/luminosity-masking/luminosity-grading-photoshop-panel.html/
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