Photoshop's Blending Sliders allow you to show or hide the contents of a layer based on brightness of the active layer or underlying image. This is a very basic (but very useful) luminosity masking technique that is useful when you want to limit where an adjustment or layer appears to prevent it from affecting the bright or dark areas of the image.
NOTE: Some Windows users have reported issues accessing the video playback controls. While we're working on the issue, here's a Temporary Workaround: Click "Introduction" in the table of contents to the right of the video and then immediately click within the video to give it focus. After doing so, use the spacebar to play/pause the video and the left/right arrow keys to scrub forward or backward within the video.
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