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Shadow/Highlight Luminosity Mast

These steps create a luminosity mask protecting the shadows:

  1. Open the Channels Panel in PS
  2. CMD+Shift+Click the RGB Channel which selects the brights.
  3. CMD+Shift+Click the RGB Channel again and more darker areas are selected (leaving only the shadows)
  4. Cmd+Option+Shift+Click selects only highlights
  5. Cmd+delete key fills the selection with Option+delete (FG/BG) or Shift+delete key for fill options.

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