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  • Deletes everything that is 50% grey.
  • Painting with black only darkens darker grey selectively. Painting with white only lightens lighter grey selectively. This is useful for refining Layer Masks.

Refining Masks with Overlay

  • Using Overlay Blending Mode is particularly useful for removing greys from Masks and Channels, which themselves only consist of black, white and grey. This produces a much better selection.
  • Painting in White turns light greys white. 
  • Painting with Black turns dark greys black.

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