Photoshop: Channel use cases?

I understand channel just store color information for an image. But in the real world, what are the actual use cases?


  1. Keying. Channels can be used as a starting point for very fast and very accurate selections.
  2. Storing selections. Storing a selection allows you to do filters and math operations on it.
  3. Storing color channels for spot colors. In other words you want to have that golden color on your print or you want varnish on specified locations or just orange.
  4. Un-premultiplying color.
  5. Viewing raw channel info.

Source : Link , Question Author : user1187968 , Answer Author : joojaa

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