I understand channel just store color information for an image. But in the real world, what are the actual use cases?
Answer
- Keying. Channels can be used as a starting point for very fast and very accurate selections.
- Storing selections. Storing a selection allows you to do filters and math operations on it.
- 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.
- Un-premultiplying color.
- Viewing raw channel info.
Attribution
Source : Link , Question Author : user1187968 , Answer Author : joojaa