Split channels into separate images
You can split channels of flattened images only. Splitting channels is useful when you want to retain individual channel information in a file format that doesn’t preserve channels.
To
split channels into separate images, choose Split Channels from
the Channels palette menu.
The original file is closed, and the individual channels appear in separate grayscale image windows. The title bars in the new windows show the original filename plus the channel. You save and edit the new images separately.