Split/Merge Channels  
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Menu:   Convert > Split/Merge Channels  

Use this command to split an image into color channels/components or merge such channels/components into an image. If you choose this command, the Split/Merge Channels dialog box will appear.

If you want to split an image into color channels/components, click the Split
tab. If you want to merge color channels/components into an image, click the Merge tab.