You open the "Color and Tone" script's window by double-clicking its thumbnail in the Effects palette.
The panel on the right side of the dialog displays the applicable commands.
The Channels panel on the left side allows us to select and edit color channels individually.
When working with large files the "Color & Tone" dialog may open very slow. To speed up the script check the "Turbo"gadget at the dialog bottom.
Since in the "turbo" mode, the left panel is disabled, there appear several channel selecting commands in the right panel.