The Components submenu contains operations which work on individual color components or where you can combine or separate these components.
Secção 8.22, “Channel Mixer”
Secção 8.23, “Extract Component”
Secção 8.24, “Mono Mixer”
Secção 8.25, “Compose”
Secção 8.26, “Decompose”
Secção 8.27, “Recompose”
You can access this command from the main menu through Colors → Components.