The Components submenu contains operations which work on individual color components or where you can combine or separate these components.
Section 8.22, « Mixeur de canaux »
Section 8.23, « Extraire le composant »
Section 8.24, « Mono Mixeur »
Section 8.25, « Composer »
Section 8.26, « Décomposer »
Section 8.27, « Recomposer »
You can access this command from the main menu through Colors → Components.