On multi head systems, select the screen you want to alter with the combo box. This will also work with xinerama enabled. If you want to set all screens to the same gamma values, enable the Sync screens option. On systems with only one screen this option will take no effect.
En sistemas con varios monitores, seleccione a pantalla que quere alterar co menú despregábel. Isto tamén funciona con xinerama activado. se quere configurar todas as pantallas cos mesmos valores gamma, active a opción Sincronizar as pantallas. Nos sistemas cunha soa pantalla esta opción non ten valor.