The Desaturate submenu contains operations that turn an image into a Grayscale representation, using different methods.
Kısım 8.29, “Color to Gray”
Kısım 8.30, “Desaturate”
Kısım 8.24, “Mono Mixer”
Kısım 8.32, “Sepia”
You can access this command from the main menu through Colors → Desaturate.