diff --git a/colour.hpp b/colour.hpp
index 890e0c61..de87be52 100644
--- a/colour.hpp
+++ b/colour.hpp
@@ -76,6 +76,10 @@ namespace cruft {
         using colour<S,T,srgba<S,T>>::colour;
     };
 
+    template <typename T>
+    using srgba1  = srgba<1,T>;
+    using srgba1f = srgba1<float>;
+
     using srgba3f = srgba<3,float>;
     using srgba4f = srgba<4,float>;