diff --git a/SMILEBASIC/builtinfunctions.d b/SMILEBASIC/builtinfunctions.d
index 53d7107..fc2e2ea 100644
--- a/SMILEBASIC/builtinfunctions.d
+++ b/SMILEBASIC/builtinfunctions.d
@@ -737,6 +737,15 @@ class BuiltinFunction
         }
         return PetitComputer.RGB(cast(ubyte)R, cast(ubyte)G, cast(ubyte)B);
     }
+    static pure nothrow void RGBREAD(int color, out int R, out int G, out int B)
+    {
+        int _;
+        PetitComputer.RGBRead(color, R, G, B, _);
+    }
+    static pure nothrow void RGBREAD(int color, out int A, out int R, out int G, out int B)
+    {
+        PetitComputer.RGBRead(color, R, G, B, A);
+    }
     static int RND(int max)
     {
         import std.random;
diff --git a/SMILEBASIC/petitcomputer.d b/SMILEBASIC/petitcomputer.d
index aa86acc..df6a5b7 100644
--- a/SMILEBASIC/petitcomputer.d
+++ b/SMILEBASIC/petitcomputer.d
@@ -1698,7 +1698,7 @@ class PetitComputer
         throw new Exception("unsuport enviroment");
     }
     //プチコンと違って[A,]R,G,Bじゃない
-    static pure nothrow void RGBRead(uint color, out ubyte r, out ubyte g, out ubyte b, out ubyte a)
+    static pure nothrow void RGBRead(T)(uint color, out T r, out T g, out T b, out T a)
     {
         //エンディアン関係ない
         a = color >> 24;