diff --git a/robotgo.go b/robotgo.go
index 048a32f..3e07475 100644
--- a/robotgo.go
+++ b/robotgo.go
@@ -820,6 +820,19 @@ func TostringBitmap(bit C.MMBitmapRef) *C.char {
 	return strBit
 }
 
+// ToBitmap trans C.MMBitmapRef to Bitmap
+func ToBitmap(bit C.MMBitmapRef) Bitmap {
+	bitmap := Bitmap{
+		ImageBuffer:   (*uint8)(bit.imageBuffer),
+		Width:         int(bit.width),
+		Height:        int(bit.height),
+		Bytewidth:     int(bit.bytewidth),
+		BitsPerPixel:  uint8(bit.bitsPerPixel),
+		BytesPerPixel: uint8(bit.bytesPerPixel),
+	}
+	return bitmap
+}
+
 // GetPortion get portion
 func GetPortion(bit C.MMBitmapRef, x, y, w, h C.size_t) C.MMBitmapRef {
 	var rect C.MMRect
diff --git a/test/bitmap.go b/test/bitmap.go
new file mode 100644
index 0000000..3e3b620
--- /dev/null
+++ b/test/bitmap.go
@@ -0,0 +1,17 @@
+package main
+
+import (
+	"fmt"
+	"reflect"
+
+	"github.com/go-vgo/robotgo"
+)
+
+func main() {
+
+	var bitmap robotgo.Bitmap
+	bit := robotgo.OpenBitmap("./test.bmp", 2)
+	bitmap = robotgo.ToBitmap(bit)
+	fmt.Println("...type", reflect.TypeOf(bit), reflect.TypeOf(bitmap))
+
+}
diff --git a/test/test.bmp b/test/test.bmp
new file mode 100644
index 0000000..897b993
Binary files /dev/null and b/test/test.bmp differ