diff --git a/doc/progs/image_package2.go b/doc/progs/image_package2.go
new file mode 100644
index 0000000..fcb5d9f
--- /dev/null
+++ b/doc/progs/image_package2.go
@@ -0,0 +1,16 @@
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import (
+	"fmt"
+	"image"
+)
+
+func main() {
+	r := image.Rect(2, 1, 5, 5)
+	// Dx and Dy return a rectangle's width and height.
+	fmt.Println(r.Dx(), r.Dy(), image.Pt(0, 0).In(r)) // prints 3 4 false
+}