diff --git a/examples/writePng.js b/examples/writePng.js
new file mode 100644
index 0000000..de6ac91
--- /dev/null
+++ b/examples/writePng.js
@@ -0,0 +1,43 @@
+var fs = require('fs');
+var PNG = require("../lib/png").PNG;
+var w = 320;
+var h = 200;
+
+var bitmapWithoutAlpha = new Buffer(w * h * 3);
+var ofs=0;
+for (var i = 0; i < bitmapWithoutAlpha.length; i+=3) {
+    bitmapWithoutAlpha[ofs++] = 0xff;
+    bitmapWithoutAlpha[ofs++] = i % 0xff;
+    bitmapWithoutAlpha[ofs++] = (i/3) % 0xff;
+}
+
+var png = new PNG({
+  width: w,
+  height:h,
+  bitDepth: 8,
+  colorType: 2
+});
+
+png.data = bitmapWithoutAlpha;
+png.pack().pipe(fs.createWriteStream('colortype2.png'));
+
+
+
+bitmapWithoutAlpha = new Buffer(w * h * 4);
+ofs=0;
+for (var i = 0; i < bitmapWithoutAlpha.length; i+=4) {
+    bitmapWithoutAlpha[ofs++] = 0xff;
+    bitmapWithoutAlpha[ofs++] = i % 0xff;
+    bitmapWithoutAlpha[ofs++] = (i/4) % 0xff;
+    bitmapWithoutAlpha[ofs++] = 0xff;
+}
+
+var png = new PNG({
+  width: w,
+  height:h,
+  bitDepth: 8,
+  colorType: 6
+});
+
+png.data = bitmapWithoutAlpha;
+png.pack().pipe(fs.createWriteStream('colortype6.png'));
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