Save BitmapData to your HD

import com.adobe.images.JPGEncoder;

var jpgEncoder:JPGEncoder = new JPGEncoder(80);
var file:FileReference = new FileReference();
var id:int = 0;

var bit:BitmapData = new BitmapData(400, 400, false, 0x000000);
addChild(new Bitmap(bit));

stage.addEventListener(MouseEvent.CLICK, onClick);
function onClick(evt:MouseEvent):void{
	// draw some perlin noise
	bit.perlinNoise(200,200, 2, Math.random()*100, true, false,0, true);
	//bit.draw(someClip);
	//bit.draw(someVideo);
	id++;
	file.save(jpgEncoder.encode(bit), "image_" +id+".jpg");
}

This snippet uses the as3corelib which you can download on this page. It uses the JPGEncoder class to save a jpeg image to a users HD. It also makes use of the flash player 10 FileReference.save() method.

I used BitmapData.perlinNoise() to quickly create an arbitrary image…. as the code comments suggest you could easily snapshot a video or other DisplayObject.