Saving Bitmaps From Flash in AS3

// Capture the BitmapData of the stage for example
var stage_snapshot:BitmapData = new BitmapData(stage.stageWidth, stage.stageHeight);
stage_snapshot.draw(stage);
// Setup the JPGEncoder, run the algorithm on the BitmapData, and retrieve the ByteArray
var encoded_jpg:JPGEncoder = new JPGEncoder(100);
var jpg_binary:ByteArray = encoded_jpg.encode(stage_snapshot);

var header:URLRequestHeader = new URLRequestHeader ("Content-type", "application/octet-stream");
var request:URLRequest = new URLRequest("/generate_jpg");
request.requestHeaders.push(header);
request.method = URLRequestMethod.POST;
request.data = jpg_binary;

var loader:URLLoader = new URLLoader();
loader.load(request);

// Example RMagick usage...
image = Magick::Image.from_blob(request.body.read).first
image.write("#{RAILS_ROOT}/public/jpgs_from_as/test.jpg")