Save images to CameraRoll - iOS

Hi, I'm currently using the code below to save a screenshot of my app in Flash AIR 2,6:
var cameraRoll:CameraRoll = new CameraRoll();
var bitmapData:BitmapData = new BitmapData(640,960);
bitmapData.draw(MovieClip(root).stage);
cameraRoll.addBitmapData(bitmapData);
The app is working fine, in fact it saves the screenshot in the iPhone's CameraRoll.
So... the question is "what's the problem?": The problem is that the definition of the saved shot is not very high.
It seems like it has got a low JPEG quality... is it possible? Is there a way to save a more defined image in the CameraRoll?
Thank you all
Brandon

I've developed an Android and iOS app that use the CameraRoll.addBitmapData() method. On my HTC Incredible device, there is a lot of JPEG compression happening when the image is saved. But the image is still compressed on iPhone 4 devices too, but not to the same extent. Note that you should copy the image from the device to your PC to be 100% sure of the image quality, as I understand that sometimes the Android phones show a scaled-up thumbnail, rather than the actual image, when browsing images.
Either way, it would be nice if you could control the CameraRoll API so that the level of compression is configurable, but I don't think this is currently possible.

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