http://blog.natebeck.net/2009/01/tip-of-the-day-update-your-copy-of-flex-builder/
Saving Images Out of Flash/Flex Without Losing Quality
Flash Player 10 comes with a nifty new method for the flash.net.FileReference class called “save“. What’s dope is that you can send it a ByteArray, and it’ll write it verbatim. This means, saving images out of your Flash & Flex Applications is wicked fast now AND gets around that lamesauce security restriction that plagued a lot of older Flash Player 9 code…
http://jessewarden.com/2009/01/saving-images-out-of-flashflex-without-losing-quality.html