Ahh, Good catch on that, numanoid. I dropped that paragraph somewhere between the brain and fingers.... :P Using an image sequence at full frames uncompressed is also the safest method to get the raw animation; if something causes the render to abort, like a lock-up or a power failure, you can simply resume, starting just after the last completed frame number. Which image format you choose depends on what you are doing. Jpeg can be fine for QT compositing, as there is -usually- little postwork done in many cases, and the smallish sizes that are web friendly tend to obscure the detail blurring in the small window aspect. Bmp and tiff are the formats usually used, and which one depends on what you intend to do. The critical difference between them is that tiff retains he alpha channel information, and any graphics program that recognizes the alpha channel will use it. This does make tiff larger even than bmp, but it gives you the alpha to do masking with. Very large hard drives and lots and lots of DVD-R's and markers are good things to have....