For those looking to optimize file-size inside (and outside) of your Flash movie, I have done a fairly in-depth amount of research into which formats Flash handles best once loaded into the main time-line. While I know that many no longer do this, it is ideal for those of us who still do animated presentations on the time-line. I was always under the impression that PNG-24 was the smallest file-size on publish, but I was wrong.
After extensive testing, a flattened LZW TIF with default Photoshop settings seemed to compress the best for images without transparency & take up the least amount of file-size on disk. But, for those transparent image needs PNG-24 (using the Save for Web dialog) won out.
I also noticed, just switching the AS library from 2 – 3 barely increased file-size on publish as well. The same was true with activating JPG de-blocking.
Obviously, if you are remotely loading your images, the smallest file-size image wins that test.
Get the PDF of the breakdown here.
