I think your math might be off.. if you start with a 4:3 image you have to maintain that aspect ratio. So if you want a file to be 576 wide, it must be 432 tall... 4:3...
Jerry
Apple Certified Trainer, Producer, Writer, Director Editor, Gun for Hire and other things. I ski. My Blog:
http://blogs.creativecow.net/Jerry-Hofmann
DVD:http://store.creativecow.net/p/81/jerry_hofmanns_final_cut_system_setup
8-Core 3.0 Intel Mac Pro, Dual 2 gig G5, AJA Kona SD, AJA Kona 2, Huge Systems Array UL3D, AJA Io HD, 17" MBP, Matrox MXO2 with MAX Cinema Displays