Computers use square pixels, TV has rectangular pixels, and depending on the system you are using, PAL, NTSC, 16x9 or 4x3 the shape changes. Prepare to have your head explode with maths and have a look at: http://www.bbc.co.uk/commissioning/branding/picturesize.shtml I have found that different bits of TV software e.g. Premier, Final Cut Pro,Discreet Flame and Quantels Edit Box all do different things to to incoming "computer graphics". I normally use 768x576 for PAL 4x3 pictures and 1024x 576 for PAL 16x9 widescreen. But you could try making one frame with a large circle on it. Then importing that and see how distorted it looks on TV. Groucho