Are you planning on putting someone or something in front of this white BG in which case you will have to key them out and superimpose them onto it. You could just use a white graphic image created in something like Paint or Photoshop and set it to a size of 768 X 576 (square pixels) if you are in the UK and just colour it white, save it as a jpeg or TIFF and insert it into a video track in your editor and then insert other video ontop of it, using as I said above Chromakeying.

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Better than a poke in the eye with a pointy stick any day...