...because they rarely match anything sensible to allow 1-2-1 pixcel mapping. Computer screens have resolutions that match standard outputs so why not Plasmas? Is it to do with PAL / NTSC stuff? Sorry I've drawn a blank. I'm sue if I though long and hard enough it'd come to me. Whilst I'm at it (and here-in may lie the answer) what resolution is "standard" TV and DVD in this country and others?