Not entirely sure, but I think that this could simply be because of the physics of scanning interlaced video. Isn't 30 20% bigger than 25? With fewer frames, the same scanning rate would produce a larger picture, wouldn't it? On Wednesday, September 3, 2003, at 06:41 AM, Mark O'Brien wrote: > In addition to the different fps rates, there is a difference in > resolution > between PAL and NTSC. In standard 4x3 aspect ratio, PAL has 720x576 > pixels, > and NTSC has 720x480. That's 20 percent greater horizontal resolution > for > PAL over NTSC, but I don't know the history of why this spec diverged > between the two systems.