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adywan said:
The HD source was downscaled to 1024 x 576 and would have been scaled down to 720 x 576 and 720 x 480 for the respective PAL & NTSC DVD's.
I almost hate to say this Ady, but those numbers are the tiniest bit wrong...
720x576 pictures should be upscaled to ~1050x576, because 16 (NTSC) or 18 (PAL) of those 720 pixels make up nominal analogue blanking and should not to be taken into account when calculating aspect ratios. The reverse is also true - HD video should be scaled to 702x576 or 704x480 and padded to 720 (or just 704, which is also legal for DVD video).
The Death Star schematic in my ANH edit is 2.5% off a true circle for exactly this reason *facepalm*. But as I've recently realised, the actual Death Star is 10% off, so no biggy.
Happily, the difference is barely noticeable even for that circle, and there's no NAB in HD which does have truly square pixels, but if we weren't sticklers for detail we wouldn't be here, right? ;)
DE