Posted by SFTVratings_troy on 01/31/07 20:16

For comparison other standards are:
240 - VHS (ditto Betamax)
330 - NTSC broadcast
425 - laserdisc (ditto S-VHS)
540 - DVD

I was a bit surprised, but apparently the Electronics Industry
Association measures the resolution differently than one might
expect. They put a giant circle in the middle of the screen, count
the number of visible pixels across, and arrive at a number like "425
for laserdisc" or "540 for dvd". It seems counterintuitive, but
that's how it's done.

I imagine if the DVD is severely compressed, the quality would drop
much lower than 540 (just as a VHS tape recorded in super-slow mode is
only ~120 across). 540 is the ideal, not the norm.

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