720 x 480 using square pixels would be 640 x 480.
800 x 600 should have no stretch to it.
H x PAR = SH
Explanation: Horizontal resolution (H) times PAR (Pixel Aspect Ratio) equals SH, Square pixel horizontal resolution.
so using that math
720 x .9 = 648 not 640....so why is 720x480 nonsquare = 640x480 square...?
This is because we are (to a certain extent) comparing apples to oranges. Just because you have 720x480 @ ~0.9 and 640x480 @ 1.0 does NOT mean that they represent the same area. They don't, in fact:
The 4x3 or 16x9 "area" of standard NTSC or PAL video is approximately the innermost 704 pixels. So…
720 - 704 = 16
You must crop 8 pixels from each side prior to scaling.
720 - 16 = 704
704 * (10/11) = 640
I don't have CS4, and have only been scanning the CS4 forums; so there may be better links regarding this in this forum. CS4 changed the par to a more "correct" option. It is not .9 now but .91. (See Dan's little "about" before the .9.) And when you are dealing with 800x600, there may be other issues.
I like the AE/Meyers explanations of all this (so also see the regular help for Premiere):
There are 2 pdf article links on that page.
Also see the free Meyers video on Lynda.com
EDIT: I missed the more relevant thing in Dan's: see the 10/11 as the multiplier rather than .9? 10/11 is the "new" .909090 = .91.
Message was edited by: Stan Jones