SD video playback on computer - double check
Ok, SD video is 720x480 - when played back on video devices, right?
SD video played back on a computer is 640x480, right? So if I'm resizing video for distribution on the web, I work off of 640x480? To use 480 (640 x 75%) as my width, then my height would be 360, right? (480 x 75%) Or am I totally in the weeds? Initially I thought the height would be 320. But that was when I was working off of a 720x480 frame size. Sorry for the simple question, that I may have answered myself, but I just need to be sure that I've done this the correct way. I'd rather asked a simple question here than get it wrong somewhere else... Thanks for the help... Kevin |
Computer monitors have square pixels, so the image must have the exact same proportions as its aspect ratio - either 16:9 or 4:3. So the formulas are:
16:9 video ------------ 16 / 9 X height = width or 9 / 16 X width = height 4:3 video ----------- 4 / 3 x height = width or 3 / 4 X width = height |
Thanks.
I thought that's what I had forgot to figure in, square pixels... Kevin |
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In the PC world 1:1 PAR was introduced with VGA standard, when was it, 1988? 640x480 gives 1.3(3), exactly the proportions of 4:3 monitor. Prior EGA standard had 640x350, CGA was capable of 320x200 or 640x200, all these settings produced proper picture on a standard 4:3 monitor. This is an interesting entry: http://www.microsoft.com/windows/win...xelFrames.aspx Quote:
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