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Warp wrote:
> clipka <nomail@nomail> wrote:
>> I agree, however, that (b) is not an ideal solution either, as a 1:1 pixel
>> aspect ratio may not always be desired.
> 
>   There is a practical example which, while not extremely common, is
> nevertheless very plausible: Rendering a widescreen DVD video.
> 
>   If I remember correctly, the DVD format has two basic aspect ratios:
> the traditional 4:3 and the newer standard 16:9. However, the raw image
> pixel data is *always* in a 4:3 format. A 16:9 video is anamorphically
> squeezed to 4:3 (and thus a DVD player will make the reverse stretching
> when it has to display on a 16:9 resolution).
> 
	Actually, it's almost *never* a 4:3 ratio. Typical formats include:
720x576 (PAL), 640x576 (PAL), 480x576 (PAL), 720x480 (NTSC), 640x480
(NTSC, the only 4:3 format here) and 480x480 (NTSC). Of course, this
is only for SD. Typical HD formats do have 16:9 ratio...

		Jerome
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mailto:jeb### [at] freefr
http://jeberger.free.fr
Jabber: jeb### [at] jabberfr
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=Bgie
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