From time to time, people have asked about aspect ratios,
16:9 versus 4:3, and how picture sizes are set up and handled
in Cinelerra.

I must admit that I have gotten it slightly wrong, telling people
that stretching a 720x576 pixels image to 768x576 would yield
"square pixels".  It turns out that a 720x576 PAL image is NOT
a perfectly 4:3-shaped image, as explained here:

http://www.bbc.co.uk/commissioning/tvbranding/picturesize.shtml


Some more details and links can be found in the page where I
found the BBC link:

http://lipas.uwasa.fi/~f76998/video/conversion/

--
Herman Robak

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