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acme (189)

acme
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http://www.astray.com/

Leon Brocard (aka acme) is an orange-loving Perl eurohacker with many varied contributions to the Perl community, including the GraphViz module on the CPAN. YAPC::Europe was all his fault. He is still looking for a Perl Monger group he can start which begins with the letter 'D'.

Journal of acme (189)

Friday March 09, 2007
11:17 AM

4:2:0

[ #32630 ]
I've always wondered why text on Digital Video looks a little crap and due to the wonders of Wikipedia I know now why. It turns out it's due to chroma subsampling. PAL DV uses 4:2:0 chroma subsampling, which means that the vertical resolution of the chroma is roughly halved. In other words, it's a compression artifact and in the future everything might well be actually lossless and better.
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