[PD] video analysis

[Mathieu Bouchard]

On Tue, 18 Mar 2003, chris clepper wrote:

> actually using 4:2:0 chroma samples (Cb,Cr) are swapped every other 
> line, so each chroma channel is effectively 160*60.  4:2:2 chroma is 
> subsampled at a 2:1.  this is really a trivial amount of data loss 
> and you look at it everyday and never notice.  DVD  and PAL DV25 is 
> 4:2:0, NTSC DV is 4:1:1, broadcast TV is 4:2:2 and so is HDTV.  the Y 
> is the really critical data as far as clarity goes.  as long as the 
> processing is 4:2:2 everything is usually ok.

I thought I had understood the "4:2:0" notation, but now I'm completely
confused. Do you have (a link to) a good explanation of it?

________________________________________________________________
Mathieu Bouchard                       http://artengine.ca/matju