24 Mar
2003
24 Mar
'03
9:03 p.m.
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