Steven is dead on with his remarks. That is a lot of work to get to a conversion from 4:4:4 to 4:2:0 but technically is the very best method. I do not go the uncompressed route... Edius using HQ to make a dvd basicaly goes from 4:2:2 to the DVD 4:2:0 and there is no conversion down to DV spec(4:1:1 NTSC and 4:2:0 PAL) that occurs. Because the resolution of HDV is twice the resolution of DV there is more than enough information to create 4:4:4 though.




Horizontal Vertical NTSC
4:4:4--- Y 720 480
Cb 720 480
Cr 720 480
4:2:2--- Y 720 480
Cb 360 480
Cr 360 480
4:1:1--- Y 720 480
Cb 180 480
Cr 180 480
4:2:0--- Y 720 480
Cb 360 240
Cr 360 240
In case of HDV (1440x1080):

4:2:0--- Y 1440 1080
Cb 720 540
Cr 720 540
If we just divide by 2 the horizontal and vertical resolution of HDV signal then we get the result below:

Y 720 540
Cb 720 540
Cr 720 540



which is where the 4:4:4 can come from.

I have a tape question, does MPEG IMX or Digibeta support 4:4:4?