[opendtv] Re: Chroma Formats, P versus I, and Resolution Issues

  • From: "Tom McMahon" <TLM@xxxxxxxxxx>
  • To: <opendtv@xxxxxxxxxxxxx>
  • Date: Thu, 16 Dec 2004 08:07:13 -0800

Note that the D-Cinema context has only one pass thru the following sequence:

Master in 4:4:4, convert to 4:2:0, convert to compressed state, then 
distribution, back to uncompressed state and back to 4:4:4 then
display.

If the application required more passes I might have a different opinion 


-----Original Message-----
From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] On 
Behalf Of Craig Birkmaier
Sent: Thursday, December 16, 2004 7:14 AM
To: opendtv@xxxxxxxxxxxxx
Subject: [opendtv] Re: Chroma Formats, P versus I, and Resolution Issues

At 2:24 PM -0800 12/15/04, Tom McMahon wrote:
>* After spending a few years looking at the highest possible quality 
>progressive D-Cinema imagery on the biggest screens with the best (2K 
>black chip) projectors going thru both 4:2:0 and 4:4:4 codecs, I see no 
>reason not to use 4:2:0 chroma format for compression (so long as the 
>imagery is progressive).

I bow to Tom here, as he has had much more access than myself to recent demos. 
But I think he would agree, that extending the color
gamut beyond the current Rec709 limits does make a noticeable difference.

Regards
Craig
 
 
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