[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Converting Between R'G'B' and 4:2:2

Hi all!

I have just read through this document, and it is quite interesting,
however it I feel that is bases some of the bold statements such as
conversion to YCbCr will cause an unrecoverable loss of 75% of the RGB code
words, are on the assumption that the YCbCr Component Digital used in
current post production facilities is only 8 bit.

8 Bit went out years ago, and is generally no longer used because of the
very reason that computer graphics looked very contoured, as they have no
noise so don't contain any natural dither like live images from say a
telecine. For this reason the standard was raised to 10 bit to cover this a
long time ago.

10 Bit YCbCr is a lot better at accurately matching RGB quantising levels,
and generally does a great job because you get quite accurate match of the
RGB levels and the full RGB level range can be contained in the YCbCr


Grant Petty.
Digital Voodoo.

>> [The entire paper is available in Acrobat PDF format, 130705 bytes.]
>>  <ftp://www2.discreet.com/dl2/whitepaper/discreet_poynton_rgb_422.pdf>

Add D1 connections to your Macintosh.
Come see us at http://www.digitalvoodoo.net or mailto:info at digitalvoodoo.net

Digital Voodoo.
12 Thistlethwaite Street, South Melbourne, Victoria, Australia, 3205
Phone +61 (500) 888 831   Fax +61 (500) 888 832
Phone +61 (3) 9699 4633   Fax +61 (3) 9699 3226

Thanks to Match Frame Austin for support in 1998.
No product marketing allowed on the main TIG.  Contact rob at alegria.com
1001 subscribers in 39 countries on Wed Jul 29 11:49:37 PDT 1998 
subscribe/unsubscribe with that Subject: to telecine-request at alegria.com
complete information on the TIG website http://www.alegria.com/tig3/