[Tig] LUTs for Video File Codecs

Dan C. Tatut dtatut
Tue May 2 21:51:01 BST 2006


--
Thanks to oktobor for supporting the TIG
--
Hi Tim,

Codec degradation cannot be simulated by a LUT. a LUT just translates a set of colors into another (e.g. for simulating film output, etc). Codecs not only work with pixel intensities (in RGB, YUV or any other colorspace) but they also work with several frames (temporal compression). Moreover a codec is not supposed to change colors. Color changes are just artifacts due to the missing information (usually discarded by the coded at compression time to limit necessary bandwith).

Best, Dan

Dan Tatut
CEO
CHROME Imaging
105 Rue de Lyon
CH-1203 Geneva
Switzerland

Phone: +41 22 807 23 60
Fax: +41 22 807 23 70
Mobile: +41 78 659 11 04
WWW: http://www.chrome-imaging.com


-----Original Message-----
From: Tim Montgomery [mailto:tim.montgomery at finishedit.com]
Sent: mardi, 2. mai 2006 22:40
To: tig at colorist.org; tig-bounces at tig.colorist.org
Subject: [Tig] LUTs for Video File Codecs


--
Thanks to oktobor for supporting the TIG
--
Is there such a thing as a LUT that simulates Codecs like Quicktime and Windows Media?  Is there a general rule when grading for codec degredation?



_______________________________________________
Tig list - http://tig.oktobor.com/mailman/listinfo/tig
TIG wiki: http://tig.colorist.org/wiki

_______________________________________________
Tig list - http://tig.oktobor.com/mailman/listinfo/tig
TIG wiki: http://tig.colorist.org/wiki




More information about the Tig mailing list