[Tig] LUTs for Video File Codecs

Jack James jack
Tue May 2 22:40:17 BST 2006


--
Thanks to oktobor for supporting the TIG
--
Perhaps a 4D LUT would do it?
Now we just need to wait for someone to invent one.

-----Original Message-----
From: tig-bounces at tig.colorist.org [mailto:tig-bounces at tig.colorist.org] On
Behalf Of Dan C. Tatut
Sent: 02 May 2006 21:51
To: Tim Montgomery; tig at colorist.org; tig-bounces at tig.colorist.org
Subject: RE: [Tig] LUTs for Video File Codecs

--
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



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




More information about the Tig mailing list