[Tig] Colour Correction, telecine or DI.

Bob Friesenhahn bfriesen at simple.dallas.tx.us
Thu Oct 12 17:59:05 BST 2006

Thanks for the excellent explanation.  On the computing side, it seems 
that there is some debate as to whether RGB images should try to 
preserve "video" levels then transforming from SDI-transferred YCbCr 
to RGB.  This is because it is claimed that there may be valuable data 
hidden in the YCbCr below black and above white regions that a video 
engineer or colorist might be able to reclaim.  I argue that if there 
is valuable data there, then the video source must be mis-adjusted and 
the problem is best corrected at the source.

It seems that the RGB transfer issues are more significant than with 
YCbCr.  YCbCr is well defined by video standards but it seems that RGB 
over SDI is not.

Bob Friesenhahn
bfriesen at simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/

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