[Tig] LUTs for Video File Codecs - ICC profiles

Adrian Thomas adrian
Thu May 4 10:29:10 BST 2006

Thanks to oktobor for supporting the TIG
There is no 'computer standard whitepoint' as such, the closest that  
we have to any kind of standard is sRGB, which mandates D65, and is  
LOOSELY compatible with our TV expectations of Rec. 709.

In the real world where monitors are never going to be calibrated,  
the best we can do is to work with the pre-press derived ICC device  
colour profile system assuming sRGB compliance for desktop displays.  
Both the benefit and disadvantage of sRGB is its limited gamut - so  
even cruder devices should be able to meet the standard in typical  
viewing conditions and set at factory defaults.

Adrian Thomas
Automatic Television
35 Bedfordbury
London WC2N 4DU

On 4 May 2006, at 10:10, glenn chan wrote:

> C- No calibration.  The decoding/interpretation of the analog VGA  
> signal may
> change over the monitor's life... the monitor will need to be properly
> calibrated to reflect this.  However, many monitors lack the bias  
> controls
> (sort of like black level for each R, G, B channel) necessary to do  
> this...
> so you end up with something like reddish blacks.
> Some monitors also can't change their white points.  I believe the  
> computer
> standard white point is 9300K.  Television/broadcast is D65, except in
> Japan.  Even after adaptation, there is a noticeable difference  
> between the
> two white points... some consumer TVs implement "red push" to try to
> compensate (they oversaturate the reds).

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