[opendtv] Re: New Chips Improve Color TV Dramatically

At 4:17 AM -0700 6/24/04, Mike Enright wrote:
>The gamut of CMYK printing is narrow and it is difficult to convert
>pretty much any richly-colored material without loss of color fidelity.
>I have seen printed results from using extra primaries in print (on some
>really amazing printing paper by the way), though, and the only really
>impressive result was when the algorithm was repurposed to use fewer
>primaries, chosen by optimization, to get a more accurate and more
>satisfying image than CMYK would give. And realistically, none of the
>results would be worth the trouble to anyone but a fine artist. So the
>opportunity for improvement was huge, but the results were underwhelming.

CMYK is to print as NTSC encoding is to Video. It is a time tested 
way of producing "natural dithered imagery" on paper. It falls short 
in any applications where you need distinct lines of a specific color.

The use of spot color to overcome the limitations of CMYK has grown 
significantly in recent years. Many of the new direct-to-press 
technologies make it quite simple to set-up large jobs with six 
colors or more.

>
>Cirling back to the present matter, for a more-than-3-color technique to
>provide improvement, the source material must have a gamut larger than
>the display would have had with 3 primaries. Perhaps a one-chip LCOS
>with 3-color wheel (or scroll?) has a smaller gamut than MPEG 2? Why
>would that be? I can't think of anything.

I don't think that display gamuts are the problem, unless they are 
phosphor based, like plasma. In reality any of the new micro 
projection displays have the ability to support extended color 
gamuts, since they are not limited by the need to find appropriate 
phosphors. Color wheel devices actually do a very good job with 
extended color gamuts. The limitation is almost always at the source. 
This may be the result of assumptions about gamma, and/or, the 
limitations of the color encoding space. MPEG-2 is notoriously 
limited by the choice of colorimetry and the lack of color resolution 
for interlaced video.

Regards
Craig
 
 
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