[FoRK] Breakthrogh in HDTV projector pricing

Dave Long dl at silcom.com
Wed Jul 21 14:14:53 PDT 2004

> I haven't read up much on the subject, but apparently the screen will 
> only reflect back red, green, and blue wavelengths in very narrow bands 
> and otherwise mostly absorbs other light. So if the projector's color 
> wheel filters or whatever means it uses to generate RGB doesn't 
> precisely match the screen characteristics it will not perform perfectly.

I was under the impression that color
encodings for broadcast were based on
human eye response, which would imply
everyone's projectors would be using
the same RGB frequencies. *

Are there economic (or legal) reasons
to use different sets of primaries?

* NTSC, PAL/SECAM, and SMPTE look like
they pretty much agree on R,B,W, with
only NTSC G showing much variation.

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