Xref: utzoo sci.electronics:3906 rec.audio:8455
Path: utzoo!utgpu!attcan!uunet!pyrdc!pyrnj!rutgers!mcnc!unccvax!dya
From: dya@unccvax.UUCP (York David Anthony @ WKTD, Wilmington, NC)
Newsgroups: sci.electronics,rec.audio
Subject: Re: Looking for Blue LEDs
Keywords: blue blue blue, not yellow or red or green
Message-ID: <1128@unccvax.UUCP>
Date: 23 Sep 88 13:28:16 GMT
References: <1138@nmtsun.nmt.edu> <862@ritcv.UUCP> <255@rna.UUCP> <4422@lynx.UUCP> <871@ritcv.UUCP>
Organization: Univ. of NC at Charlotte, Charlotte, NC
Lines: 18

In article <871@ritcv.UUCP>, cep4478@ritcv.UUCP (Christopher E. Piggott) writes:

> Question: why are R.G.B. monitors Red, GREEN, blue, when GREEN is not one of
> the primary colors (being a combination of blue and yellow)?  Why shouldn't
> it be red, YELLOW, blue?

	Actually, you are thinking about pigmented primary colour systems, not
optical additive primary colour systems.  The RGB primaries represent the maximum
span (and define a "triangle" on the CIE colour chart, a 2-d representation of
colour space) of reproducible colours.  Colours outside the "span" cannot be
reproduced.

	Check out any decent book on physical psychology, Cornsweet's classic
text "Visual Perception", or the half-zillion books published on this subject
in the 50's w.r.t. colour TV.

York David Anthony
DataSpan, Inc