Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10 5/3/83; site pyuxt.UUCP
Path: utzoo!watmath!clyde!burl!ulysses!gamma!pyuxww!pyuxt!marcus
From: marcus@pyuxt.UUCP (M. G. Hand)
Newsgroups: net.physics
Subject: Re: colors
Message-ID: <161@pyuxt.UUCP>
Date: Mon, 6-Aug-84 22:54:16 EDT
Article-I.D.: pyuxt.161
Posted: Mon Aug  6 22:54:16 1984
Date-Received: Wed, 8-Aug-84 19:26:55 EDT
References: <354@ism780.UUCP>, <3798@brl-tgr.ARPA>
Organization: Bell Communications Research, Piscataway N.J.
Lines: 20

>	There is a pure green spectral line, so it is not a mixture.
>	By the way, mixing blue and yellow light is more likely to
>	give white, light blue, or light yellow than green for most
>	people.

No, no, no!  The hue green can be produced by a single specral emission,
by a narrow band spectrum, a broad band spectrum or by a mixture of
wavelengths which don't include the green spectral line.  The eye and
brain are not sophisticated enough to determine the components of the
hue in isolation, although the purer the light the more intense it
appears (Not "bright", intense - this is a saturation effect because it is
not watered down by other specral emissions.)  The addition of the two
coloured light sources blue and green probably will produce a whitish
hue because most light sources which people have access to have fairly
broad band spectral outputs; ie, its yellow because of the absence of
the blue end of the spectrum rather than any strong yellow spectral
content.  Any book on colour photographic printing will give lots of
good info.

		Marcus Hand	(pyuxt!marcus)