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From: thomas@utah-gr.UUCP (Spencer W. Thomas)
Newsgroups: net.micro.mac
Subject: Re: Macintosh advertising - blue screen
Message-ID: <1665@utah-gr.UUCP>
Date: Fri, 31-Jan-86 13:17:07 EST
Article-I.D.: utah-gr.1665
Posted: Fri Jan 31 13:17:07 1986
Date-Received: Sat, 1-Feb-86 21:37:41 EST
References: <474@kepler.UUCP>
Reply-To: thomas@utah-gr.UUCP (Spencer W. Thomas)
Organization: Univ of Utah CS Dept
Lines: 11
Keywords: Macintosh, ads, blue screen

Most black & white monitors (including B&W TV sets) actually emit much
more light at the blue end of the spectrum than at the red end.  You can
usually see this by holding a white card up next to the display (with
the card illuminated by DAYLIGHT (tungsten light will make it look even
bluer)).  The display looks significantly bluer (or "colder") than the
card (or, alternatively, the card looks "warmer" than the display).
Film is much more sensitive to the excess blue energy than is the
human eye, thus color photographs of a B&W CRT tend to look blue.

-- 
=Spencer   ({ihnp4,decvax}!utah-cs!thomas, thomas@utah-cs.ARPA)