Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!uunet!husc6!hao!ames!amdahl!pyramid!prls!mips!hansen From: hansen@mips.UUCP (Craig Hansen) Newsgroups: sci.misc Subject: Re: Color Message-ID: <1043@mips.UUCP> Date: Thu, 3-Dec-87 21:48:58 EST Article-I.D.: mips.1043 Posted: Thu Dec 3 21:48:58 1987 Date-Received: Wed, 9-Dec-87 02:31:23 EST References: <162300002@uiucdcsb> Lines: 22 In article <162300002@uiucdcsb>, kadie@uiucdcsb.cs.uiuc.edu writes: > 1) On TV's and computers screens, why is it RGB (red, green, blue) > instead of RYB (red, yellow, blue) the primary colors? > > 2) Some light wave length produces the color green. A mixture of > the wave lengths of blue and yellow also produces green. > Even though these two greens are indistinguishable to our eyes, are there > (could there be) instruments that distinguish them? 1) RGB are primary colors for mixing light (eg. red light plus green light gives "yellow" light). When you are mixing paint, remember that paint absorbs light, so mixing red & green paint makes this icky brownish grey, because the mixture absorbs both red and green colors. 2) Simple instruments that will distinguish them are prisms, diffraction gratings, and fog (rainbows). -- Craig Hansen Manager, Architecture Development MIPS Computer Systems, Inc. ...{ames,decwrl,prls}!mips!hansen or hansen@mips.com