Return-Path: 27 Aug 91 10:35:59 +1200 Message-Id: To: lojban-list@snark.thyrsus.com From: "Chris Handley" Date: 27 Aug 1991 10:34:52 GMT+1200 Subject: Colours Reply-To: cbmvax!uunet!otago.ac.nz!chandley X-Mailer: Pegasus Mail/Mac v1.03 Status: RO X-From-Space-Date: Mon Aug 26 19:14:36 1991 X-From-Space-Address: cbmvax!uunet!gandalf.otago.ac.nz!CHANDLEY Hi, Mostly I just sit and watch the controversies fly past, but evry now and again I feel obliged to add my pennyworth. Dave writes that he has restored indigo to his vocabulary and thereby increased his perceptions of the blue end of the spectrum. However, he then gets a trifle confused between violet and purple. If one looks at the CIE diagram (any half way decent reference work on Colour Theory, Image Processing or Computer Graphics should contain one), then the spectral colours (including violet) lie around the periphery, whereas the purples lie on the straight line joining the blue and red ends of the curve. They are niot spectral colours, but because we cannot see further than red and violet, we pretend there is nothing beyond them, so purples are called 'pseudo- spectral' colours, just to close the diagram off. I also agree with one of the other posters, cyan amd magenta are vitally important colour concepts and words for them must be tightly pinned down. However do not paint yourself into the traditional three-colour corner, that way madness lies. Chris Handley Chris Handley Dept of Computer Science chandley@otago.ac.nz University of Otago Dunedin, NZ