From LOJBAN%CUVMB.BITNET@UBVM.CC.BUFFALO.EDU Wed Nov 29 18:11:23 1995 Received: from VMS.DC.LSOFT.COM (vms.dc.lsoft.com [205.186.43.2]) by locke.ccil.org (8.6.9/8.6.10) with ESMTP id SAA20245 for ; Wed, 29 Nov 1995 18:11:20 -0500 Message-Id: <199511292311.SAA20245@locke.ccil.org> Received: from PEACH.EASE.LSOFT.COM (205.186.43.4) by VMS.DC.LSOFT.COM (LSMTP for OpenVMS v1.0a) with SMTP id 2E020464 ; Wed, 29 Nov 1995 18:01:33 -0500 Date: Wed, 29 Nov 1995 14:59:27 -0800 Reply-To: jimc@MATH.UCLA.EDU Sender: Lojban list From: Jim Carter Subject: Re: PLI: property standards X-To: lojban@cuvmb.columbia.edu To: John Cowan In-Reply-To: Your message of "Wed, 29 Nov 95 12:28:46 CST." <9511291831.AA13956@julia.math.ucla.edu> Status: OR "Steven M. Belknap" writes on 951129: > This implies that color *could* (not *must*, *could*!!) be defined by an > external, objective standard, which would be potentially quantifiable on an > interval or ratio scale in intensity and purity... If you're on a UNIX system with X Window System, /usr/lib/X11/rgb.txt contains the definitions of all colors known to X, numerically. In principle the X-server can be set up so that if everyone put a patch of Peach Puff 3 on their screens, all would be getting the same color of light. (But it's hard to set up and some parts are broken, too bad.) The Pantone Book of Color is very useful in non-computer applications as the kind of standard you describe. Also, in humans there are variable numbers of copies of the receptor gene for red (I think it was). 0 copies -> color blind in that channel, but the people doing the research were able to correlate sensitivity variations with copy number even when it was nonzero. Green and blue have one copy each. James F. Carter Voice 310 825 2897 FAX 310 206 6673 UCLA-Mathnet; 6115 MSA; 405 Hilgard Ave.; Los Angeles, CA, USA 90095-1555 Internet: jimc@math.ucla.edu (finger for PGP key) UUCP:...!{ucsd,ames,ncar,gatech,purdue,rutgers,decvax,uunet}!math.ucla.edu!jimc