Hi All, Complementary colors will not insure legibility. If the text and the background are equiluminant, visibility will be severely impaired.
On May 21, 2007, at 8:22 PM, John Fox wrote: > Dear Achim, > > As I mentioned in my response to Deepayan's suggestion, I didn't > specify the > original problem clearly: The object is to get contrasting colours, > so that > when one is plotted over the other, the two will be readily > distinguishable. > Your suggestions don't do this for neutral colours: > >> x <- "#888888" >> y_hcl <- as(hex2RGB(x), "polarLUV") >> [EMAIL PROTECTED], "H"] <- [EMAIL PROTECTED], "H"] + 180 >> hex(y_hcl) > [1] "#888888" > >> y_hsv <- as(hex2RGB(x), "HSV") >> [EMAIL PROTECTED], "H"] <- [EMAIL PROTECTED], "H"] + 180 >> hex(y_hsv) > [1] "#888888" > > Thank you for trying to help. > > John > > -------------------------------- > John Fox, Professor > Department of Sociology > McMaster University > Hamilton, Ontario > Canada L8S 4M4 > 905-525-9140x23604 > http://socserv.mcmaster.ca/jfox > -------------------------------- > >> -----Original Message----- >> From: Achim Zeileis [mailto:[EMAIL PROTECTED] >> Sent: Monday, May 21, 2007 7:07 PM >> To: John Fox >> Cc: r-help@stat.math.ethz.ch >> Subject: Re: [R] Selecting complementary colours >> >> On Mon, 21 May 2007, John Fox wrote: >> >>> Dear r-helpers, >>> >>> I wonder whether, given the "#rrggbb" representation of a colour, >>> there is a simple way to select the complementary colour, >> also expressed as a "#rrggbb" >>> string. >> >> Is the complementary color uniquely defined? My understanding >> is that you can take opposite colors on a color wheel, but >> there are of course various color wheels available. With >> "colorspace" you can experiment with this, >> e.g.: >> x <- "#81A9D0" >> y_hcl <- as(hex2RGB(x), "polarLUV") >> [EMAIL PROTECTED], "H"] <- [EMAIL PROTECTED], "H"] + 180 >> y_hcl <- hex(y_hcl) >> which is a bit more balanced than >> y_hsv <- as(hex2RGB(x), "HSV") >> [EMAIL PROTECTED], "H"] <- [EMAIL PROTECTED], "H"] + 180 >> y_hsv <- hex(y_hsv) >> >> hth, >> Z >> >> >> > > ______________________________________________ > R-help@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting- > guide.html > and provide commented, minimal, self-contained, reproducible code. _____________________________ Professor Michael Kubovy University of Virginia Department of Psychology USPS: P.O.Box 400400 Charlottesville, VA 22904-4400 Parcels: Room 102 Gilmer Hall McCormick Road Charlottesville, VA 22903 Office: B011 +1-434-982-4729 Lab: B019 +1-434-982-4751 Fax: +1-434-982-4766 WWW: http://www.people.virginia.edu/~mk9y/ ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
