baptiste auguie <baptiste.auguie <at> googlemail.com> writes: > Replying to myself here, > Hadley pointed out this website on the ggplot2 mailing list, > > http://colororacle.cartography.ch/ > > And this seems like a more straight-forward solution to my query > (albeit not using R). It sort of makes sense to momentarily alter the > computer display rather than parse the code for colour and fill > regular expressions... > 2009/9/28 baptiste auguie <baptiste.auguie <at> googlemail.com>: > > Dear list,
> > The dichromat package defines a dichromat function which "Collapses > > red-green color distinctions to approximate the effect of the two > > common forms of red-green colour blindness, protanopia and > > deuteranopia." > > All the best, > > > > baptiste Just to point out a fact or two with respect to the information on the indicated web page and a statement above. While roughly 8% of males are classified as color-deficient by standard tests, as indicated at the site to which the link points, only about 2% are actually dichromats, i.e., protanopes and deuteranopes, referred to above as "common forms", and to which the dichromat package is directly relevant. Dichromatic vision is reduced to 2 dimensions from the normal 3. Most of the other 6% (i.e., the most common forms) are what are termed anomalous trichromats and to whom the renditions of the dichromat package are not actually appropriate, as the color spaces of such observers are not a subspace of that of a normal observer. Such individuals really see the world a bit differently, as they may very well call something as red that a normal observer would call green or vice versa depending what kind of anomalous trichromat one is. So, strictly speaking, the dichromat package is of great value in avoiding color choices that about 1% of the population would have trouble discriminating. Ken -- Ken Knoblauch Inserm U846 Stem-cell and Brain Research Institute Department of Integrative Neurosciences 18 avenue du Doyen Lépine 69500 Bron France tel: +33 (0)4 72 91 34 77 fax: +33 (0)4 72 91 34 61 portable: +33 (0)6 84 10 64 10 http://www.sbri.fr/members/kenneth-knoblauch.html ______________________________________________ R-help@r-project.org 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.
