Message-ID: <obcgo0lk042qeljgc5jrfcn99s0jplu33m@4ax.com>
Date: 2004-11-03T01:23:29Z
From: Duncan Murdoch
Subject: Color schemes that work for people with color-deficient vision
In-Reply-To: <200411022104.iA2L4mF19027@snow.pnl.gov>
On Tue, 02 Nov 2004 13:04:48 -0800, Scott Waichler
<scott.waichler at pnl.gov> wrote:
>A recent article in the earth science literature cited below and available at
>http://geography.uoregon.edu/datagraphics/EOS/
>points out that rainbow color schemes and mixtures of green and yellow
>can be troublesome for people with color-deficient vision.
>The authors propose alternative schemes that can be viewed and downloaded
>in RGB, HSV, CMYK, and RGB256 formats from
>http://geography.uoregon.edu/datagraphics/color_scales.htm.
>I have translated their RGB definitions into the hex color names given below.
Thomas Lumley has just written a couple of functions that make
experimentation with scales like this a lot easier. They're currently
in R-devel, and will appear in R 2.1.0 next spring. If you want to
play with them before that, you can get the source and the docs from
https://svn.r-project.org/R/trunk/src/library/graphics/R/colorRamp.R
and
https://svn.r-project.org/R/trunk/src/library/graphics/man/colorRamp.Rd
Duncan Murdoch