Colour blindness

[Chris Ball]

Hi,

   > Hi all, I'm not sure this is the right list for this, but I had
   > some feedback on the XO which I'm not sure has been dealt with. The
   > black on green keyboards apparently might be a significant issue
   > for children who are colourblind. I haven't pursued this but had
   > the question posed from an education specialist I'm working with.

   > Has anyone looked at this or have any feedback about it?

The hue of a color changes with colorblindness, but not its intensity --
as long as the green we use is light enough, the worst (and rarest) case
visually would be black on light grey, and much more likely is the green
being perceived as somewhere between a light red and light green
(protanope or deuteranope).  The black keycaps would be perceived very
clearly in all cases.

Here's a useful website that will render a web page as if it were being
seen by a colorblind person:

http://colorfilter.wickline.org/?a=1;r=;l=9;j=1;u=flickr.com/photos/lesliewong/2127314893/sizes/o;t=p

- Chris.
-- 
Chris Ball   <cjb at laptop.org>