David Pietersen wrote:
Mordechai is totally right in that it is hue that makes it difficult,
but it is only within the specific context of combining the two (either
Red/Green or Blue/Green).
I had a series of progressively more advanced CB tests when I went to
join the Army, and ended up with a rating of 19, with 20 being the worst
(on their scale anyway). I can totally see the difference between Red
and Green, and in 99.9 percent of the time it makes no difference to
anything. The only time I notice it is when someone wants me to look at
the pretty red bird sitting in the green tree (unless it moves, I will
NEVER find it), or once when I was driving past a field everyone wanted
me to stop and take photos and it took me 10 mins to work out it was an
apple orchid in full bloom- all I could see was a bunch of boring
trees. The reason you can't be an electrician is that if there is a red
wire in a bundle containing a lot of green ones, there is little chance
you would see it.
I can't ever recall a website that caused me grief. If I have come
across one, it would have still been usable for me, I just would not see
it that same way as the author.
dp.
This is a site I always show people to illustrate red/green colour
blindness:
http://centricle.com/ref/css/filters/
I find it extremely difficult to tell the red cells from the green
cells. I think it's a good example of how not to use red and green - ie
together and in small areas. The site's still usable (although less
usable for me than normal sighted people), but if it relied *only* on
red and green to signal differences, it would be just able unsuable.
Mike
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