OT: Color Blind and Maps WAS RE: [Mapserver-users] Maximum Num of Features?

[Lowther, David W]

Antti,

We took an app to a trade show that was based on green roads with a red
selected set - and also a red box draw to zoom in. One of the most
interested people in what we were doing turned out to be color blind. It
wasn't until his road foreman came over and looked at the map that we
realized what was going on. I had honestly never thought of the possibility.
He was completely unable to se the difference and had to take others' words
that there really WERE selected roads...

I guess that changes some cartographic rules, huh?

Dave

-----Original Message-----
From: Antti.Roppola at brs.gov.au [mailto:Antti.Roppola at brs.gov.au] 
Sent: Wednesday, January 29, 2003 8:30 PM
To: ryanne.cruz at up.edu.ph; mapserver-users at lists.gis.umn.edu
Subject: RE: [Mapserver-users] Maximum Num of Features?


Actually, I had a bit of an ulterior motive in posting. The orginal post
reminded me of previous experience where things that looked OK to me were
very difficult for red/green colour blind people to read. Working in a
browser palette would maybe compound that; On the desk next to mine, there's
an Adobe chart of "web-safe colours" that only lists 216 colours.

Antti

Ryanne wrote:

> we were able to make about 7 or 8 classes with different colors and we 
> had no
> problem with it. the problem may not be with the number of classes with 
> different color. 

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