colour maps

The perfect lead into my series on perceptual color palettes. Great post!

The original article on the Guardian is here. And here is the conversation that lead to improved map, as put together on Storify.

I thought it’d be interesting to run a simulation of what the map would actually look lie to viewers with the 3 types of color deficient vision. Below are my results for the first map. It is obvious from this simulation that while the map is OK for Tritanope viewers, the green and red areas are very confusing for Protanope and Deuteranope viewers.

The second map instead passed the simulation tests. Here I am showing the original at the top and the  Deuteranope simulation at the bottom.

All simulations were done using the Dicromacy plugin for ImageJ. With Vischeck you can do the same with webpages.

Colour chat

Last year a student, Kaori, from Japan spent some time with me at Leeds and we spoke a lot about how to use colour effectively in maps and in urban design generally. One of the issues we were looking at was whether the maps’ features would be discriminable to colour-blind observers (of which, of course, there are many). So I was interested to come across an interesting article today relating to this very issue.

Apparently the following image appeared in the Guardian newspaper:

It’s a colour-coded map of London. It shows areas of deprivation with red being the most deprived. It met with much criticism, however, and many people said they had difficulty in discriminating between the colours. Of course, colour-blind observers most commonly have difficulty discriminating in the red-green region of colour space. The company who made the map engaged in a debate with users on twitter and created…

View original post 37 more words

4 responses to “colour maps

  1. Wow! That’s something useful to know. I don’t know that this crosses our minds nearly as often as it should. How important it is to remember to see things from different points of view.

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