Mapnik 3.0.12 Release Sep 08, 2016 | Artem Pavlenko
Mapnik 3.0.10 Release Feb 29, 2016 | Artem Pavlenko
Node Mapnik 3.5.0 Release Feb 29, 2016 | Sam Matthews
Mapnik 3.0.9 Release Nov 26, 2015 | Artem Pavlenko
Mapnik 3.0.7 and 3.0.8 Releases Oct 26, 2015 | Artem Pavlenko
Mapnik 3.0.6 Release Oct 08, 2015 | Artem Pavlenko
Mapnik 3.0.5 Release Sep 17, 2015 | Artem Pavlenko
Mapnik 3.0.4 Release Aug 26, 2015 | Artem Pavlenko
Introducing a Color Blind Filter Aug 14, 2015 | Blake Thompson
Mapnik 3.0.3 Release Aug 12, 2015 | Artem Pavlenko
Mapnik 3.0.2 Release Jul 31, 2015 | Blake Thompson
Node Mapnik 3.4.1 Release Jul 31, 2015 | Blake Thompson

latest news

Introducing a Color Blind Filter

Aug 14, 2015

I was prompted by reading this conversation recently about color blind maps. I realized suddenly that we don’t support a way for our cartographers to easily design maps that would be easy to view by a color blind individual. Determined to change this, I quickly dashed off to my development batcave!

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After some quick research I found a research paper on colour blindness. After quickly deducing that color should be spelled with out a u, I proceeded to throw together an algorithm. (Artem thinks it spelled with a u)

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I emerged from the bat cave with some new code in Mapnik. Image filters for three types of color blindness.

  • Protanopia (1% of males) – filter: color-blind-protanope
  • Deuteranopia (1% of males) – filter: color-blind-deuteranope
  • Tritanopia (less than 1% of males and females) – filter: color-blind-tritanope

So here are some maps with the color blind filters!

Original Wheat Paste

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Protanopia Wheat Paste

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Deuteranopia Wheat Paste

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Tritanopia Wheat Paste

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If all those maps look the same to you, you might be color blind.















Okay I lied, here are the real ones.

Original Wheat Paste

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Protanopia Wheat Paste

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Deuteranopia Wheat Paste

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Tritanopia Wheat Paste

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These image filters are now released in mapnik 3.0.3 and node mapnik 3.4.3!

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