While organizing my colour tools, I thought of sharing a few of them here, some I’ve used, some new to me. The truth is that I intend to get better at it and it was prompted by a 2015 piece by Elijah Meeks that hit close to home:
So if that applies to you as well, I’ll start with five basic tools.
The reference in colours for maps and more. It’s on every list. The interface is a bit dated by today’s standards, but it’s incredibly convenient, with options for colour-blind palettes, or even photocopy-safe ones. Why Cynthia Brewer has barely 1200 followers on Twitter is a mystery to me (well, she doesn’t tweet much).*
Picking a colour scale with constant changes along the gradient is complicated by our non-linear perception of colours. The Color Brewer addresses this problem and Gregor Aisch takes it a step further by allowing us mere mortals to create our own properly-scaled multi-hue scale. It has quickly become an essential resource. It’s worth reading the thinking behind it and checking the color picker developed on top of it by Tristan Brown.
Not everything in data visualization is about a perfect gradient or diverging palette. Many graphs require simply a pleasant palette. Looking at popular palettes from around the world can be inspiring.
This tool acknowledges that a colour scheme has a main, a secondary and accent colours, unlike other tools that treat all colours in a palette as equal. Trigger alert: painful interface.
There you go, with fewer excuses for using the default colour palette of your favorite dataviz tools.
*Because we Canadians pride ourselves on our humility yet brag about any famous Canadian, I’ll mention that Cynthia Brewer is Canadian. Also, Drake and the present use of the British spelling “colour”.