I am currently making a tutorial video and needed to create a diagram. As I was doing it I remembered a post a week or so ago about “Support for Disabled Users”, so I decided to see if I could find a palette for the diagram that would be suitable for people with colour blindness (or colour deficiency) as well as those with normal vision. There are several such pallettes, in the end I chose the one developed by IBM.
Too many times we happily create diagrams that to us look vibrant, but to the 1 in 12 to 1 in 25, depending on ethnicity, who are colour blind many of these diagrams are unusable as the colours, that are meant to impart information, canot be differentiated by them. The following diagram shows how the spectrum of colours is perceived by people with the 3 main types of color blindness and it obvious to see why normal colour palettes are a problem for them and I’d encourage you to think about these issues too when using colours to represent information.
The IBM palette is shown below (other palettes are also available):
and this is a simulation of what it looks like (Coloring for Colorblindness):