Making presentations that are friendly to colorblind people

Recently I stumbled upon excellent page with the following title:

How to make figures and presentations that are friendly to colorblind people, by Masataka Okabe, Jikei Medial School (Japan) and Kei Ito, University of Tokyo, Institute for Molecular and Cellular Biosciences (Japan)

3(+1) principles of Color Universal Design

1. Choose color schemes that can be easily identified by people with all types of color vision, in consideration with the actual lighting conditions and usage environment.
2. Use not only different colors but also a combination of different shapes, positions, line types and coloring patterns, to ensure that information is conveyed to all users including those who cannot distinguish differences in color.
3. Clearly state color names where users are expected to use color names in communication.
4. Moreover, aim for visually friendly and beautiful designs.

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