Color-blind people are your audience too!
Posted by Helena Jambor, on 27 April 2017
Or, please stop mixing green/red
Color is a key aspect of graphic design, but for many years was not relevant for scientific figures that were largely black and white. Falling prices for color print and electronic publishing changed this dramatically and scientists now frequently produce multi-colored figures. Using color functionally is not always straightforward but few rules exist: do not combine red and green!
Already in 1939 Willard Brinton advised his readers to not use red letters on a green background as they become invisible to color-blind people (and are hideous for the rest of us!). [his great book on data visualization is available for free here]. A century later, when browsing through figures in scientific periodical, this message has not reached everyone.
In charts, it is very straightforward to avoid mixing red and green. If you want to use red, combine it with blue or cyan, if you want to use green, combine it with magenta or orange. That way also color blind people can distinguish the data points. A side note: try starting a chart in black and white, and only add color if absolutely essential.
In laser-microscopy green and red fluorophores are widely used, often in combination. But: Simply because a wavelength of your fluorophore is 488nm this does not mean you have to use green for its display! The camera output doesn’t have color anyway, so you are at liberty to choose a suitable lookup table. Why not be color-blind friendly and choose colors visible to your entire audience. Options that still preserve a little information on the wavelength are green/magenta or cyan/red.
Again, consider if two black and white images instead of a composite color. In fact, the contrast is usually higher in greyscale which benefits the display of structure details and subtle intensity differences.
*Rm62 RNA in Drosophila egg chambers part of my postdoc project, find more subcellular RNAs on the Dresden Ovary Table.
Helpful tools:
- Test color-blind visibility for your images here
- Choose color for categorical, quantitative and diverging data in charts using color-brewer.
Comments suggesting more tools very welcome!
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In 2016, the BSDB introduced the 
Jenny’s main research interests are the mechanisms that establish and maintain pluri-potency in the early embryo and during the formation of embryonic stem cells in mammals. She also uses animal models to understand defects which lead to type 1 diabetes. Jenny started her career at Oxford University where she worked as a research assistant to Prof. Richard Gardner (1981-90). In 1990 she moved to the University of Edinburgh to carry out her PhD project in the group of Prof. Austin Smith. She obtained her PhD in 1995 for her thesis entitled ‘A Study of the Expression and Function of Differentiation Inhibiting Activity and its Receptor in the Early Mouse Embryo‘. She stayed as a post-doctoral research fellow in the group of Austin Smith in Edinburgh, until she became a group leader at the Wellcome Trust-MRC Stem Cell Institute of the University of Cambridge, where she has stayed since then.
Bill is Canadian, but underwent his scientific education and early career in the U.S., where he did his B.A. in Biophysics (University of California, Berkeley; 1972), his Ph.D. on “Color vision in Drosophila” in the group of Seymour Benzer at the California Institute of Technology (Pasadena; 1972-76), carried out his postdoctoral research in the laboratory of David Hubel and Torsten Wiesel at the Dept. of Neurobiology, Harvard Medical School (1976-80), and joined the faculty of the Dept. of Biology, University of California (San Diego; 1980). He remained in San Diego until 1997, when he moved to the UK to take on a position as Professor of Anatomy at the University of Cambridge and, since 1999, Head of the Department of Anatomy (which became the Department of Physiology, Development and Neuroscience in 2006).
