blue/purple) as they can give your overall image a visually appealing cohesive look. Red-green blind software developer Peter Cardwell-Gardner tells me: “It may be tempting to choose colors near each other (e.g. You might wonder: “Complimentary colors like blue and orange? Is this necessary?” Well, it does help. Blue-blind readers as teal ⬤ and pink ⬤/ ⬤.Green-blind readers as blue ⬤ and orange ⬤/ ⬤.Red-blind readers will perceive it as blue ⬤ and olive ⬤/ ⬤.If you do need multiple colors, the safest choice is to mix blue ⬤ with orange or red ⬤/ ⬤: “Blue is the safest hue.” If you want red- and green-blind readers to perceive color as you do, choose blue. Note that the color that looks the most the same for people with normal vision and readers with red-/green-blindness (the most common types of colorblindness) is blue. Here’s another view on the same dilemma, this time with the color wheels we met last time: If you’re a fan of green, here is bad news: In a chart that you want to be readable by colorblind people, you can neither combine green with orange/red nor with blue of the same lightness: Let’s start! Everything you can use to make your charts and maps decipherable for colorblind readers Blue (and orange) I already included a few of their statements in this week’s article. You’ll learn if/how they perceive their colorblindness as an inconvenience in daily life and when reading (or designing!) charts and maps. In the third article, you’ll hear from then colorblind data visualization enthusiasts themselves, like our Datawrapper CEO David. Ask colorblind people 3 What’s it like to be colorblind That’s the article you’re currently reading! It covers a lot, so here’s an index of everything you can use to make your charts and maps decipherable for colorblind readers:ġ3. 2 What to consider when visualizing data for colorblind readers It also explains in detail which color combinations are tricky to distinguish for your colorblind readers. The first article – published last Wednesday – is about why you should care about your vision-deficient readers, and what’s the difference between colorweakness and colorblindness. This article is part of a three-part series on colorblindness: 1 How your colorblind and colorweak readers see your colors Not just for people with a color vision deficiency, or the older ones, or the ones that read your chart in low light – for everyone. Most of the advice here will make your charts easier to read. Using these ideas in your next chart or map can make all your readers happy: They simply aim at making it more likely that readers can tell apart differently colored elements. Half of the options have little to do with color: We’ll talk about labels, hover effects, symbols, shapes, and patterns. It includes ideas to design colorblind-safe data visualizations. Choosing colors for your visualizations is hard, choosing colorblind-safe colors is harder.
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