New Map Scale Is More Readable by People Who Are Color Blind • Hacker News Board

Re: New Map Scale Is More Readable by People Who Are Color Blind

#11

Post by close04 » Fri, Aug 10, 2018, 11:39 AM UTC

dzdt wrote: post #10

Did I miss it, or are there zero example images in the article using the new color scale?

The yellowish/blueish diagrams are the new scale. https://static.scientificamerican.com/sciam/assets/Image/jou...

I always hated rainbow scales because I always see artificial boundaries where the colors change between 2 contrasting ones.

Re: New Map Scale Is More Readable by People Who Are Color Blind

#12

Post by kozhevnikov » Fri, Aug 10, 2018, 11:52 AM UTC

masklinn wrote: post #8

Related: How Bad Is Your Colormap? (Or, Why People Hate Jet – and You Should Too): https://jakevdp.github.io/blog/2014/10/16/how-bad-is-your-co... Also related: seaborn (a helper library on top of matplotlib) has a special case dedicated to rejecting requests for using jet

Why is it called jet? Can't find any definition/abbreviation for it beside that it's called jet in MATLAB.

https://www.mathworks.com/help/matlab/ref/jet.html

Re: New Map Scale Is More Readable by People Who Are Color Blind

#13

Post by toomanybeersies » Fri, Aug 10, 2018, 11:54 AM UTC

I've been using Color Oracle [1] to simulate colour-blindness as part of my standard developer workflow recently. For such a common disability, it's shocking how little work most people put into ensuring accessibility for colour-blind people.

[1] https://colororacle.org/

Re: New Map Scale Is More Readable by People Who Are Color Blind

#14

Post by sbr464 » Fri, Aug 10, 2018, 12:08 PM UTC

I added a basic React component that also has the values in RGB computed

https://github.com/sbrichardson/react-cividis/blob/master/RE...

Re: New Map Scale Is More Readable by People Who Are Color Blind

#15

Post by Matumio » Fri, Aug 10, 2018, 12:20 PM UTC

lurquer wrote: post #2

I wish the article would have provided the formula for cividis... that is, how to transform a range of values from 0 to 1.0 into standard RGB values.

I was looking for a table too, and found https://github.com/pnnl/cmaputil (colormaps/ directory)

Re: New Map Scale Is More Readable by People Who Are Color Blind

#16

Post by sbr464 » Fri, Aug 10, 2018, 12:25 PM UTC

Here are the RGB values converted from the Matlab color index format mentioned.

https://github.com/sbrichardson/react-cividis/blob/master/sr...

Re: New Map Scale Is More Readable by People Who Are Color Blind

#17

Post by sbr464 » Fri, Aug 10, 2018, 12:29 PM UTC

lurquer wrote: post #2

I wish the article would have provided the formula for cividis... that is, how to transform a range of values from 0 to 1.0 into standard RGB values.

Here you go https://github.com/sbrichardson/react-cividis/blob/master/sr...

Re: New Map Scale Is More Readable by People Who Are Color Blind

#18

Post by DangerousPie » Fri, Aug 10, 2018, 12:32 PM UTC

Isn't this almost the same as the viridis palette that has been around for ages? https://cran.r-project.org/web/packages/viridis/vignettes/in...

Re: New Map Scale Is More Readable by People Who Are Color Blind

#19

Post by uptime » Fri, Aug 10, 2018, 12:40 PM UTC

http://colorbrewer2.org

“Color Advice for Maps”

Brewer has been on this for a while! Mike Bostock approved. Check “colorblind safe”

Re: New Map Scale Is More Readable by People Who Are Color Blind

#20

Post by ebikelaw » Fri, Aug 10, 2018, 12:50 PM UTC

This advice is also in Tufte’a first book. This bichromatic scale is given as an example. http://photos1.blogger.com/x/blogger/645/100/1600/834939/Tuf...