Power BI Accessibility Features – Color Selection

There are many different types of color vision deficiencies exist, from an inability to see the difference between one common color pair such as red-green (the most common deficiency), all the way to full color blindness where a person can see only varying shades of gray and black.

Additionally, since color vision deficiency can also manifest as an inability to distinguish between title, axis label, and data label text, font and background, overall color design of all screen elements must provide a large amount of contrast. You should strive to achieve a minimum of a 4.5:1 color luminosity contrast ratio as suggested by WCAG 2.1.

Furthermore, you must not create any visualizations that provides key information by color alone. Such as not designated negative numbers solely by coloring the text red or include a minus sign or parentheses to denote negative numbers in tables and pivots.

Power BI has some built-in themes to help make your report more accessible themes such as “Color blind safe”, “High Contrast”, but it’s best practice to check your report with some of the additional tools:

  • This site offers a tool that can test for the proper level of contrast:

http://www.paciellogroup.com/resources/contrast-analyser.html

  • This site offers a tool for viewing how a web site is displayed for individuals with various types of color vision deficiency:

http://colorfilter.wickline.org/

Moreover, users with low visual acuity often use some kind of a screen magnification software to make the screen easier to read. The fonts that you use should be readable even when magnified by accessibility tools by as much as 20 times. Keep in mind some fonts do not display well when magnified, while others do such as the Tahoma font magnifies pretty well.

 

Interested in custom designed high quality Accessible Power BI reports?  Anyon ConsultingPower BI Consulting group can help.  Contact us today to learn more about our  Custom Report Development

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