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Digital Accessibility: Did You Know?
Color Contrast
By Kendra Guffey
Did you know that color contrast measures how visually distinct two colors appear? It plays a crucial role in accessibility, making it easier for people with low vision or color blindness to see and understand content.
You might be surprised to find out that what looks like good contrast to you may not meet accessibility standards. It can be challenging to recognize if you don't have any visual impairments or disabilities. Insufficient contrast makes text difficult to read which creates barriers. Color contrast also impacts graphs, logos, and images.
According to the Web Content Accessibility Guidelines (WCAG), regular text should have a contrast ratio of at least 4.5:1 for Level AA compliance, while Level AAA requires at least a 7:1 ratio. For reference, black on black has a contrast ratio of 1:1, while black on white has the highest contrast possible of 21:1.
Even though logos are not required to meet contrast standards, designing with strong contrast makes them more visible and inclusive. Want to check your color contrast? Tools like TPGi’s Colour Contrast Analyzer (CCA) can help ensure your designs are accessible. Learn more by visiting the Color Contrast page on the Illinois Department of Innovation & Technology website. Enhancing color contrast benefits everyone—because when content stands out, so does your message!
Take a look at the contrast comparison of the text "A New Legacy," located at the bottom of the Space Jam poster— one viewed with normal vision and the other simulating a bright light vision impairment. This demonstrates why aiming for a higher contrast ratio is essential for accessibility.
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