Published on February 28, 2014
Making Colors Visible for ALL @MaryamAshoori Feb 2014
Different readings of the same color
We perceive what we expect. Our perception is biased by our experience, the context, and our goals. “In visual perception a color is almost never seen as it really is[…] This fact makes color the most relative medium in art.” Joseph Alberts, Interaction of Color, 1963
Let‟s get back to our „RED‟ square
99% of all colorblind people are redgreen color blind "Red-green" color blindness is observed among one out of twelve Caucasian (8%), one in 20 Asian (5%), and one in 25 African (4%) males.* * http://jfly.iam.u-tokyo.ac.jp/color/
Red-green color blind Non color blind Deuteranope (green cone cells defective)
Why does that matter? 1 in 12 men (8%)* * NHS Choices 1 in 200 women (0.5%)
Step 1: Test if you are color blind Take the online test: http://www.color-blindness.com/ishihara-38-plates-cvd-test/ What People With Regular Vision See *.Ishihara Test for Color Blindness What Red-Green Color Blind People See
Step 2: Test if your computer is color blind Test for computer color accuracy http://goo.gl/lJi5bk Example: *.Ishihara Test for Color Blindness
Step 3: Test your design for color accessibility • Colorblind Simulator http://aspnetresources.com/tools/colorBlindness • Colorblind Web Page Filter http://colorfilter.wickline.org/ • Vischeck http://www.vischeck.com/vischeck/vischeckImage.php • Accessibility Validation in Photoshop • WAVE http://wave.webaim.org/ • Sim Daltonism (for Mac) http://michelf.ca/projects/sim-daltonism/ • Contrast-A: Accessible Color Combinations http://www.dasplankton.de/ContrastA/
Print a copy of the screen in black and white to verify color is not the only way to identify or distinguish information. *. IBM Software Accessibility Checklist
Step 4: Follow the color accessibility guidelines • Web Content Accessibility Guidelines (WCAG) 2.0 Guideline 1.4 : http://www.w3.org/TR/WCAG20/#visual-audio-contrast • Your company‟s Software Accessibility Checklist • Color Universal Design Organization (CUDO) http://jfly.iam.u-tokyo.ac.jp/color/
Make texts and objects as THICK or BIG possible. as
Example: Choosing the wrong colors for a chart can make it literally unreadable for a colorblind user. 6 4 2 Series 1 Series 3 Add a little pattern or texture to different parts of a chart to make for easier visual differentiation. 6 4 0 2 0 Series 1 Series 3
Example: When designing forms, avoid labeling required fields only with colored text
Colorblind barrier-free color palette * http://jfly.iam.u-tokyo.ac.jp/color/
Avoid using pure red Use vermilion or orange instead (255,0,0) (213,94,0) (230,159,0)
Avoid using pure green Use Bluish Green instead (0,255,0) (0,158,115)
Avoid combination of colors with low saturation or low brightness.
Colorblind users can perceive brightness shifts Non colorblind Protanopia-type
Avoid the situation where texts and objects are obscured with the background. Hi There! Non colorblind Deuturanopia-type
Keep the number of colors to a minimum Use combinations of different symbols with a few, vivid colors rather than a single symbol with various colors.
When color matters, include color names and show examples *. H&M
Avoid using complicated color names *. Banana Republic
What if the hover doesn‟t work? *. Gap.
Avoid color-specific instructions Click the green button to purchase! Label your buttons clearly and reference them in the site copy by function, not color, to avoid confusion. Amazon.ca
• When color customization is supported, provide a variety of color selections capable of producing a range of contrast levels.
Related resources from WCAG 2.0 guidelines : • • • • • • • • • • Lighthouse International: Effective Color Contrast Vischeck Internetworking: Designing for the Color-Challenged: A Challenge AWARE Color Laboratory Colorblind Web Page Filter Firelily Designs: Color Vision, Color Deficiency Wikipedia: Color Blindness Microsoft: Can Color-Blind Users See Your Site? BT Inclusive Communication: Choosing safe colours Causes of Color: How do people inherit colorblindness? How often?: Genetics • How to make figures and presentations that are friendly to Colorblind people • The Color Tutor application
Making Colors Visible for ALL @MaryamAshoori Feb 2014
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