Four years ago, we showed English language speakers random colors and asked for the color names. Four years later, with CrowdFlower contributors now in every country of the world, the experiment becomes much richer.
About 8% of the male population has some sort of color vision deficiency. The color blind are unable to clearly distinguish different colors of the spectrum, they tend to see colors in a limited range of hues. Because of this, the color blind have trouble with a lot of websites. The patterns and examples on We Are Color Blind help developers create websites the color deficient can use with minimal problems. Take a color vision test to see where you stand. 50 facts about color blindness.
How do things look to colorblind people? Colour Lovers (Prev: 1, 2, 3, 4, 5 - all more useful to those who aren't colorblind) offers some popular websites and iconic art, As Seen By The Color Blind. Luckily humans are smart and have created technology like the Color Blind Web Page Filter. Prev. Wiki.
Color Scheme Adjust Hue, Brightness, Saturation, Scheme and considerations for Visual Anomalies.