Color blindness simulator

Color blindness is reduced ability to distinguish between certain colors or wavelengths of light. It is, most commonly, a lack of distinction between the colors red and green. It is not generally a lack of seeing all colors (this is extremely rare). It is usually inherited.

"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. (via)

This online tool simulates two types of color blindness:

• Protanopia (referred to as "red-weakness"): lacking the long-wavelength sensitive retinal cones. Those with this condition are unable to distinguish between colors in the green-yellow-red section of the spectrum.
• Deuteranopia (referred to as "green-weakness"): lacking the medium-wavelength cones. Those affected are again unable to distinguish between colors in the green-yellow-red section of the spectrum as well.

Browse to an image on your hard drive and click Submit:

Please do not attemp to upload files bigger than 500K in size. They will be rejected. Also, limit image types to gif, jpeg and png.

Type of simulation:

Protanopia: inability to see the color red or to distinguish red and bluish-green
Deuteranopia: inability to see the color green or to distinguish green and purplish-red