Donaldson R F Color Blindness Simulator
See how an image or a colour palette looks to people with the most common types of colour vision deficiency.
Click to choose an image or drag and drop it here
100% means complete absence of that type of cone (dichromacy); lower values approximate milder forms (anomalous trichromacy).
Test a colour palette
About the simulation
About 1 in 12 men and 1 in 200 women have some form of colour vision deficiency. Protanopia (no red cones) and deuteranopia (no green cones) make reds, greens and browns hard to tell apart; tritanopia (no blue cones, rare) affects blues and yellows; achromatopsia is total colour blindness. The transformation follows the physiologically based model of Machado, Oliveira & Fernandes (2009, IEEE Transactions on Visualization and Computer Graphics) applied in linear RGB; severities below 100% are interpolated between normal vision and the full matrix. It is an approximation — real perception varies between people and screens — but it is a good way to spot designs that rely on colour alone. Add labels, patterns, icons or sufficient contrast so that information never depends on hue only.