Color Blindness Simulator
See an approximate rendering of an image as it might be perceived by a person with protanopia, deuteranopia, or tritanopia — the three main types of color blindness.
How it works
Each type of color blindness corresponds to a transformation matrix that recombines the red, green, and blue channels of every pixel according to coefficients established by colorimetric research (a common approximation used by many accessibility tools). The original image is transformed to give an approximate idea of how it would look for each of the three types of color blindness.
Are these simulations medically accurate?
No, they are mathematical approximations widely used for reference, but they cannot replace a real diagnosis or a lab-calibrated simulation. Real perception also varies from person to person, depending on the severity of their color blindness.
What is the difference between the three simulated types?
Protanopia and deuteranopia affect the red-sensitive and green-sensitive cones respectively, making it hard to distinguish red, green, and brown: these are the most common forms of color blindness. Tritanopia, which is rarer, affects the blue-sensitive cones and mainly makes it harder to tell blue from yellow.
100% local processing: color transformations happen entirely in your browser — your image is never sent to a server.