Introduction:Accessibility:Color Blindness
From KDE-HIG_Wiki
A significant part of the male population (about 5%, depending on the country) perceive colors differently from the rest of the people. Most of them can still see all colors, but it is more difficult for them to distinguish between similar tones of red or green than for most people. It is very likely that between 50 and 100 KDE contributors are affected without knowing it.
People with normal vision and most color-blind people perceive colors in a 3-dimensional space, which can be presented as a bi-cone (trichromatic, left). White is on top, black at the bottom, gray in the middle, and all the rainbow colors at the edge.
Some color-blind people perceive colors in a 2-dimensional space (dichromatic, right), which can be represented like a vertical cut through the bi-cone on the left. All colors are perceived as identical with some shade of red, gray or blue. People with full red-green colorblindness, for example, cannot distinguish at all between red, green, yellow and orange, even if they know that the color of leaves is called green and that the color of wood is called brown.
The following table shows how colors are perceived by people who have one of the stronger forms of color blindness:
| Normal vision | Protanopia and Deuteranopia | Tritanopia | Monochromacy |
|---|---|---|---|
| magenta | gray or like some shade of blue | gray or like some shade of red | gray |
| pink | gray or like some shade of blue | gray or like some shade of red | gray |
| red | like some shade of red | like some shade of red | gray |
| brown | like some shade of red | like some shade of red | gray |
| orange | like some shade of red | like some shade of red | gray |
| yellow | like some shade of red | gray | gray |
| green | like some shade of red | like some shade of blue | gray |
| cyan | gray | like some shade of blue | gray |
| blue | like some shade of blue | like some shade of blue | gray |
