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|−|Color is a basal quality in human perception. Color can be used for communication, it is a very efficient way to direct attention, and significance can assigned to an object with color. However, color is a historical and cultural phenomenon, and is subject of continuous aesthetical changes. Furthermore, it should be taken into consideration that a rather high percentage of population has a perception disorder ranging from difficulties to discriminate between red and green to complete color blindness. |+|
|−|* Choose colors by selecting the appropriate theme color or system color. You can use the [http:// kde-look.org/content/show.php/CheckColorRoles?content=90034 CheckColorRoles] theme to detect bugs regarding the use of system colors in your application. |+|
|−|* Never use color as a primary method of communication, but as a secondary method to reinforce meaning visually. |+|
|−|* Make foreground color contrasting to background. |+|
|−|* Consider accessibility for users with color vision deficiency (~5% population). |+|
|−|[http://api.kde.org/4.10-api/kdelibs-apidocs/kdeui/html/classKColorScheme.html KColorScheme] provides methods to pick readable colors based on the type of message to convey. |+|
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