ABSTRACT
Color is part of daily routine, from waking life and imagination to dreams. This chapter considers the basics of color and their general meanings, which may vary according by country and culture. Digital interfaces use the RGB color system, which stands for red, green, and blue. Zooming into any screen, one can see how RGB pixels are arranged to create colors. Considered psychologically, color is a nonvocal, purely visual means of communication. The use of color creates different dimensions of depth within the hierarchy and identity of the user interface (UI). The user not only accesses information but also receives subconscious and psychological messages from the colors in the UI that are related specifically to the user. The more colors added into the mix, the more complex and more difficult it becomes to arrange them. Sometimes, it is extremely necessary to add color because of the importance of information.
