[4] Any color that lacks strong chromatic content is said to be unsaturated, achromatic, or near neutral.
For example, the "Achromatic" use of a white background with black text is an example of a basic and commonly default color scheme in web design.
Black and white have long been known to combine well with almost any other colors; black decreases the apparent saturation or brightness of colors paired with it, and white shows off all hues to equal effect.
As a result, the energy is more subtle and peaceful due to a lack of contrast of hue.
[citation needed] An analogous color scheme creates a rich, semi-monochromatic look.
[citation needed] Red, reddish-orange, orange, yellow-orange is one example of a set of analogous colors.
Even when using pale or unsaturated versions of hues, it offers a higher degree of contrast while also retaining the color harmony.
This scheme is trendy among artists because it provides sharp visual contrast while maintaining balance, and color richness.
The most common practical color scheme is black-and-white, which generally maximizes contrast.
Enhancing contrast against a background motivates some practical color schemes, such as high visibility color schemes, while inhibiting contrast against a background motivates others, as in camouflage.
These color schemes can be categorized into different classes, depending on the nature of the underlying data.
[15][16] This palette quickly gained wide acceptance due to its reliable usability by non-experts, and has become a standard built into GIS and mapping software and other visualization tools.
[17][18][19] Other pre-made scientific color schemes that are distributed directly to users, but also frequently built into common visualisation toolboxes include:[10] Bivariate or trivariate schemes use two or three orthogonal sequential schemes to represent separate (but usually related) variables, with the various blended colors representing different combinations of values.
In some countries, a red, white and blue color scheme connotes the Flag of the United States.
Even the ubiquitous Traffic light color scheme (red, yellow, green) that was originally a qualitative color scheme, has transformed into a connotative color scheme as "red means stop" and "green means go" have solidified in culture, and through their meaning have been adopted in non-transportation related encoding like the Traffic Light Protocol or stop light parties.
In hotel room designs, the relationship between preferences of color schemes and gender was detected.