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A color wheel is a tool that provides a visual representation of the relationships between all possible hues. The primary colors are arranged around a circle at equal (120 degree) intervals. (Warning: Color wheels frequently depict "Painter's Colors" primary colors, which leads to a different set of hues than additive colors.)
This is a list of software palettes used by computers. Systems that use a 4-bit or 8-bit pixel depth can display up to 16 or 256 colors simultaneously. Many personal computers in the early 1990s displayed at most 256 different colors, freely selected by software (either by the user or by a program) from their wider hardware's RGB color palette.
With four colors, it can be colored in 24 + 4 × 12 = 72 ways: using all four colors, there are 4! = 24 valid colorings (every assignment of four colors to any 4-vertex graph is a proper coloring); and for every choice of three of the four colors, there are 12 valid 3-colorings. So, for the graph in the example, a table of the number of valid ...
is consistently oriented: if vertices and ′ have the same color, and vertices and ′ have the same color, then (,) and (′, ′) cannot both be edges in the graph. Equivalently, an oriented graph coloring of a graph G is an oriented graph H (whose vertices represent colors and whose arcs represent valid orientations between colors) such ...
The above shows that in terms of the number of vertices, the upper bound () is the best possible in general. In fact, a rainbow coloring using colors can be constructed by coloring the edges of a spanning tree of in distinct colors. The remaining uncolored edges are colored arbitrarily, without introducing new colors.
If the template has a separate documentation page (usually called "Template:template name/doc"), add [[Category:Color templates]] to the <includeonly> section at the bottom of that page.
This color scheme is the most varied color scheme because it uses six colors which are arranged into three complementary color pairs, or it could be seen as two color schemes that are complimentary to each other—such as two triadic color schemes or two near-analogous color schemes—or adding a complementary pair to a rectangular tetradic ...
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