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  2. Four color theorem - Wikipedia

    en.wikipedia.org/wiki/Four_color_theorem

    A four-colored map of the states of the United States (ignoring lakes and oceans) In mathematics, the four color theorem, or the four color map theorem, states that no more than four colors are required to color the regions of any map so that no two adjacent regions have the same color. Adjacent means that two regions share a common boundary of ...

  3. Chroma subsampling - Wikipedia

    en.wikipedia.org/wiki/Chroma_subsampling

    The mapping examples given are only theoretical and for illustration. Also the diagram does not indicate any chroma filtering, which should be applied to avoid aliasing. To calculate required bandwidth factor relative to 4:4:4 (or 4:4:4:4), one needs to sum all the factors and divide the result by 12 (or 16, if alpha is present).

  4. File:Four Colour Map Example.svg - Wikipedia

    en.wikipedia.org/wiki/File:Four_Colour_Map...

    File:Four Colour Map Example.svg. Size of this PNG preview of this SVG file: 300 × 400 pixels. Other resolutions: 180 × 240 pixels | 360 × 480 pixels | 576 × 768 pixels | 768 × 1,024 pixels | 1,536 × 2,048 pixels. Original file ‎ (SVG file, nominally 300 × 400 pixels, file size: 13 KB) Wikimedia Commons Commons is a freely licensed ...

  5. Chorochromatic map - Wikipedia

    en.wikipedia.org/wiki/Chorochromatic_map

    A Chorochromatic map (from Greek χώρα chóra 'region' and χρώμα chróma 'color'), also known as an area-class, qualitative area, or mosaic map, is a type of thematic map that portray regions of categorical or nominal data using variations in color symbols. Chorochromatic maps are typically used to represent discrete fields, also known ...

  6. Wikipedia:WikiProject Maps/Conventions - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:WikiProject_Maps/...

    An introduction explaining the style objectives and the most convenient way to create a such map. A color summary table with two (up-to-date) map examples. The naming convention for upload, and other advice like the scale or the legend. An up-to-date SVG template. Further details on history, limits, and possible expansions. A gallery of examples.

  7. Graph coloring - Wikipedia

    en.wikipedia.org/wiki/Graph_coloring

    A proper vertex coloring of the Petersen graph with 3 colors, the minimum number possible. In graph theory, graph coloring is a special case of graph labeling; it is an assignment of labels traditionally called "colors" to elements of a graph subject to certain constraints. In its simplest form, it is a way of coloring the vertices of a graph ...

  8. Color space - Wikipedia

    en.wikipedia.org/wiki/Color_space

    Adding a specific mapping function between a color model and a reference color space establishes within the reference color space a definite "footprint", known as a gamut, and for a given color model, this defines a color space. For example, Adobe RGB and sRGB are two different absolute color spaces, both based on the RGB color model.

  9. Image color transfer - Wikipedia

    en.wikipedia.org/wiki/Image_color_transfer

    Image color transfer. Image color transfer is a function that maps (transforms) the colors of one (source) image to the colors of another (target) image. A color mapping may be referred to as the algorithm that results in the mapping function or the algorithm that transforms the image colors. The image modification process is sometimes called ...