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2. Color gradient - Wikipedia

   en.wikipedia.org/wiki/Color_gradient

   In color science, a color gradient (also known as a color ramp or a color progression) specifies a range of position-dependent colors, usually used to fill a region. In assigning colors to a set of values, a gradient is a continuous colormap, a type of color scheme . In computer graphics, the term swatch [ 1] has come to mean a palette of ...

3. Winogradsky column - Wikipedia

   en.wikipedia.org/wiki/Winogradsky_column

   Also, in column three, the red growth along the side of the column: a purple sulfur bacterium, Chromatium. The Winogradsky column is a simple device for culturing a large diversity of microorganisms. Invented in the 1880s by Sergei Winogradsky, the device is a column of pond mud and water mixed with a carbon source such as newspaper (containing ...

4. Image gradient - Wikipedia

   en.wikipedia.org/wiki/Image_gradient

   An image gradient is a directional change in the intensity or color in an image. The gradient of the image is one of the fundamental building blocks in image processing. For example, the Canny edge detector uses image gradient for edge detection. In graphics software for digital image editing, the term gradient or color gradient is also used ...

5. Help:Using colours - Wikipedia

   en.wikipedia.org/wiki/Help:Using_colours

   The method used for selecting the colours for various top-level pages, e.g. Main Page, Community Portal, Contents, and Help:Contents. The 3 colours are generated using the HSV colour space, then translated into RGB. Hue. Saturation 4% Brightness 100% main background. Saturation 10% Brightness 100% 2nd header, accent colour.

6. List of flags containing the color purple - Wikipedia

   en.wikipedia.org/wiki/List_of_flags_containing...

   Purple is one of the least used colors in vexillology and heraldry. Currently, the color appears in only four national flags: that of Dominica, Spain, El Salvador, and Nicaragua, and one co-official national flag, the Wiphala (co-official national flag of Bolivia ). However, it is also present in the flags of several administrative subdivisions ...

7. Color wheel - Wikipedia

   en.wikipedia.org/wiki/Color_wheel

   Color wheel. Gradient RGB / CMY color wheel. Seven-color and twelve-color color circles from 1708, attributed to Claude Boutet. Wilhelm von Bezold's 1874 Farbentafel. A color wheel or color circle[ 1] is an abstract illustrative organization of color hues around a circle, which shows the relationships between primary colors, secondary colors ...

8. List of flags by color combination - Wikipedia

   en.wikipedia.org/wiki/List_of_flags_by_color...

   Bhutan (with distinct yellow and orange) Hanover (1837–1866) Hindu flag (with distinct orange) Jacksonville, Florida, United States (with a distinct gold and orange and a brown emblem) Jerusalem cross – flag used by several Crusader states. Kędzierzyn-Koźle, Poland (with multicolored coat of arms)

9. Non-binary flag - Wikipedia

   en.wikipedia.org/wiki/Non-binary_flag

   The non-binary flag consists of four equally-sized horizontal bars: yellow, white, purple, and black. There is no official or agreed-upon proportion (the images in this article are 2:3). The yellow stripe represents people outside the cisgender binary. The white stripe represents people with multiple genders. The purple stripe represents people ...