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 has come to mean a palette of active colors. RAL K5 Fächer RGB.jpg|RAL CLASSIC K5 color fan Guidapantonestandard.JPG|[[Pantone]] color guideguide Nuancier Pantone.jpg|cards of [[Pantone]] base colors and blends HKS-K-Farbfaecher.jpg|[[HKS (colour system)|HKS]] colour fan Color gradient is a set of colors arranged in a linear order ( ordered) A continuous colormap is a curve through a colorspace 3D RGB profile of the Linear Gray Continous color gradient.png|gray 3D RGB profile of cubehelix color gradient.png|cubehelix[http://www.mrao.cam.ac.uk/~dag/CUBEHELIX/ Dave Green's `cubehelix' colour scheme] 0 3d 60 75 v.png|HSV rainbow 3D RGB profile of the Smooth Cool Warm diverging color gradient by Kenneth Moreland.png|diverging[http://www.kennethmoreland.com/color-maps/ Diverging Color Maps for Scientific Visualization - Kenneth Moreland] A colormap is a function which associate a real value r with point c in color space which is defined by: a colorspace C an increasing sequence of sampling points a series of values in the colorspace the mapping a rule for interpolating the intermediate values where: r is a real number is a set of real numbers c is a color = point in colorspace C Criteria for classification: dimension discrete / continuous shape range: full or limited. Example : pastel color with limited range of saturation. perceptual uniformity order ordered (sequential) and non-ordered (categorical) perceptual order readability for color-vision deficient or color-blind people ( colorblind-friendly) color space color depth 1D 2D 3D An axial color gradient (sometimes also called a linear color gradient) is specified by two points, and a color at each point.