An axial color gradient sometimes also called a linear is specified by two points and a color at each point. The colors along the line through those points are calculated using linear interpolation then extended perpendicular to that line. In digital imaging systems colors are typically interpolated in an RGB space often using gamma compressed RGB values as opposed to linear. CSS and SVG both support linear gradients.
A radial gradient is specified as a circle that has one color at the edge and another at the center. Colors are calculated by linear interpolation based on distance from the center. This can be used to approximate the diffuse reflection of light from a point source by a sphere. Both CSS and SVG support radial gradients.
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