ArcObjects Component Help  (Core)

AlgorithmicColorRamp CoClass

An AlgorithmicColorRamp object determines the colors that occur between a FromColor and a ToColor. These colors can be assigned to various objects like a MultiPartColorRamp , or to a ClassBreaks renderer. When used by a ClassBreaks renderer, the intervening colors represent equal steps between the start and end color.

There are several ways to ramp colors, the default method is an HSV (Hue, Saturation, Value) algorithm, where the values of H, S, and V are all interpolated. Another method is a CieLab's algorithm which creates the intervening colors by intelligently blending the From and To colors. A third method is the LCH method, which is a variant of the CieLab's method and can create better results in some cases. In general the HSV produces brighter results, especially when the From and To colors are not of similar hues. However, the CieLab's and LCH methods may produce more intuitive results. This is because most casual map readers have more difficulty associating progression through a series of hues versus a smooth blend of colors.