The LCH color model is defined by the CIE colorimetry standard as perceptually uniform color space, based on the polar coordinate system. L is a measure of lightness of an object, C is a measure of chroma (saturation) which represents the distance from the neutral axis, and H is an angular measure of hue. The uniformity of the LCH space allows color differences to be equally weighted throughout its domain. During the merge operation ImageWarp treats each pixel in three input images as L, C and H values of the correspondent pixel of the output image and converts them into the RGB triplets using the color coordinate relationship. The opposite process is performed during the split operation. The processing algorithms are applied to the L component only, leaving the other two components intact.