In this paper, a novel scheme for multispectral edge operator is presented. The dichromatic model proposed by Shafer [1] is used to describe the object reflection properties in HSV spectral space. Under the properties and white illustration assumption, the specular reflection from the color image that mainly cause false edge result can be removed. The scheme is designed to detect the color boundary and the shading edge on a uniform color object as well as downward compatible to grey intensity image