A color processing system includes a storage memory stored with several pieces of reference data corresponding to display colors and printing colors respectively, a cache, and a CMM (color management module) for converting display colors of an image data into color regions having the printing colors. The CMM includes a data capture module and a color match module. The data capture module is electrically coupled to the storage memory and the cache. The color match module is electrically coupled to the data capture module. The color match module can capture display colors of an image data from an exterior thereof and a piece of reference data corresponding to the display colors from the cache via the data capture module. The captured display colors of the image data are converted by the color match module into color regions having the printing colors.