A method of matching image color and or luminance characteristics in an image processing system. In order to match an input image with a reference image, a color transformation M is initialised (601). An output image is copied (602) from the input image. The following sequence of operations is then repeated:...http://www.google.com.hk/patents/US7003178?utm_source=gb-gplus-share專利 US7003178 - Color matching image data
