An Evaluation of Significant Lightness Difference Effective Term for CIEDE2000 Comparative Image Colour Pixels

Abstract

As CIEDE2000 standard has developed the colour difference formula, the colour difference formula of compared colours in similar colour space has been evaluated and emphasized in this paper. The lightness difference effective term has been distinctively separated from the small informative colourdifference of CIEDE2000. In addition, the power of the lightness difference effective term can clearly magnify the lightness difference which illustrated categorized surfaces of the lightness difference effective term for total colour differences in the CIEDE2000 standard. All projected four categories are classified by compared image colour pixels based on the colour space’s three forward transform functions of the lightness of the colour, the chroma between red/magenta and green, and the chroma between yellow and blue. Results show that the lightness difference effective term gives mainly three different surfaces in four categories. Furthermore, in first category, the most two maximum statistical frequencies can be expressed with the left side along with the right side of the probability mass function of the lightness difference effective term; in third category, the obvious maximum statistical frequency can be expressed with only the left side of the probability mass function; and in second and fourth categories, the maximum statistical frequency can be expressed most absolutely with the left side of the probability mass function.