Performance of a color-difference formula based on OSA-UCS space using small-medium color differences.
An investigation of the color metrics and the complexity of the CIEDE2000 formula shows that CIELAB space is inadequate to represent small-medium color differences. The OSA-UCS (Uniform Color Space) Committee has shown that no space with uniform scale for large color differences exists. Therefore the practical way for color-difference specification is a color-difference formula in a nonuniform space. First, the BFD (Bradford University) ellipses are considered in the OSA-UCS space, and their very high regularity suggests a new and very simple color-difference formula at constant luminance. Then the COM (combined) data set used for the development of the CIEDE2000 formula is considered in the OSA-UCS space, and the color-difference formula is extended to sample pairs with a different luminance factor. The value of the performance factor PF/3 for the proposed OSA-UCS-based formula shows that the formula performs like the more complex CIEDE2000 formula for small-medium color differences.
Huertas
Rafael
R
Departamento de Optica, Facultad de Ciencias, Universidad de Granada, 18071, Granada, Spain.
Melgosa
Manuel
M
Oleari
Claudio
C
D000465:Algorithms; D003116:Color / Q000592:standards*; D003124:Colorimetry / Q000379:methods* / Q000592:standards*; D004056:Differential Threshold; D005060:Europe; D017408:Guidelines as Topic; D012015:Reference Standards; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity