计算机测色配色在印染行业中的应用 复杂分子合成化学 ---分析设计与战略实践_精品.ppt

7.2 Metamerism Illuminant metamerism Observer metamerism Field size metamerism Geometric metamerism * 7.3 Illuminant Metamerism Index Step 1 Samples in reference illuminant: Xr1 Yr1 Zr1 Xr2 Yr2 Zr2 Samples in test illuminant: Xt1 Yt1 Zt1 Xt2 Yt2 Zt2 * Step2- Calculation of New Sets of Tristimulus Plus X’t2= Xt2+(Xr1- Xr2) Y’t2 = Yt2+(Yr1- Yr2) Z’t2 = Zt2+(Zr1- Zr2) Multiply X’t2= Xt2 ?(Xr1/ Xr2) Y’t2 = Yt2 ?(Yr1 / Yr2) Z’t2 = Zt2 ?(Zr1 / Zr2) * Step3- Calculation of Colour Difference CIE1976L*a*b* CIELAB * ? * 7.4 CMCCON97 Step1- Data input Sample in test illuminant: X Y Z Adopted white in test illuminant: XW YW ZW Reference white in reference illuminant: XWT YWT ZWT Luminance of adapting field(cd/m2) LA * Step2- Calculation of RGB cone responses * Step3- Calculation of degree of adaptation(D) When CAT97 is calculated as a preliminary to CMCCON97, D=1 * Step4- Calculation of the corresponding RGB cone responses when B is negative, BC must be made negative * Step5- Calculation of the corresponding tristimulus values Step6- Using a suitably chosen colour-difference formula △E XC YC ZC XT YT ZT * Step1- Data input Sample in test illuminant: X Y Z Adopted white in test illuminant: XW YW ZW Reference white in reference illuminant: XWT YWT ZWT Luminance of adapting field(cd/m2) LA 7.4 CMCCON02 * Step2- Calculation of RGB cone responses * Step3- Calculation of degree of adaptation(D) F is 1.0, 0.9 and 0.8 for average. If D is greater than 1 or less than 0, set it to 1 o