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Slide Title,Body Text,Second Level,Third Level,Fourth Level,Fifth Level,奇 菱 科 技 股 份 有 限 公 司,The Light is a range of colors,Cosmicrays,X rays,UV,IR,Radio waves,1st.dimension of color=the hue,2nd.dimension of color,=the lightness,3rd.dimension of color=the saturation,Color is,tridimensional,3.Saturation,2.Lightness,1.Hue,CIE-L*a*b*SYSTEM reduced to 2 dimensions,Spectral energy distribution of standard illuminants,ENERGY,A,D65,400,700,Light source and the influence on the color,L*=43.2,C*=54.5,h?=32.5,L*=43.5,C*=53.2,h?=28.5,x,=,A,E,R%,ExR,%,=,x,D65,R%,E,ExR,%,Energy distribution,Reflectance curve of thepattern,Energy multipliedby the reflectance,Light source and the influence on the color,The human eye,3 types of spectral sensitive cells who react on RGB,RGB,Colour,matching functions,X,X,Y,Z,400,700,500,600,Spectral sensitivity of the human eye,Light reflection,A part of light is absorbed and transformed into heat,Absorbing part,Reflectance curve,Reflecting part,400,500,600,700,%,Illumination,Eye,object,3 elements are necessary to see a color:,the light,the object and the eye,Brain,Human eye,3 types of cones on the retina,Eye,X,Y,Z,Tristimulus,method,Numerical,values,Micro processor,Receptor section,3 filters who correspond to the human eye,These instruments are only suitable for quality control,with limited features mainly,colour,differences,Spectrophotometric,method,Curve,Numerical,values,Micro processor,Receptor section,Receptor section:multiple sensors,sensitive to a particular wavelength,High precision indispensable for,absolut,color data,for the recipe calculation and,metamerism,problems,X,Y,Z,X,Y,Z,X,X,=,Illuminant,Spectral reflectance,of the pattern,Tristimulus,values,Color matchingfunctions,Tristimulus,values,X=,E,x R,x X,Y=,E,x R,x Y,Z=,E,x R,x Z,X,Y,Z,R,E,These values can be mathematically,transformed into L*a*b*values,Standard,Production,L*,+a*,-a*,-b*,+b*,Color space-,L*,The Delta L*in the color space is the difference between the,production and the standard on the vertical Lightness axis,Standard,Production,a*,+a*,-a*,-b*,+b*,The Delta a*in the color space is the difference between the,production and the standard on the horizontal Red(,+a*,)Green(,-a*,)Axis,Color space-,a*,Standard,Production,b*,+a*,-a*,-b*,+b*,Color space-,b*,The Delta b*in the color space is the difference between the,production and the standard on the horizontal yellow(+b*)blue(,-b*,)Axis,Standard,Production,E*,ab,The Delta E in the color space corresponds to the total color difference,using the,pythagoras,mathematical law for calculation.The Delta E doesnot show the direction of the color difference.For this reason it is notsufficient for an objective interpretation.Therefore,the,splitted,values,DL*,Da,*,Db*,DC*,DH*are necessary to make a precise interpretation.,+a*,-a*,-b*,+b*,Color space-,E*,E*,ab,b*,+a,a*,+b,Color space L*a*b*,Standard,Production,The,metamerism,Metameric,pair,under Daylight,L*=68.5,a*=8.7,b*=29.7,L*=68.5,a*=8.6,b*=29.2,E=0.5,Metameric,pair,under different illumination,L*=71.2,a*=12.8,b*=32.8,L*=71.1,a*=18.7,b*=31.8,E=6.0,Principle of,metamerism,X,X,=,X,X,=,=,X,X,X,X,=,L*=68.5,a*=8.6,b*=29.2,L*=71.2,a*=12.8,b*=32.8,L*=71.1,a*=18.7,b*=31.8,L*=68.5,a*=8.7,b*=29.7,DE=0.5,DE=6.0,Calculation examples in,the CIE-L*a*b*System,L*=71.2,a*=12.8,b*=32.8,L*=71.1,a*=18.7,b*=31.8,Sample,Standard,71.1-71.2=-0.1,18.7-12.8=5.9,31.8-32.8=-1.0,12.8,2,+32.8,2,=35.2,Standard,Sample,-0.1,2,+5.9,2,+-1.0,2,=5.9,18.7,2,+31.8,2,=36.9,36.9-35.2=1.7,5.9,2,-(-0.1),2,-(-1.7),2,=5.7,Calculation examples in the CIE-L*a*b*System,塑膠製品顏色管制實務介紹,色板表面狀況不同差異比較,
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