色差分析及管制办法(精品).ppt

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1、奇奇 菱菱 科科 技技 股股 份份 有有 限限 公公 司司The Light is a range of colors CosmicCosmicraysraysX raysX raysUVUVIRIRRadio wavesRadio waves1st.dimension of color=the hue2nd.dimension of color=the lightness3rd.dimension of color=the saturationColor is tridimensional3.Saturation3.Saturation2.Lightness2.Lightness1.Hue1

2、.HueCIE-L*a*b*SYSTEM reduced to 2 dimensionsCIE-L*a*b*SYSTEM reduced to 2 dimensionsSpectral energy distribution of standard illuminantsSpectral energy distribution of standard illuminantsENERGYENERGYA AD65D65 400400700700Light source and the influence on the color Light source and the influence on

3、the color L*=43.2L*=43.2C*=54.5C*=54.5h?=32.5h?=32.5L*=43.5L*=43.5C*=53.2C*=53.2h?=28.5h?=28.5x=A AE ER%R%ExRExR%=xD65D65R%R%E EExRExR%Energy distributionEnergy distributionReflectance curve of theReflectance curve of thepatternpatternEnergy multipliedEnergy multipliedby the reflectanceby the reflec

4、tanceLight source and the influence on the color Light source and the influence on the color The human eye3 types of spectral sensitive cells who react on RGB3 types of spectral sensitive cells who react on RGBRGBRGBColour matching functionsXXYZ400400700700500500600600Spectral sensitivity of the hum

5、an eyeSpectral sensitivity of the human eyeLight reflectionA part of light is absorbed A part of light is absorbed and transformed into heatand transformed into heatAbsorbing partAbsorbing partReflectance curveReflecting partReflecting part400400500500600600700700%IlluminationEyeobject3 elements are

6、 necessary to see a color:3 elements are necessary to see a color:the light,the object and the eyethe light,the object and the eyeBrainHuman eye3 types of cones on the retina3 types of cones on the retinaEyeXYZTristimulus methodNumericalvaluesMicro processorReceptor section3 filters who correspond3

7、filters who correspond to the human eye to the human eyeThese instruments are only suitable for quality controlThese instruments are only suitable for quality control with limited features mainly with limited features mainly colourcolour differences differences Spectrophotometric methodCurveNumerica

8、lvaluesMicro processorReceptor sectionReceptor section:multiple sensorsReceptor section:multiple sensorssensitive to a particular wavelengthsensitive to a particular wavelengthHigh precision indispensable for High precision indispensable for absolutabsolut color data color data for the recipe calcul

9、ation and for the recipe calculation and metamerismmetamerism problems problemsXYZX Y Z X XX X=IlluminantIlluminantSpectral reflectanceSpectral reflectanceof the patternof the patternTristimulusTristimulus values valuesColor matchingColor matchingfunctionsfunctionsTristimulus valuesX=X=E E x R x R x

10、 X x X Y=Y=E E x R x R x Y x Y Z=Z=E E x R x R x Z x Z X XY YZ ZR RE EThese values can be mathematically These values can be mathematically transformed into L*a*b*valuestransformed into L*a*b*valuesStandardStandardProductionProductionL*L*+a*-a*-b*+b*Color space-L*The Delta L*in the color space is th

11、e difference between the The Delta L*in the color space is the difference between the production and the standard on the vertical Lightness axisproduction and the standard on the vertical Lightness axisStandardStandardProductionProductiona*a*+a*-a*-b*+b*The Delta a*in the color space is the differen

12、ce between the The Delta a*in the color space is the difference between the production and the standard on the horizontal Red(production and the standard on the horizontal Red(+a*+a*)Green()Green(-a*-a*)Axis)AxisColor space-a*StandardStandardProductionProductionb*b*+a*-a*-b*+b*Color space-b*The Delt

13、a b*in the color space is the difference between theThe Delta b*in the color space is the difference between theproduction and the standard on the horizontal yellow(+b*)blue(production and the standard on the horizontal yellow(+b*)blue(-b*-b*)Axis)AxisStandardStandardProductionProductionE*E*ababThe

14、Delta E in the color space corresponds to the total color differenceThe Delta E in the color space corresponds to the total color differenceusing the using the pythagoraspythagoras mathematical law for calculation.The Delta E does mathematical law for calculation.The Delta E doesnot show the directi

15、on of the color difference.For this reason it is notnot show the direction of the color difference.For this reason it is notsufficient for an objective interpretation.Therefore,the sufficient for an objective interpretation.Therefore,the splittedsplitted values values DL*,DL*,DaDa*,Db*,DC*,DH*are ne

16、cessary to make a precise interpretation.*,Db*,DC*,DH*are necessary to make a precise interpretation.+a*-a*-b*+b*Color space-E*E*E*abab b*b*+a a*a*+bColor space L*a*b*StandardStandardProductionProductionThe metamerismMetamericMetameric pair pairunder Daylightunder DaylightL*=68.5L*=68.5a*=8.7a*=8.7b

17、*=29.7b*=29.7L*=68.5L*=68.5a*=8.6a*=8.6b*=29.2b*=29.2 E=0.5E=0.5MetamericMetameric pair pairunder different illuminationunder different illuminationL*=71.2L*=71.2a*=12.8a*=12.8b*=32.8b*=32.8L*=71.1L*=71.1a*=18.7a*=18.7b*=31.8b*=31.8 E=6.0E=6.0Principle of metamerismXX=XX=XXXX=L*=68.5L*=68.5a*=8.6a*=

18、8.6b*=29.2b*=29.2L*=71.2L*=71.2a*=12.8a*=12.8b*=32.8b*=32.8L*=71.1L*=71.1a*=18.7a*=18.7b*=31.8b*=31.8L*=68.5L*=68.5a*=8.7a*=8.7b*=29.7b*=29.7DE=0.5DE=6.0Calculation examples in the CIE-L*a*b*SystemL*=71.2L*=71.2a*=12.8a*=12.8b*=32.8b*=32.8L*=71.1L*=71.1a*=18.7a*=18.7b*=31.8b*=31.8SampleSampleStandar

19、dStandard71.1-71.2=-0.171.1-71.2=-0.118.7-12.8=5.918.7-12.8=5.931.8-32.8=-1.031.8-32.8=-1.012.8 12.8 2 2 +32.8+32.8 2 2 =35.2 =35.2StandardStandardSampleSample-0.1-0.1 2 2 +5.9+5.9 2 2+-1.0 +-1.0 2 2=5.9=5.918.7 18.7 2 2 +31.8+31.8 2 2 =36.9 =36.936.9-35.2=1.736.9-35.2=1.75.9 5.9 2 2 -(-0.1)-(-0.1)2 2-(-1.7)-(-1.7)2 2=5.7=5.7Calculation examples in the CIE-L*a*b*SystemCalculation examples in the CIE-L*a*b*System塑膠製品顏色管制實務介紹塑膠製品顏色管制實務介紹色板表面狀況不同差異比較色板表面狀況不同差異比較