color calculator xiaoyan song [email protected] feb.21,2003
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Feb.21,2003 Xiaoyan Song 3
Motivation
Present a handy tool for color calculation A tool for color science short-course
education
Feb.21,2003 Xiaoyan Song 4
Project Overview
CIE Standard Demo • Illuminants A and D65
• Observer (1931 and 1964)
Color Matching Function Color Spaces Transformation Color Difference Calculation
Feb.21,2003 Xiaoyan Song 5
Background
CIE • Commission Internationale DE ’ECLARAGE• International Commission on Illumination
CIE Standard (Illuminants, Observer) Tristimulus Calculation Color Space Color Difference
Feb.21,2003 Xiaoyan Song 6
Standard Illuminant Light defined by a relative
spectral power distributionCI E Standard I l l umi nant:F
0
10
20
30
40
50
380 480 580 680 780Wavel ength(nm)
Rela
tive
Pow
er
F1F2F3F4
CI E Standard I l l umi nants
0
50
100
150
200
250
300
380 480 580 680 780
Wavel ength(nm)
Rela
tive
Pow
er
AD65
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Standard ObserverCI E Standard Observer
- 0. 5
0
0. 5
1
1. 5
2
2. 5
360 460 560 660 760
Wavel ength
Tri
stim
ulus
Val
ues
x2y2z2x10y10z10
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Color Space
It is used for color specification
XYZ
Chromaticity
1976 L*a*b*
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Color Difference
Delta E*abDelta E*ab
Delta E*94Delta E*94
Delta E*00Delta E*00
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Flowchart
Color CalculatorColor Calculator
DatabaseDatabase
Color CalculatorColor Calculator
User’s Input DataUser’s Input Data
Calculation ResultCalculation Result Graphic OutputGraphic Output
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Features I:
Flexible Options for CMF• Illuminant A OR Illuminant D65• 2 Degree OR 10 Degree Observer• Wavelength ranges and interval• Calculation Methods
• CIE traditional method
• ASTM 308
• Luminance Unit
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Feature II:
Introduce new improvements in Color Difference Calculation• CIELAB• CIE94• CIE2000 (new)
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Feature III: Visualization
Visualization• Standard Observer• Standard Illuminant • Reflectance
Flexible results output• Data .txt file• Various image file (jpg,bmp,png,gif,tiff,…)