Color Calculator Xiaoyan Song [email protected] Feb.21,2003.

Color Calculator

Xiaoyan Song

[email protected]

Feb.21,2003

Feb.21,2003 Xiaoyan Song 2

Outline

Motivation Project Overview Background Flowchart, GUI, Features

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Motivation

Present a handy tool for color calculation A tool for color science short-course

education

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Project Overview

CIE Standard Demo • Illuminants A and D65

• Observer (1931 and 1964)

Color Matching Function Color Spaces Transformation Color Difference Calculation

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Background

CIE • Commission Internationale DE ’ECLARAGE• International Commission on Illumination

CIE Standard (Illuminants, Observer) Tristimulus Calculation Color Space Color Difference

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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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Calculating Tristimulus

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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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GUI

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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,…)

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Future Work

Computer platforms compatibility

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Thanks !