Profile
In 1931，the CIE(Commission Internationale De L'E'clalrage)setup a series of visible spectrum color space standards．The Basic CIE color space standardS iS CIE_XYZ．lt iS built on standard visual observerson the basis of ability to see，and it reflects the standardS scope of color by eye．Based On CIE_XYZ there are CIE_XvY，CIE_Lab，CIE Lch standard color space，etc.
At present，the CIE Lab color space iS the most commonly used in the industry．In ClE Lab color space，L value stands for color brightness and a value stands for the Green-0n-red value．and b value stands for the blue—on—yellow color value．If determine a value of color by only a group Lab，it will be not practical．However,we can determine the differences among them by comparing two groups of Lab values．
◆Technical Features：
⊙Easy operation make you use it easily
⊙Widely applied to quality control of plastic and printing industries’
⊙Display directly color difference by △E*ab、△L*a*b、CIE_L*a*b、CIE_L*C*h
⊙Standard deviation within△E*ab0.2(test condition：choose average values by 12pcs white tabula)
⊙It can be connected with computer to do the inspection by software with USB expansion interface．
◆Skills Indications
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test accuracy |
Within 0.2 △E*a b |
|
Display |
△E*ab、CIE_Lab、△L,△a,△b、CIE_Lch |
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Test swpe |
L:0—100 a：-128--127 b：-128--127 |
|
Test time |
About 3 seconds |
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Test Interval |
2 seconds |
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Test aperture |
￠8mm |
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Automatic shutdown |
Automatic shutdown after 5 minutes waiting |
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Light source |
C light source |
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Sensor |
Correct sillicon photodiode carrays |
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Power |
DC／5V(1.5A).2pcs 1.5V(AAA)batteries |
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Size |
171*50*48.8mm |
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Weight |
203.6g(Exclusive battery) |
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Ope rated temperature scope |
0-40 ℃132-104'f);lower than 85% relative humidlty |
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Standard accessories |
1 pc nlanual/softwbag/9V battery/5v external power supply／USB connecting cable／CD |
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Application |
Measure any color Of smooth surface |
◆CIE color space coordinate chart ◆Connecting with computer to do the analysis
COLOR DIFFERENCE FORMULA
△E*ab=[(△L*)2+(△a*)2。+(△b*)2]1/2
△L*=Lsample一L*standard(lightness difference)
△a*=a*Lsample一a* standard(red／green diference)
△b*=b*Lsample—b standard。mmd(yellow／blue difference)
◆Workin~theory
Compa re the color difference between sample and the measured subject then
output CIE_Lab 3 groups data，and the 4 groups of △E，△L，△a，△b data after
comparision
△E stands for the totaI color difference.
△L+stands for partial white，△L-stands for partial black(cornpa ring with p rototype)
△a+stands for pa rtial red，△a—stands for partial green(comparing with p rototype)
△b+stands for pa rtial yellow，△b-stands for pa rtial blue(comparing with plrototype)
|
Color dif SCOpe |
Color dif．anylysis |
|
0.0 25AE |
very small or no；very perfect matching |
|
0.25—0.5△E |
small；acceptable matching |
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0.0—1.0△E |
small to medium：acce-ptabIe in some areas |
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1.0—2.0△E |
Medium：acceptable in some a reas |
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2.0—4.0△E |
has dislance：acceptable in special applications |
|
4.0 △E |
ve ry big；not acceptable in most applications |
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