Chapter 5: Color Analysis 5.1 CIE L*a*b* system : most popular system... Chapter 5: Color Analysis 5.2 Manipulation of data CIE là từ viết tắc của Commission Internationale de l’ Éclaira
Trang 1Chapter 5: Color Analysis
5.1 CIE L*a*b* system : most popular system
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5.2 Manipulation of data
CIE là từ viết tắc của Commission Internationale de l’
Éclairage Ủy ban đo lường và chiếu sáng quốc tế (1986)
L = lightness or darkness
+a = redness
-a = greenness
+b = yellowness
-b = blueness
Chroma = (a2 + b2)1/2
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5.2 Manipulation of data
Theta (ϴ ): is the angle that a line joining the point in Hunter space with the origin makes with the horizontal axis
ϴ = tan (a/b)
ϴ = 0 : red
ϴ = 90o : yellow
ϴ = 180o : green
Using ϴ and L for analysis of the variance
Δ = indicate how much sample and standard differ from one another
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5.2 Manipulation of data
Theta (ϴ ): is the angle that a line joining the point in Hunter space with the origin makes with the horizontal axis
ϴ = tan (a/b)
Redness (+a)
ϴ