Different color spaces, namely, gray scale [2, 3], RGB [4, 5], normalized RGB , Ruta's RGB , YCbCr [8, 9], HSI , HSV [11, 12], HSL , and CIE Lab
, have been used.
The initial color of the polymerized specimens were recorded with a by using CIE Lab
color parameters from 3 points for each sample on a white background (VITA Easyshade Compact Advance 4.0, VITA Zahnfabrik H.
Munsell, CIE Yxy, CIE Lab
, CIE LCH; [CIE: Commission Internationale de L'Eclairages, or International Commission on Illumination]; Schanda, 1997).
The CIE [L.sup.*] from the CIE Lab
color space is widely used for tongue diagnosis because the CIE [L.sup.*] value is appropriate for representing the amount of tongue coating or tongue coating thickness.
Therefore, it was found a relation inversely proportional for the parameters of the CIE Lab
space color and the time of the fruit from the exposition with the pesticide.
performed a comparison between using different color spaces in color transfer techniques (see Figure 6) and came to the conclusion that color spaces L[alpha][beta] and CIE LAB
(with illuminants E) perform the best.
The new metric employs the CIE Lab
color space, which is often used in attempts to describe perceptual color differences.