Homogeneous color space

L describes lightness and extends from 0 (black) to 100 (white). The a coordinate represents the redness-greenness of the sample. The b coordinate represents the yellowness-blueness. The coordinates a and b have a range of approximately [—100,100]. Notice the cube root in the above equation. The cube root was introduced in order to obtain a homogeneous, isotropic color solid (Glasser et al. 1958). Visual observations correspond closely to color differences calculated in this uniform coordinate system. A transformation of the sRGB color cube to the L a b color space is shown in Figure 5.5. 

Space Group and Pearson Symbol P6m2, hP2 Composition Narrow range of homogeneity, a-WCg gg WCj qo Molecular Weight 195.86 g/mol Color gray... 

Figure 7 shows the hue value frequency of an unencapsulated TLC layer in compariscai to a more common layer with micro-encapsulated TLCs (micro-encapsulation). While unencapsulated TLCs display a clear-cut signal for a homogenous temperature distribution, micro-encapstflated TLCs show a much more attenuated and blurred signal. This is due to the empty space between the capsules which displays no color information and due to the reflections on the capsule surface. 

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