Color Cube

Figure 4.6 sRGB color cube drawn in XYZ 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. 

Figure 6.25 Results obtained with color cluster rotation where the cloud of points is shifted to the center of the color cube and all points are rescaled by the inverse of the square root of the largest eigenvalue.

Figure 8.3 Algorithm of Pomierski and GroB (1995). (a) A cloud of points inside the RGB color cube. The main axis is also shown, (b) The cloud of points is rotated onto the gray vector, (c) The point cloud is rescaled such that the color space is completely filled.

Figure 11.4 The gray vector passes from [0, 0, 0] to [1,1, 1] directly through the middle of the color cube. If local space average color is located away from the gray vector, we can use a shift perpendicular to the gray vector to move the color back to the center.

Color cluster rotation, color cloud is centered and then rescaled to fill color cube. 

Colour separation and recombination in projection displays is made with the Color Cube . The device is optimized in uniformity, reliability and repeatability for high resolution projection systems requiring dichroic prisms [91]. 

Balzers Thin Film Components Products Informations Color Wheel , BD 800 097 RE (9711)1/1, and Color Cube , BD 800 096 RE (9711)1/1. 

Oxids.—Lead Monoxid—Protoxid—Hassicot—Litharge —Plum-bi oxidum (XT. S. Br.)—PbO—222.9—is prepared by heating Pb, or its carbonate, or nitrate, in air. If the product have been fused, it is litharge if not, massicot. It forms copper-colored, mica-like plates, or a yellow powder or crystallizes, from its solution in soda or potash, in white, rhombic dodecahedra, or in rose-colored cubes. It fuses near a red heat, and volatilizes at a Avhite heat sp. gr. 9.277-9.5. It is sparingly soluble in HaO, forming an alkaline solution. 

The molecular structures were rendered with good-quality shading on a blue background. Isosurfaces produced from cube files or checkpoint files also looked nice. Molecular vibrations can be animated on screen and vibrational displacement vectors displayed. The vibrational line spectrum may be displayed too, but the user has no control over the axes. There is no way to set the background color. The display can be saved using several image file formats. 

Modified ethylene—tetrafluoroethylene copolymers are commercially available ia a variety of physical forms (Table 6) and can be fabricated by conventional thermoplastic techniques. Commercial ETFE resias are marketed ia melt-extmded cubes, that ate sold ia 20-kg bags or 150-kg dmms. In the United States, the 1992 price was 27.9—44.2/kg, depending on volume and grade color concentrates are also available. 

The perfluorovinyl ether comonomer used for PEA is expensive, as is PEA. Most PEA grades are sold as extmded, translucent cubes in various colors at 47.9—60.3/kg. Some PEA types are also marketed in nonextmded forms. 

Crystal Morphology. Size, shape, color, and impurities are dependent on the conditions of synthesis (14—17). Lower temperatures favor dark colored, less pure crystals higher temperatures promote paler, purer crystals. Low pressures (5 GPa) and temperatures favor the development of cube faces, whereas higher pressures and temperatures produce octahedral faces. Nucleation and growth rates increase rapidly as the process pressure is raised above the diamond—graphite equiUbrium pressure. 

Comtet s two-volume work on combinatorics [ComL70] appeared in 1970. It contained an account and proof of Polya s Theorem together with all the necessary preliminaries — definitions of cycle-index, Burnside s Lemma, and so on. Comtet illustrated Polya s Theorem by a single example, the coloring of the faces of a cube. 

FIGURE 5.28 A fragment ot the structure constructed as described in Fig. 5.27. This fragment shows the origin of the names "cubic close-packed" or "face-centered cubic" for this arrangement. The layers A, B, and C can be seen along the diagonals of the faces of the cube and are indicated by the different colors of the atoms. 

Vigreux column must extend sufficiently into the top of a well-ventilated hood to entrain effectively the fumes that will be generated later in the operation. The phenol is melted with the aid of an external oil bath or Glascol heating mantle and heated to about 100°. The heating bath is removed, and 27.6 g. (1.20 g. atoms) of sodium in cubes about 1 cm. on a side or smaller is added to the stirred mixture at such a rate that the temperature does not exceed 150-160°. The molten mass gradually becomes dark red in color as the sodium dissolves. While the addition and solution of the sodium is proceeding, a cold solution of about 0.25 mole of chloramine in 250 ml. of ether is prepared (Note 2). 

Riva, M., Corteflino, G., Maestrelli, A., and Torreggiani, D. 2001. Structure collapse and color changes in osmo-air-dehydrated peach cubes. Food Sci. Biotechnol. 10, 598-601. 

Enantioselectivity of affinity. If a receptor has sites for three of the substituents (symbolized in B by a cone, a sphere, and a cube) on the asymmetric carbon to attach to, only one of the enantiomers will have optimal fit. Its affinity will then be higher. Thus, dexeti-mide displays an affinity at the musca-Lullmann, Color Atlas of Pharmaoology... 

Figure 11.1 DFT-calculated reaction energies and structures for two models of the interaction between a siloxane-capped aluminosilsesquioxanemonosilanol cube (representing the silica-alumina surface) and CHsReOs. Color scheme Re (yellow), Al (purple), Si (blue), O (red), C (green), H (white). (Reprinted from Reference [39].)...

Dry ice can also be used with cabbage leaf pH indicator. Place several drops of cabbage leaf indicator into a plastic tub containing water. Drop in several cubes of dry ice. The color should change indicating a drop in pH as the carbonic acid, H COj, concentration increases in the water. 

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