Color rendering

Once the job is completed, the UniChem GUI can be used to visualize results. It can be used to visualize common three-dimensional properties, such as electron density, orbital densities, electrostatic potentials, and spin density. It supports both the visualization of three-dimensional surfaces and colorized or contoured two-dimensional planes. There is a lot of control over colors, rendering quality, and the like. The final image can be printed or saved in several file formats. 

Typical values of correlated color temperature (CCT) and color rendering index (CRl) for some common electric light sources. 

These lamps show moderately good color rendering properties, the very broad spectrum being one of their main utilities. For instance, high-pressure Xe lamps or deuterium lamps are commonly used in optical spectroscopy techniques. 

Figure 2. The color-rendering index (CRI), of similarity to daylight-rendering, dependence upon choice of triad of spectral lights to form white light of daylight-color. Wavelengths of two components are fixed at their peaks, and the wavelength of the third component is varied. Optimum combination appears in Figure 3.

The ability of a light source to correctly represent colors of objects is its color rendering index (CRI), and with the CCT it suffices to help colorists select an equivalent source. Established by the CIE this standard rates lamps as to their color matching ability. A CRI value of 100 indicates that a source truly represents all colors of the CIE standard. Sources with CRIs of 70 to 80 are considered good and those with values of 80+ are rated as excellent. 

Table 3 Some Sources That Have Been Used for Pharmaceutical Photostability Testing and Their Respective Color Rendering Indexes and Correlated Color Temperatures...

Abbreviations, f, fluorescent CRI, color rendering index CCT, correlated color temperature. 

Fluorescent lamps are rated in catalogs by two indices, their correlated color temperature (CCT) and color-rendering index (CRI). The CCT is the temperature of a black body whose chromaticity most nearly matches that of the subject light source. Because a fluorescent lamp only approximates a "black body," it is called correlated to distinguish it from actual. The CRI on the other hand is a subjective method developed by the CIE in which eight test colors are viewed under the test and a reference lamp(s) and its ability to reproduce the test colors numerically rated. Both numbers are not absolute but useful in selecting lamps for color rendering applications. 

Metal-halide 94 6,000 Excellent color rendering Floodlighting plant irradiation... 

Gorlach, E. Richmond, R. Lewis, I. High-Throughput Flow Injection Analysis Mass Spectroscopy with Networked Delivery of Color-Rendered Results. 

The CIE (Commission International d Eclarirage) coordinates, color temperature (CT) and color rendering index (CRI) were quantitatively evaluated from EL spectra... 

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