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The 2019 Suburban will have both Havana Metallic and Tungsten Metallic deleted in favor of a new Shadow Gray Metallic exterior color, while the top-of-the-line Premier now had the name displayed on the tailgate. The LS trim continued to make HD Radio a standard feature, but could be deleted if customers opted for the OnStar feature.
A gray card is a flat object of a neutral-gray color that derives from a flat reflectance spectrum. A typical example is the Kodak R-27 set, which contains one 8 in × 10 in (20 cm × 25 cm) card and one 4 in × 5 in (10 cm × 13 cm) card, each with an 18% reflectance across the visible spectrum , and a white reverse side with a 90% reflectance.
Light meters, cameras, and pictures are often calibrated using an 18% gray card [4] [5] [6] or a color reference card such as a ColorChecker. [ 7 ] [ 8 ] [ 9 ] On the assumption that 18% is similar to the average reflectance of a scene, a gray card can be used to estimate the required exposure of the film.
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In photography and optics, a neutral-density filter, or ND filter, is a filter that reduces or modifies the intensity of all wavelengths, or colors, of light equally, giving no changes in hue of color rendition. It can be a colorless (clear) or grey filter, and is denoted by Wratten number 96. The purpose of a standard photographic neutral ...
For power circuits, the color-coding uses the same colors as residential construction, and adds the additional wires used for three-phase systems. Black, Red and Blue are used for hot wires and White is used as the neutral wire in a 120/208 V circuit. Brown, Orange and Yellow are used as hot wires and gray is used as the neutral wire in a 277/ ...