Primary Colors
Posted on Monday, July 12th, 2010 at 4:33 am
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 Primary Colors A Novel of Politics by Anonymous Joe Klein 0446604275  US $5.47
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 Primary Colors DVD 1998 Anamorphic Widescreen US $4.99
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 FABRIC PANEL CUTE CAT NIPS WALL HANGING CRAFTS BRIGHT PRIMARY COLORS VTNS US $2.30
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 4 PYREX PRIMARY COLORS BOWLS YELLOW GREEN RED BLUE US $75.00
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 VINTAGE SET OF 4 MARIMEKKO VINYL PLACEMATS FLOWERS PRIMARY COLORS US $19.99
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 New never opened Making Memories Slice Primary Color Drawing Tips US $.99
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Apparent Color Of Objects And Symbolic Uses Of Color
Since the colors that compose sunlight or white light have different wavelengths, the speed at which they travel through a medium such as glass differs. Red light, having the longest wavelength, travels more rapidly through glass than blue light, which has a shorter wavelength. Therefore, when white light passes through a glass prism, it is separated into a band of colors called a spectrum. The colors of the visible spectrum, called the elementary colors, are red, orange, yellow, green, blue, indigo, and violet (in that order).
In fact color is a property of light and depends on its wavelength. When light falls on an object, some of it is absorbed and some is reflected. The apparent color of an opaque object depends on the wavelength of the light that it reflects; e.g., a red object observed in daylight appears red because it reflects only the waves producing red light. The color of a transparent object is determined by the wavelength of the light transmitted by it. An opaque object that reflects all wavelengths appears white; one that absorbs all wavelengths appears black. Black and white are not generally considered true colors as black is said to result from the absence of color, and white from the presence of all colors mixed together.
Colors whose beams of light in various combinations can produce any of the color sensations are called primary, or spectral, colors. The process of combining these colors is said to be "additive"; i.e., the sensations produced by different wavelengths of light are added together. The additive primaries are red, green, and blue-violet. White can be produced by combining all three primary colors. Any two colors whose light together produces white are called complementary colors, e.g., yellow and blue-violet, or red and blue-green.
When pigments are mixed, the resulting sensations differ from those of the transmitted primary colors. The process in this case is "subtractive," since the pigments subtract or absorb some of the wavelengths of light. Magenta (red-violet), yellow, and cyan (blue-green) are called subtractive primaries, or primary pigments. A mixture of blue and yellow pigments yields green, the only color not absorbed by one pigment or the other. A mixture of the three primary pigments produces black.
The scientific description of color, or colorimetry, involves the specification of all relevant properties of a color either subjectively or objectively. The subjective description gives the hue, saturation, and lightness or brightness of a color. Hue refers to what is commonly called color, i.e., red, green, blue-green, orange, etc. Saturation refers to the richness of a hue as compared to a gray of the same brightness; in some color notation systems, saturation is also known as chroma. The brightness of a light source or the lightness of an opaque object is measured on a scale ranging from dim to bright for a source or from black to white for an opaque object (or from black to colorless for a transparent object). In some systems, brightness is called value.
A subjective color notation system provides comparison samples of colors rated according to these three properties. In an objective system for color description, the corresponding properties are dominant wavelength, purity, and luminance. Much of the research in objective color description has been carried out in cooperation with the Commission Internationale de l'Eclairage (CIE), which has set standards for such measurements. In addition to the description of color according to these physical and psychological standards, a number of color-related physiological and psychological phenomena have been studied. These include color constancy under varying viewing conditions, color contrast, afterimages, and advancing and retreating colors.
Color has long been used to represent affiliations and loyalties (e.g., school or regimental colors) and as a symbol of various moods (e.g., red with rage) and qualities (e.g., worthy of a blue ribbon). A well-known use of the symbolism of color is in the liturgical colors of the Western Church, according to which the color of the vestments varies through the ecclesiastical calendar; e.g., purple (i.e., violet) is the color of Advent and Lent; white, of Easter; and red, of the feasts of the martyrs.
About the Author
Dr.Badruddin Khan teaches Chemistry in the University of Kashmir, Srinagar, India.
Primary Colors
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Primary Colors A Novel of Politics by Anonymous Joe Klein 0446604275 US $5.47
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Primary Colors DVD 1998 Anamorphic Widescreen US $4.99
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FABRIC PANEL CUTE CAT NIPS WALL HANGING CRAFTS BRIGHT PRIMARY COLORS VTNS US $2.30
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4 PYREX PRIMARY COLORS BOWLS YELLOW GREEN RED BLUE US $75.00
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VINTAGE SET OF 4 MARIMEKKO VINYL PLACEMATS FLOWERS PRIMARY COLORS US $19.99
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New never opened Making Memories Slice Primary Color Drawing Tips US $.99
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 Primary Colors A Novel of Politics 1996 Hardcover US $1.49
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