Color vision · Coloration blindness · Visible spectrum · Colour constancy · Shade term · Colour theory · Complementary color
Hue · Lightness · Colorfulness · Additive color · Subtractive color · Primary color · Secondary color · Tertiary color
An additive coloration model involves light emitted directly from a source or illuminant of some sort. The additive reproduction process usually uses red, green and blue light to produce the other colors. Combining one of these additive primary colors with another in equal amounts produces the additive secondary colors cyan, magenta, and yellow. Combining all three primary lights (colors) in equal intensities produces white. Varying the luminosity of each light (shade) eventually reveals the full gamut of those three lights (colors).
Computer monitors and televisions use a system called optical mixing and cannot be considered additive light because the colors do not overlap. The red green and blue pixels are side-by-side. When a green color appears, only the green pixels light up. When a cyan colour appears, both green and blue pixels light up. When white appears all the pixels light up. Because the pixels are so small and close together our eyes blend them together, having a similar effect as additive light. Another common use of additive light is the projected light used in theatrical lighting (plays, concerts, circus shows, night clubs, etc.).
Results obtained when mixing additive colors are often counterintuitive for people accustomed to the more everyday subtractive colour system of pigments, dyes, inks and other substances which present color to the eye by reflection rather than emission. For example,
Windows 7 Professional, in subtractive colour systems green is a combination of yellow and blue; in additive colour, red + green = yellow and no simple combination will yield green. Additive color is a result of the way the eye detects color, and is not a property of light. There is a vast difference between yellow light, with a wavelength of approximately 580 nm,
Windows 7 Professional, and a mixture of red and green light. However, both stimulate our eyes in a similar manner, so we do not detect that difference. (see eye (cytology), shade vision.)
James Clerk Maxwell is credited as being the father of additive color.[1] He had the photographer Thomas Sutton photograph a tartan ribbon on black-and-white film three times, first with a red,
Windows 7 Discount, then green, then blue color filter over the lens. The three black-and-white images were developed and then projected onto a screen with three different projectors, each equipped with the corresponding red, green, or blue coloration filter used to take its image. When brought into alignment, the three images (a black-and-red image,
Windows 7 Enterprise Key, a black-and-green image and a black-and-blue image) formed a full colour image,
Office 2007 Pro Plus, thus demonstrating the principles of additive coloration.[2]
[edit] See also Color mixing
Color theory
Shade film (motion picture)
Kinemacolor
Prizma Color
RGB colour model
Subtractive colour
Technicolor
William Friese-Greene [edit] References [edit] External links - Photos and stories from the James Clerk Maxwell Foundation.
Stanford University CS 178 interactive Flash demo comparing additive and subtractive colour mixing.
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