four color photometry

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• Color space — A comparison of the chromaticities enclosed by some color spaces. A color model is an abstract mathematical model describing the way colors can be represented as tuples of numbers, typically as three or four values or color components (e.g. RGB… …   Wikipedia

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• Bengt Strömgren — Bengt Georg Daniel Strömgren (January 21 1908 ndash; July 4 1987) was a Danish astronomer and astrophysicist.Bengt Strömgren was born in Gothenburg. His parents were Hedvig Strömgren (née Lidforss) and Svante Elis Strömgren, who was professor of… …   Wikipedia

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• Lighting — Not to be confused with lightning. For other uses, see lighting (disambiguation). Low intensity lighting and haze in a concert hall allows laser effects to be visible …   Wikipedia