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亮度對比

視野中觀看目標與其貼鄰背景的亮度差同背景亮度之比。

亮度對比是指視野中觀看目標與其貼鄰背景的亮度差同背景亮度之比。符號為C。一般以面積較大部分為背景，面積較小的部分為目標。目標亮度大于背景亮度時叫正對比，其C值的變動范圍為0-∞；目標亮度小于背景高度時叫負對比，C值范圍為0-1。對于均勻照明的無光澤材料的背景和目標，亮度對比可以用反射比表示。

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