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5階灰度測試卡

品牌:ESSER愛莎/Sine Image
型號:TE109
尺寸:可定製
材料:菲林/高清相紙
比例:4:3
類型:反射式/透射式可選

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產品介紹

Two 5-graduated counter current gray scales are arranged on a gray background (D=0.83), the gray scales being graduated logarithmically. Related to the densities of the gray scales: gamma= 0.45. Related to the remission values (brightness): gamma = 2.2, that being exactly the reciprocal value of gamma = 0.45.

The signal of the background is in the middle of the 3 rd and the 4th step. The output of an optimally gamma-corrected camera yields two 5-graduated counter current linear step signals. The contrast range of the gray scales is 40: 1.

The values of the 5-graduated gray scale are as follows:

 
Step Density Reflectance in % Output voltage in %
1 0.15 71 100
2 0.37 43 77.5
3 0.65 22 55
4 1.05 9 32.5
5 1.75 2 10
 

The density values are based on a density of BaO4S=0. A field of black velvet is located between the gray scales. The density of this field is D > 2.4 (reflectance < 0.5 %).

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