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5阶灰度测试卡

时间:2017-02-14    热度:
  • 品牌:ESSER爱莎/Sine Image
    型号:TE109
    尺寸:可定制
    材料:菲林/高清相纸
    比例:4:3
    类型:反射式/透射式可选
  • 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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