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 rdand the 4thstep. 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 %).