11-Steps Gray Scale Test Chart
The YE0165 is designed for evaluation the halftone reproduction of 16:9 electronic cameras. Two 11-graduated counter current gray scales are arranged on a gray background (D ≈ 0.56), the gray scale corresponds to the ITU recommendation BT.709.
The output signal of an optimally gamma-corrected camera according to BT.709 generates two counter current, linear step signals.
The contrast range of the gray scale is 40 : 1.
The values of the 11-graduated gray scale are as follows:
|Step||Density||Remission in %||Video signal for BT.709 in %||Video signal for gamma 0.45 in %|
*The production process for reflective charts allow a maximum printed density of 1.64. The target value for the darkest step is 1.70. Therefore the distance of the last step differ slightly.
Two black fields and a white field are located between the gray scales. The density of the black fields in the middle is D > 3 (remission < 0.1 %), the white field between has a density of 0.05 (remission 89.9%).
Adjust the aperture until the lightest patch reaches 100% video signal at the waveform monitor. With an optimally corrected camera according to ITU recommendation BT.709 the darkest patch will reach 10% signal level.
When using this chart with a gamma correction of 0.45 the video signal level for each step will change as listed in the table above.