Two 11 degree grayscale bars are arranged in opposite directions on a gray background (D ≈ 0.56), and the grayscale bars comply with the ITU BT.709 standard.

According to the BT.709 standard, the output signal of an optimal gamma correction camera produces two segments of inverse linear step signals.

The contrast range of grayscale is 40:1.

Parameter table of 11th level grayscale test card

*The maximum printing density allowed by the production process of reflective test cards is 1.64. The target value for the darkest grayscale is 1.70. Therefore, the distance of the final grayscale will be slightly different.

Two black blocks and one white block are located in the middle of two grayscale bars, with a density of D>3.0 (relief rate<0.1%) for the black blocks. The density of the white square is D=0.05 (relief rate 89.9%).

Recommended use of grayscale test card

Adjust the aperture until the brightest block reaches 100% video signal on the waveform monitor. Using a camera with the best calibration according to ITU BT.709 standard, the blackest block will reach a signal level of 10%.

When using this card for 0.45 gamma correction, the video signal level of each grayscale will change according to the data listed in the table above.