Vertex Video Accucharts
Vertex Accu-Chart 9 Step EIA Type Grey Scale Chart
With an overall size of 16.5" x 10" with an image area measuring 9" x 12" (23 x 30.5 cm). Original standard in U.S. for setting light response characteristics of TV cameras. Use for adjusting dynamic range and for balancing R, G and B channels for correct color reproduction. Chart consists of 2 sets of 9 neutral grey patches on a uniform grey background. Reflectances range from 3% to 60% in accordance with RS-170 (Logarithmic 2 law = approx. 1/2 f/stop per step). Dead black patch (R less than 0.5%) establishes accurate black level and for use in setting flare compensation.