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EIA GRAY SCALE
技术参数
Data: The EIA grayscale pattern is a standard 2" square projection slide. It contains two parallel gray scales. The upper scale has nine nominally equal transmission steps while the lower contains the same number of nominally equal density steps. The transmission values range from 3% to 60%, corresponding to density values of 1.52 and 0.22 respectively. The slide is chrome on glass and densities are achieved by a fine halftone pattern.
9阶灰度卡YE0108用于电子摄像机的色调再现性的评估。两个9阶灰度块逆向排列在灰色背景上(D≈0.75),灰度刻度为对数级别(gamma=0.45)。利用两个相反的9阶线性步进信号产生最佳的相机伽马矫正值。这灰度测试卡的对比度范围为50:1。
级别 Step |
密度 Density |
反射率 % Reflectance in % |
输出电压 % Output voltage in % |
1 | 0.15 | 71 | 100 |
2 | 0.26 | 55 | 88.75 |
3 | 0.37 | 42 | 77.5 |
4 | 0.51 | 31 | 66.25 |
5 | 0.67 | 22 | 55 |
6 | 0.85 | 14 | 43.75 |
7 | 1.09 | 8 | 32.5 |
8 | 1.40 | 4 | 21.25 |
9 | 1.85 | 1 | 10 |
这个密度值是基于BaSO4=0的密度。纯黑色和纯白色区域在灰阶之间。黑色块密度为D>2.4(反射率>0.5%),白色块密度为0.09(反射率=79%)。
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