伽玛值设置或校正是一种控制显示器显示颜色的简单实用方法。对条纹混色比色法视觉估计伽玛值的精度进行了研究, 包括同一实验者的重复性、不同实验者的一致性、视觉估计与仪器测量结果的比较、混合条纹亮暗的选择对精度的影响。在hp CRT显示器上进行的实验结果表明, 同一实验者有很高的重复性; 不同实验者的差别较小; 视觉估计红、绿、蓝和亮度通道的伽玛值的平均值分别是2.18、2.17、2.40、2.20, 仪器测量得到的伽玛值的标准值分别是2.13、2.05、2.37、2.09。视觉估计和仪器测量的伽玛值差距约为0.08,适当选择亮、暗混合条纹不仅容易混合匹配, 估计伽玛值与仪器测量结果更接近。

Setting or calibrating gamma value is a simple and practical method for controlling color on computer displays. The accuracy of visual estimating gamma value of CRT displays is investigated by using the stripe photometry method. The investigated factors include stability for one subject, consistency for different subjects, influence of stripe with different luminance levels. The estimated results were compared with ones measured by instruments. The experiments were conducted on hp 21″ CRT display. The results show that the same operator’s matching result is very stable and matching values vary little for different subjects, gamma mean values by visual estimation for R, G, B and luminance channels are 2.18, 2.17, 2.40, 2.20, and the measured values are 2.13, 2.05, 2.37, 2.09 respectively. The difference between estimated and measured gamma values is about 0.08. Appropriate choice of stripe with different luminance levels will make visual matching more easily, and the estimated gamma value is more adjacent to the measured value.