本文讨论了银盐干板经过漂白而获得位相编码片的整个过程的传递特性,说明了编码片所具有的不同位相光栅结构,并计算了由此不同结构和光源色温所决定的色度曲线。分析了胶片的非线性效应对位相光栅调制深度及编码效果的影响。 In this paper, we discuss the transfer characteristics of the silver salt dry plate obtained by bleaching to obtain the phase coded piece. The different phase grating structure of the coded piece is explained, and the chromaticity curve determined by the different structure and the color temperature of the light source is calculated. The influence of the non-linear effect of the film on the depth of the phase grating modulation and the encoding effect is analyzed.