Grey scale Small optical wedges of continuous-tone images with orderly and progressive densities.They are available in various sizes and shapes to control half -tones, colour separation, and printing characteristics.

• 控制半色调、分色和晒印特性用的光学梯尺。它是连续色调影像,具秩序井然的累进密度并有不同大小尺寸和形状。