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一、前言彩色图象的印刷复制,首先需将彩色原稿制成黑白分色照相版,然后经晒版、印刷,才能制得彩色复制的印刷品。在彩色复制的全过程中,由于复制条件所限及材料不理想,往往造成复制误差,使影象的阶调(层次)和色调失真。照相制版中,可采用蒙罩技术对影象失真进行校正。这种照相蒙版是印刷复制中不可缺少的科学的校正手段,在照相制版工艺中占有重要地位。
First, the foreword The color image of the print copy, first of all need to be made of black and white color manuscript original color photographs, and then copy, printing, in order to obtain color copy of the print. In the whole process of color reproduction, due to the limitations of copying conditions and materials are not ideal, often result in duplication errors, so that the image of the tone (level) and color tone distortion. Photographic platemaking, masking techniques can be used to correct the image distortion. This photographic mask is an indispensable scientific correction in printing and copying, occupying an important position in the photolithography process.