[in Japanese]

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"Postpress" indicates post-processing of print. This article introduces the variety of post-processing techniques and some of print media made by the combination of the techniques. The intention of digitalization and automation in terms of "Postpress" is interpreted. Moreover, it refers to the functions, in-line processing and future challenges of the "Postpress".

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Required quality of the types, methods etc. of the post press of offset printed materials were discussed. The minimum requirement for surface processing materials and problems of actual process as well as characters of different types of based ink were studied. The new trend of the mechanism and material of in-line offset printing and the representative differentiated method were introduced. In addition to surface decoration and surface protection which are the original requirement for post press, the future trend represents by the keyword of its environmental correspondence and differentiation were studied.

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These days, soft proof, which checks color images of printed matter on a monitor, is widely used in the field of graphic arts. In order to provide high quality soft proofing system, it is necessary to calibrate the tone reproduction curve and the chromaticity of white point of a monitor to desire characteristics and to make an ICC display profile. In such a background, we developed a method to calibrate them with low cost and high quality by visual calibration. This paper reports the principle and calibration accuracy of our method. In general, it is well known to adjust brightness of a continuous tone image with that of a binary image on a monitor for calibrating tone reproduction curve of the monitor. On the other hand, our method adjusts brightness and hue of three continuous tone images to those of binary images. As a result, our method can calibrate nonlinear tone curve of LCD accurately. In addition, our method can be applied to many viewing illumination conditions, because our method adjusts a color of white point of the monitor to that of target paper under a viewing illumination. Three experiments using three different LCDs were done to test the calibration accuracy of our method. The results of the experiment show the monitors calibrated by our method have enough accuracy for soft proof.

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