折本は，印刷·出版·製本·宣伝広告·メーリング等で欠かせない役割をもつ．（1）書籍用頁折では4～32頁等が有り，手帳折では平行巻き16頁平行二つ折＋直角巻き四つ折の16頁などがある．（2）商業印刷用折では，パンフレット／カタログ等の平行二つ折，カンノン折，ジグザグ折など，ダイレクトメ－ルは，A3用紙対応の平行二つ折＋直角巻き三つ折などがある．（3）特殊折では，経本がジグザグ折加工され，地図は開閉しやすく折り皺の抑制を避ける折り方がされる．紙折機は手折りした折見本を広げて折部分を採寸して，給紙部・紙搬送部・羽折部の各寸法設定と紙厚ローラーギャップ調整を行う．この作業は10分～60分位時間を要するが最近ではコンピュ－タ制御が可能となっている．紙折機の加工方法は，平行折は羽折，直角折は羽折式とナイフ折式がある．

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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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