A digital prepress system capable of preparing an excellent proof sheet free from the wrong conversion of characters and double procedure of trapping processing, having little color difference of images between the proof sheet and the regular printed matters and imparting no impression that proofreading paper and regular printing paper are different in the color tone, feeling of gloss and the like. This invention provides a digital prepress system wherein digital data are processed on a unit of Raster image processor and data obtained therefrom are transferred to a planographic print output unit and an ink jet printer to generate a planographic print and a proof sheet respectively, said ink jet printer includes a device for preparing said proof sheet to make ink jet recording on a proofreading paper having a color difference of 2 or less and a gloss difference of 75° specular gloss in an absolute value of 15 or less as compared with regular printing paper according to the provisions of JIS 28730, with the basis weight different from that of regular printing paper by a range between −10 to +50%.
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