Image caching in an open prepress interface

Abstract

An improved method of Open Prepress Interface (OPI) processing of a page containing text and a picture. A low resolution Postscript Master is made from the text and a low resolution version of the picture, the result being sent to the OPI consumer. Here, processes that can be accomplished with the low resolution picture, such as location and cropping, are accomplished. Next, the low resolution picture is replaced with the high resolution version, and high resolution image processes are done, such as rotation and scaling for the intended printer. The result is stored. Finally, a printer's Postscript interpreter is used to generate a raster and the picture is printed. The advantage is that if a change needs to be made to the page after printing, the high resolution picture from storage can be used so that the high resolution image processing need not be repeated

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