| 摘要 |
PROBLEM TO BE SOLVED: To improve the speed of plotting processing without accessing the whole printing instruction file in each printing instruction differently from a conventional method in a banding method for dividing pages into plural bands and preparing a raster image in each band. SOLUTION: In addition to a printing instruction file 11c for recording all printing instructions issued by a program, a printing instruction index file 11f for recording the printing instruction numbers of all printing instructions, start band numbers and end band numbers expressing the plotting start and end band positions of respective printing instructions and printing instruction recording positions expressing printing instruction recording positions in the file 11c is prepared and a printing instruction necessary for each band is acquired from the file 11c by referring to the file 11f to execute plotting processing.
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