| 摘要 |
A printer converts print data in page description language into coded band data as a set of objects such as run-length data, trapezoid data and the like, in band units. Processing time to generate raster data from the coded band data is predicted, and the predicted time is used for determining whether or not the raster-data generation takes time longer than time for transmitting data to a printer engine. If it is determined that the raster-data generation time is longer than the data transmission time, raster data is generated from coded band data, and compressed and stored as preparation for printing. At this time, preparatory compression is performed to predict time for expanding the compressed data, for determining whether or not time for expansion is longer than data transmission time. If the expansion time is longer than the data trasnmission time, a coding method is changed, and the preparatory compression is performed again. If the expansion time is not longer than the data transmission time, the data is compressed and stored.
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