Patent ID: 8363264

Claim:
A data transmission apparatus which transmits data relating to an image to be recorded on a recording medium to an ink-jet recording apparatus comprising a conveyor which conveys a recording medium and a line-type ink-jet head which is elongated in a direction perpendicular to a conveyance direction of the recording medium conveyed by the conveyor, formed with an ejection face having a plurality of ejection openings arranged in a matrix pattern, and fixed at a position opposing a conveyance path of the recording medium when ejecting ink droplets, the data transmission apparatus comprising: a data generation unit which generates an image data block comprising a plurality of dot data lines each formed for each of the ejection openings and each made up of a plurality of dot data elements corresponding to a plurality of dots arranged in the conveyance direction in the image to be recorded on the recording medium with an arrangement order of the plurality of dot data elements corresponding to an arrangement order of the corresponding dots in the conveyance direction; a data compression unit which compresses each of the plurality of dot data lines of the image data block generated by the data generation unit, based on the arrangement order of the plurality of dot data elements of the each of the plurality of dot data lines; and a data transmission unit which transmits a compressed file generated by the data compression unit to the ink-jet recording apparatus.