Abstract: A computer implemented method to modify an intermediate representation of graphics data written in a page description language is described. The method renders the graphics data to produce a print preview representation stored as intermediate graphics data in an intermediate graphics format. A modifying operation for modifying graphics content of the print preview representation is detected, and the method determines whether the print preview representation contains information about the graphics data required to perform the modifying operation based on a class of the modifying operation and a content of the print preview representation affected by the detected modifying operation. Where the print preview representation contains information required to perform the modifying operation, the print preview representation is modified, and otherwise the method utilizes the graphics data written in the page description language to apply the modifying operation.

Abstract: A computer implemented method to modify an intermediate representation of graphics data written in a page description language is described. The method renders the graphics data to produce a print preview representation stored as intermediate graphics data in an intermediate graphics format. A modifying operation for modifying graphics content of the print preview representation is detected, and the method determines whether the print preview representation contains information about the graphics data required to perform the modifying operation based on a class of the modifying operation and a content of the print preview representation affected by the detected modifying operation. Where the print preview representation contains information required to perform the modifying operation, the print preview representation is modified, and otherwise the method utilises the graphics data written in the page description language to apply the modifying operation.

Abstract: A method of printing document data in page description language format using a plurality of graphics processing units. The plurality of tiles representing the document using the assigned graphics processing units are rendered in parallel with one another, and the rendered tiles are transmitted, bypassing the central processing units, from each of the graphics processing units to a corresponding one of a plurality of print head controllers, with the rendered tiles transmitted at a higher frequency than a frequency at which the plurality of tiles is output from each print head controller. The rendered tiles are repeatedly transmitted until each print head controller completes output of the previous band.

Abstract: A method of printing document data in page description language format using a plurality of graphics processing units. The plurality of tiles representing the document using the assigned graphics processing units are rendered in parallel with one another, and the rendered tiles are transmitted, bypassing the central processing units, from each of the graphics processing units to a corresponding one of a plurality of print head controllers, with the rendered tiles transmitted at a higher frequency than a frequency at which the plurality of tiles is output from each print head controller. The rendered tiles are repeatedly transmitted until each print head controller completes output of the previous band.