US Patent 7586630 Print preview apparatus and method

The print preview screen has a button enabling the operator to select the direction in which previewed pages are offset. The print preview screen also has a display screen enabling the operator to specify which sheet is displayed in the foreground in front of all other sheets, which sheet is displayed in the background behind all other sheets, and the offset distance between the stacked sheets. The following process is then repeated for each sheet based on these operator specifications. Data for one sheet is written to a 1-sheet display buffer (30). Data for areas not displayed is then erased from the 1-sheet display buffer (30). The data in the 1-sheet display buffer (30) is then transferred to the display data memory (40).