The present disclosure relates to an image processing device, an image forming apparatus, and a computer-readable non-transitory storage medium with an image processing program stored thereon and, more particularly, to image processing in which an amount of toner used in printing is reduced.
In image forming apparatuses such as a copier and a printer, technology for performing image processing in which image data serving as a printing target is reduced for the purpose of n-up printing in which printing is performed on one sheet of recording paper on which multiple pages of a document are collected is used. When copies of the multiple pages are printed by the n-up printing, recording paper can be saved. Further, in the image forming apparatuses, technology for performing toner-saving printing by performing image processing in which image data is masked using a preset mask pattern to reduce an amount of toner used when an image of a printing target is printed is also used.