Patent ID: 8199385

Claim:
An image forming apparatus to save toner, comprising: a storage unit to store a first halftone table and a second halftone table, the first halftone table having a Lines Per Inch (LPI) higher than the second halftone table; and a halftoning processor to generate and to output a halftoning result by comparing gray level values corresponding to pixels of received input image data with grayscale values of the first halftone table if a command signal to print is received in a toner saving mode, and by comparing gray level values corresponding to pixels of the received input image data with grayscale values of the second halftone table if a command signal to print is received in a non-toner saving mode, wherein a size of toner dots corresponding to the halftoning result in the toner saving mode is less than a size of toner dots corresponding to the halftoning result in the non-toner saving mode.