Patent ID: 8638472

Claim:
An image processing device comprising: a processor; a storage device; and a memory storing computer executable instructions that, when executed by the processor, cause the image processing device to: sequentially acquire at least two pieces of image data as partial image data; determine if a first piece of image data of the at least two pieces of image data includes a gray object; convert the first piece of image data into both first multi-color data and single color black data responsive to determining that the first piece of image data includes the gray object, the first multi-color data expressing the gray object by a combination of densities of multi-colors, the single color black data expressing the gray object by a single color black; store both the first multi-color data and the single color black data in the storage device; determine if a second piece of image data acquired after the first piece of image data includes a chromatic color object; output the first multi-color data for the first piece of image data including the gray object from the storage device responsive to determining that the second piece of image data acquired after the first piece of image data including the gray object includes the chromatic color object; convert any piece of image data acquired after the second piece of image data including the chromatic color object into second multi-color data, the second multi-color data expressing any object by a combination of densities of multiple colors; output the second multi-color data; and output the single color black data for the first piece of image data including the gray object from the storage device responsive to the sequential acquisition of the at least two pieces of image data being completed without acquiring any piece of image data including the chromatic color object.