An image processing device includes a controller. The controller is configured to perform: acquiring image data having a plurality of objects; calculating an amount of characteristic of each of the objects, the amount of characteristic indicating a degree of change in pixel values; setting a process order based on the amount of the characteristic of each of the objects; setting a target value, the target value being a reference value to reduce a data size of the image data; reducing an object data size of at least one of the plurality of objects based on the process order in such a way that the data size of the image data becomes smaller than or equal to the target value, thereby generating a reduced object; and generating reduced image data having a data size smaller than the data size of the image data by using the reduced object.

An image processing device includes: a first gradation-process determining unit that determines a type of gradation process for a process-color toner plate in accordance with halftone mode information; a second gradation-process determining unit that determines a type of gradation process for a special toner plate other than a process color in accordance with the type of gradation process determined by the first gradation-process determining unit; and a halftone processing unit that performs halftone processes in accordance with the types of gradation processes that are determined by the first gradation-process determining unit and the second gradation-process determining unit.

An example embodiment may involve obtaining an ab pixel macro-cell from an image with one or more color planes, and an ab attribute macro-cell. The ab pixel macro-cell may contain 4 non-overlapping mn pixel cells, and the ab attribute macro-cell may contain 4 non-overlapping mn attribute cells. The pixels in the ab pixel macro-cell may be associated with respective color values. The example embodiment may also involve determining 4 attribute output values associated respectively with the 4 non-overlapping mn attribute cells. The example embodiment may further involve determining 1 to 4 color-plane output values for the non-overlapping mn pixel cells, and writing an interleaved representation of the 4 attribute output values and the determined color-plane output values.

An image processing device includes a controller. The controller is configured to perform: acquiring image data having a plurality of objects; calculating an amount of characteristic of each of the objects, the amount of characteristic indicating a degree of change in pixel values; setting a process order based on the amount of the characteristic of each of the objects; setting a target value, the target value being a reference value to reduce a data size of the image data; reducing an object data size of at least one of the plurality of objects based on the process order in such a way that the data size of the image data becomes smaller than or equal to the target value, thereby generating a reduced object; and generating reduced image data having a data size smaller than the data size of the image data by using the reduced object.