An image processing apparatus, including: an output image processing section which performs, on image data, predetermined image processing according to image formation; an output section that outputs processed image data, on which the image processing is performed, in accordance with an operation timing according to the image formation by an image forming section; a correction section which corrects setting of the image processing on the image data; an image processing control section which controls an operation of the output image processing section, stores the processed image data in an external storage section and controls the correction section to perform correction depending on a predetermined correction condition; and an output control section which reads out the processed image data from the external storage section and inputs the processed image data to the output section.

An image forming apparatus includes a character drawer and a storage device. The character drawer creates a graphic image of a character contained in print data. The storage device stores the graphic image created by the character drawer. When the graphic image of the character is absent in the storage device, the character drawer creates a graphic image of the character and allows the created graphic image to be stored in the storage device.

A printing device includes a printing engine, a storage unit, and a controller. The printing engine prints on a printing medium. The storage unit stores an overall patch image including patches for color calibration for printing an image based on image data. The patches include basic patches corresponding to predetermined colors. The overall patch image has a first patch area in which the basic patches are arranged and a second patch area different from the first patch area. The controller performs: generating a specified patch that is a patch for a color specified by a user in a preview image corresponding to the image; and printing the overall patch image using the printing engine. In a case where the specified patch is generated, in the printing the generated specified patch is printed in the first patch area and one of the basic patches is printed in the second patch area.