An image processing device includes a principal partial image selector, a peripheral partial image selector, and a generator. The principal partial image selector selects a principal partial image, from plural partial images that constitute an original image. The peripheral partial image selector selects a peripheral partial image, which is disposed peripherally to the principal partial image in the original image and satisfies a pre-specified condition. The generator generates output image data, in which the principal partial image and the peripheral partial image are placed so as to preserve a positional relationship thereof in the original image, and the principal partial image and the peripheral partial image are reduced with scaling factors so as to be accommodated in output dimensions, a difference between the respective scaling factors being within a pre-specified range.