In an image processing device, image data is divided into a plurality of band data including first and second band data. The first band data and the second band data have an overlap region, from which the first and second regions are extracted, respectively. The first region and the second region at least partially overlap with each other in the overlap region and have attributes different from each other, and the respective feature amounts are calculated. Based on these feature amounts, an attribute to be used for correction is decided. Then, an attribute different from the decided attribute between the attribute of the first region and the attribute of the second region is changed to the decided attribute.