The image processing apparatus includes an image processing section for executing at least one image processing operation with respect to digital image data and a set value chancing device for selecting a plurality of image processing conditions as to said at least one image processing operation from among plural levels or plural combinations which are typically preset of image processing conditions, and changing set values of the plurality of image processing conditions from previously set values into the selected plurality of image processing conditions. The customized printing system includes the image processing apparatus, an image input apparatus and an image output apparatus. The image processing apparatus is capable of executing the image processing operation or operations in response to a printing order customized by a customer, and the system is capable of forming a print which may reflect the requests from the customer.