Image processing device, imaging device, image printing device, control method for image processing device, and image processing program

With the present invention, it is possible to curb deteriorations in image quality of output images. A control unit (40) comprises: a correction strength determining unit (43) which determines a firstscaling factor for reducing a reduction region which includes an object, and a second scaling factor for enlarging an enlarging region; and an image correction unit (44) which uses the first scalingfactor and the second scaling factor to correct an input image. The correction strength determining unit determines the first scaling factor on the basis of the second scaling factor and the width ofa first region and a second region in the input image. 本公开能够抑制输出图像中的画质劣化。控制部(40)具备：校正强度确定部(43)，确定用于缩小包括被摄体的缩小区域的第一倍率和用于放大放大区域的第二倍率；以及图像校正部(44)，使用第一倍率以及第二倍率来校正输入图像。校正强度确定部基于第二倍率和输入图像中的第一区域以及第二区域的宽度来确定第一倍率。