An image processing apparatus performs an edge correction process for image signals of respective pixels sequentially inputted, each image signal having a density level corresponding to a pixel. An edge amount detector of the image processing apparatus calculates a difference between a density level of an image signal of a specified pixel predetermined from among the image signals and a product of a predetermined value and the sum of the density levels of peripheral pixels located at a predetermined distance from the specified pixel, and outputs a detection signal having a level of an edge amount of the calculated difference, and an edge amount convertor converts the edge amount of the detection signal into a converted edge amount in a predetermined manner, and outputs a conversion signal having level of the converted edge amount. Further, an adder adds the converted edge amount of the conversion signal to the density level of the image signal of the specified pixel, and outputs an image signal of the specified pixel having a level of the addition result, for which the edge correction process has been performed. The image processing apparatus may be made part of a digital copying machine.