An image processing apparatus includes an acquisition unit that acquires, from image data acquired in such a manner that a chart formed by an image forming unit is read, a line signal value from pixel values of pixels for a line arranged in a first direction of the chart and a line representative value by using line signal values respectively acquired from a plurality of lines adjacent to each other in a second direction different from the first direction of the chart, and a determination unit that determines a portion where a streak is generated in the second direction by using a difference between a first representative value and a second representative value.