An image processing apparatus includes a first color determining device, a storage device, a second color determining device, an output image processing device, and a controller. The controller compares between a first area of input image data and a second area of the input image data to generate a comparison result. When the comparison result indicates that the second area of the input image data does not match the first area of the input image data, the controller causes the second color determining device to generate the second determination result and causes the output image data to be generated based on the second determination result. When the comparison result indicates that the second area of the input image data matches the first area of the input image data, the controller causes the output image processing device to apply image processing determined based on the first determination result.