1. An image processing apparatus comprising: a geometric correction unit configured to generate a plurality of pieces of pixel value corrected image data having different pixel values based on object information of input image data; a synthesizer configured to select a pixel value to be applied to each pixel from the plurality of pieces of pixel value corrected image data to generate corrected image synthesized data; and a pseudo grayscale processor configured to perform a pseudo grayscale process on the corrected image synthesized data.