Image processing apparatus and image processing system

An image processing apparatus includes a parameter estimation unit (302) that estimates a first parameter for aligning first output image data with original image data and a second parameter for aligning second output image data with the original image data, a pixel value mapping unit (303) that generates first pixel value mapping data associating color components of a pixel of the first output image data with color components of a corresponding pixel of the original image data and second pixel value mapping data associating color components of a pixel of the second output image data with color components of a corresponding pixel of the original image data, a map estimation unit (304) that obtains a first map and a second map based on the first and second pixel value mapping data, and a conversion unit (305) that converts a pixel value of the original image data based on the first map and the second map.