An image processing apparatus for performing gamma correction and edge correction on the image and for generating a noiseless image. The image processing apparatus includes a gamma correction unit for performing gamma correction on the image; an edge extraction unit for extracting an edge portion of the image on which gamma correction is performed by said gamma correction unit; a correction coefficient generation unit for generating a correction coefficient based on gamma correction performed by said gamma correction unit; an edge-image generation unit for generating edge-image data by multiplying the correction coefficient to image data of the edge portion; and an adding unit for adding the edge-image data to the image data of the image on which gamma correction is performed by said gamma correction unit. The correction coefficient generation unit generates the correction coefficient based on an inverse of a differential coefficient of a gamma correction curve of the gamma correction at the brightness of each pixel for each of the pixel of the image. The correction coefficient generation unit replaces the correction coefficient with a predetermined value when the brightness of the pixel is larger than a predetermined threshold.