A radiation image processing apparatus which improves contrast and sharpness of radiation images is provided. According to this radiation image processing apparatus, comparison is made between a first image data obtained by radiation imaging without going through the subject but through a grid for removing scattered radiation from a subject, and a second image data which is obtained by radiation imaging through the subject and the grid, and a two-dimensional distribution of abundance of scattered component is calculated. Using this two-dimensional distribution of scattered component, abundance of scattered radiation is locally determined at each position, and a sharpening process is performed with sharpening intensities that are increased in response to abundance of scattered radiation.
