To color X-ray images for each radiation quality.

An X-ray beam is turned to a testee body S and an X-ray quality control part 5 is driven based on the instruction of a system control part 9 and controls the radiation quality of X-rays along with an X-ray tube control part 4. The X-ray beam is passed through the X-ray quality control part 5 and the testee body S and then irradiated to the X-ray detector 2 and the output of the X-ray detector 2 is transferred to an image processing part 10 as image signals. By the image processing part 10, coloring is performed for each radiation quality of the obtained image signals. Thereafter, the correction of image data, space filtering and a recursive processing, etc., are performed in real time, a gradation processing, scattering line correction and a DR compression processing, etc., are performed in addition and the processed images are displayed at a display 12.