1. A radiographic image processing device comprising: a frequency resolution unit for performing frequency resolution of a radiographic image captured by irradiating an object with radiation to generate band images representing frequency components in a plurality of frequency bands; a reference image generation unit for generating a reference image representing information associated with scattered radiation included in the radiographic image from the radiographic image and generating a plurality of band reference images corresponding to the plurality of frequency bands from the reference image; a band image conversion unit for performing conversion between the corresponding pixels of the band reference images and the band images in the corresponding frequency bands to generate converted band images; and a synthesis unit for synthesizing the converted band images to generate a processed radiographic image with converted contrast.