Applying the enhanced improved Retinex algorithm to deal with the radiographic images,the contrast and the quality of the original images can be improved,and the best visual effects of the minutia area are achieved.The theoretical analysis and the result of the experiment indicate that this algorithm compared with other algorithms,such as homomorphism filter and gray equalize，which can effectively enhance contrast,control the context and noise.After enhanced the radiographic images by using this algorithm,the images will have better contrast than the first and second algorithms.