For radiance images on the top of atmosphere obtained by wide field of view (WFV) camera in GaoFen-1 (GF-1) satellite, atmospheric corrections at four bands are made to obtain surface reflectance images based on 6S atmospheric radiation transmission model, aerosol optical depth from Terra in Moderate-Resolution Imaging Spectroradiometer (MODIS) and the parameter products (MCD43A1) of MODIS bi-directional reflection distribution function model. Then the calculation methods of the image definition values are based on Brenner gradient operator and medium frequency discrete cosine transform. The calculation results show that the image definition values after correction are higher than those before correction, so the edge texture information of the image after correction is clearer than that before correction. The signal-to-noise ratio (SNR) is evaluated based on the principle of threshold segmentation. The results show that the SNR of each band before and after correction has an increasing relationship with the radiance. The atmosphere has more influence on the short-wave band than the long-wave band.