A method and an apparatus for processing an image are disclosed in the embodiment of the present application. One specific embodiment of the method includes: acquiring a fog image to be processed, andperforming minimum filtering on the fog image to be processed to obtain a gray scale image of the fog image to be processed; selecting a target number of pixel points from the gray scale image in anorder of pixel values from large to small, and determining an image region corresponding to the selected pixel points from a fog image to be processed; acquiring pixel values of pixel points includedin the image region, and determining atmospheric light values based on the acquired pixel values; based on the gray image and atmospheric light value, defogging the fog image to be processed, and obtaining the processed image. This embodiment improves the effect of image display and the efficiency of image processing.