1. A method for processing an image, applicable to an electronic device including an image acquisition unit corresponding to an image acquisition area, wherein the method comprises: generating a first image and a second image according to an object to be acquired in the image acquisition area at a first instance of time, wherein both the first image and the second image are images corresponding to the object to be acquired, and the amount of data of the first image is larger than the amount of data of the second image; and storing the first image and the second image and setting the second image as an associated image of the first image.