An image generation request is received, where the image generation request includes an image format of an image for generation. A static image corresponding to the received image generation request is obtained. Based on the image format, a plurality of sub-images for generation and corresponding to the image awaiting generation based on the image format is determined. Description information is obtained for each sub-image of the plurality of sub-images. Based on the description information for each sub-image, the plurality of sub-images are sorted as a plurality of sorted sub-images. The image is generated by generating, pre-processing, and adding each particular sub-image of the plurality of sub-images to an image file corresponding to the image format.