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Resize and Make Image Larger With Waifu2x
Waifu2x is an open source tool and can greatly enlarge an image to double its size pretty quickly. If you want, you can sneak into its code and see how it works. You can find its code base on GitHub. Also, the process is using this tool to enlarge an image is very easy. That is because of its user-friendly interface and easy to configure enlarging options.