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Alas, the "secret sauce" is already freely available: http://waifu2x.udp.jp/. The only real difference is the (very, very appreciable) effort to make it commercialized software. Anybody who cares enough to disassemble it for reuse could build the core tech themselves.

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Looking at that project on github[1] I can't help but to think the algorithm need to upsample anime images (like in this project) might be different than the one needed to upsample photos. Anime has the benefit of having a lot of sections of solid colors.

Edit: Actually looking at the source further it appears they also have models for photos as part of that project in addition to the model for anime.

[1] https://github.com/nagadomi/waifu2x

(again that's the guy who did letsenhance) - waifu2x is great for anime, and in some rare cases it even outperforms us. In all the rest of cases - we are 1 head up from waifu, bigjpg, srgan, etc. Feel free to compare.

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