Waifu2x in particular, is one of the oldest and still one of the best AI upscalers for anime and drawings in general, and it has always heavily favored Nvidia. The most known port was not the original Waifu2x by nagadomi, but Waifu2x-caffe, which was much more feature rich, and supported CUDA and cuDNN, both Nvidia exclusive. There was an OpenCL alternative which worked on AMD, but it was only as fast as... Source: over 1 year ago
If you need to enhance the quality of an image that isn't single-coloured; use an AI such as Waifu2x Vulkan or Waifu2x Caffe. Source: almost 2 years ago
It's open source software just as many other projects on github are. Can't really help you translate, but the program is in many languages including English the author is just Japanese Https://github.com/lltcggie/waifu2x-caffe If you scroll down you'll see some English text. Source: almost 2 years ago
The settings I used for the original upscale (using waifu2x-caffe):. Source: almost 2 years ago
Resolution improved to 3000x1240 using waifu2x-caffe. Source: about 2 years ago
Waifu2x-Caffe, or another really good GUI for Waifu2x would be Waifu2x Extension Gui. Source: almost 3 years ago
Upscaled and slightly denoised using waifu2x-caffe for Windows (Conversion mode `Denoise and Magnify`, Denoise Level `Level 1`). Source: about 3 years ago
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