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upscayl
🆙 Upscayl - Free and Open Source AI Image Upscaler for Linux, MacOS and Windows built with Linux-First philosophy.
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waifu2x-ncnn-vulkan
waifu2x converter ncnn version, runs fast on intel / amd / nvidia / apple-silicon GPU with vulkan
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chaiNNer
A node-based image processing GUI aimed at making chaining image processing tasks easy and customizable. Born as an AI upscaling application, chaiNNer has grown into an extremely flexible and powerful programmatic image processing application.
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WorkOS
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Apparently it's a known issue: https://github.com/Djdefrag/QualityScaler/issues/21
A VERY similar project was submitted to Awesome F/OSS, Upscayl:
https://github.com/upscayl/upscayl
Wonder what the comparison is…
For anyone interested in different upscaling models, there is a collection in the wiki here:
https://upscale.wiki/wiki/Model_Database
My personal favourite is Remacri for photographs, but you should download a few of them and try what works best for the photo/image you have.
You can use either Automatic1111's repo for stable diffusion to try them out (put the model file in the ESGRAN directory), or also chaiNNer (https://github.com/chaiNNer-org/chaiNNer)