https://wccftech.com/the-witcher-3-ai-4k-upscaled-project/

A new The Witcher 3 texture modding project has been revealed today, aiming to upscale all of the game's texture to 4K resolution with the help of AI.

The first release of The Witcher 3 AI 4K Upscaled Project by Rfuzzo includes all of the Vizima exclusive texture upscaled to 4K resolution. The results are definitely good, but the modder himself highlights how hand-crafted 4K textures are often a better alternative to AI upscaling, and the project may have other uses than simply offering better quality textures.