Some Feedback
I downloaded the Qwen version 1k to 4k made many images with it.
It's super fast which is nice.
Upscaling from 1k image is 4k though isn't really that good.
The original 1k image doesn't contain enough pixels data to really create a high quality image in the first place. After upscaling there are artifacts.
It would be far more useful to have a 2 X version that took a 2k image and upscaled to 4k.
I normally generate 2k images with Qwen to start with and use an img-2-img workflow to upscale things to 3.6k which works great and adds details. It's much slower but achieves a much higher quality image than using PID going from 1k to 4k.
The way PID was trained requires exact resolutions too which gives you a lot less flexibility with image resolution choice.
As a result, this technology is not going to replace img-2-img upscales, tiles upscalers or SeedVR2.
Would love to see a 2k to 4k version or a version that does tiling with say 4 X 512X512 tiles upscale.