That's what I meant when i said it sometimes needs different upscale setting on some games.
Adding in an effect with scaling can help you scale it the rest of the way. Nearest was what I tried first, but then I found anime4k_3d_upscale also scaled it up.
They do have a list of effects, and what each one does. It's a bit... confusing to use, and I'm probably not using it optimally either since I haven't found a guide that adequately explains it all. Instead I kind of just throw effects at any game that seems... excessively low resolution until I find a combination that satisfies me.
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, Scaling is needed to output display resolution. It isn't the most user friendly tool, but its free. /shrug.
On the profiles page you can choose a scaling mode, and on the scaling configuration page if you click on a mode you can configure which effects to use. Unfortunately upscaling isn't free, so if you go nuts with options... You can just end up with maximum amount of load on your computer, and minimum amount of actual improvement.
Currently I'm experimenting with Anime4k upscale denoise, Anime4K_3D_Upscale, and using lanczos as a default downscaler. There's probably still improvements I could find, but again I'm also still experimenting.