Method of fixing bad quality output

[ghost]

I found a way to fix a bad quality output that I wanted to share. I could implement this fix into the extras tab myself, but I would rather really like to see this implemented by an experienced python coder in the right way.

Often my output looks like this, with highres.fix activated:

The details have artifacts and it doesnt look nice. I tried adding bad image quality or ((jpeg-artifacts)) to negative prompt but it doesnt really help most of the time, or it changes the artist combo into something weird.

If you apply SwinIR4x to the image, and scale it back to the original resolution, the artifacts are gone:

It looks much nicer, the details are clear, even colors are a bit enhanced. So if you have a good artist combo that produces bad quality, there is a way to save the renders. With a bit more photoshop magic you will have a very nice output again

[papersplease]

SwinIR is a third-party blind upscaler. It works, but it doesn't have any knowledge on how SD generates images, and just adds its own details to what it thinks is there. To get the most out of your blurry picture, try running it through img2img or any kind of tiled SD upscale instead; that way the details will be sourced from SD itself.

[ghost]

img2img wont get rid of the artifacts with the same prompt. If I dont use a prompt and let SD guess what is in the picture, it can work, but its rare.

I dont know why the output sometimes comes out like this. It just looks terrible. This is my attempt to improve the outcome

[cgessai]

Out of curiosity, have you tried the "Scale Latent" sub-option of "Hires. fix"? I did some tests last week and ticking that option seemed to produce slightly "fuller" results. I agree SwinIR can be pretty freaking nifty, tho.

[ghost]

Yes I do use scale latent pretty often. Sometimes it does change the output for the better, but not always