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The original was posted on /r/stablediffusion by /u/dal_mac on 2024-08-21 05:48:11+00:00.
I spent a couple days trying to adapt my upscale workflows to flux. Hi-res fix (img2img), Ultimate SD upscale (tiled), Supir, etc. All were giving major problems or were far too difficult to get looking right (for example, tiled upscaling causes hallucinations and seams above ~0.35 denoise, while any lower than ~0.3 creates artifacts and/or reduces detail). I couldn't find any combo of parameters that gave me results like XL.
Then I realized.. why do I need to upscale? FLUX can generate my target resolution natively from the first pass.... and with very little detriment to composition.
Now I'm generating directly at ~1600px+. Quality and composition don't suffer at all, and outputs are incredibly clear and detailed (I'm a stickler for fine detail). Then it only needs a pass with a GAN to reach 4k+.
Not only is it saving time over my old workflows, but looks even better as well. It also takes no more vram than 1024px (dont ask me how). Only downside being that you need to wait a lot longer for generation previews to show up before you can decide if you want to cancel and do another.
I can't post comparisons since changing size completely changes the image. But it takes no effort to try it real quick if you are struggling to get high res. Hope this helps someone!