stable-diffusion-webui icon indicating copy to clipboard operation
stable-diffusion-webui copied to clipboard

Published 20 hours ago • verified publisher icon AUTOMATIC1111

LMS Karras introduces noise when done

Open guzuligo opened this issue 2 years ago • 7 comments

Describe the bug When using LMS Karras with high sampling number, it produces noise on the image right when it is done, ruining the image it produced.

To Reproduce Try using the following prompt.

banana AND car Steps: 70, Sampler: LMS Karras, CFG scale: 7, Seed: 1745286955, Size: 576x320

guzuligo avatar Oct 08 '22 14:10 guzuligo

Yes, I noticed it yesterday too when testing different samplers (with 50 steps).

HanJammer avatar Oct 08 '22 14:10 HanJammer

The extended sampler settings using Karras in the UI are best approximations of good default parameters. If you'd like to experiment with https://github.com/AUTOMATIC1111/stable-diffusion-webui/wiki/Custom-Scripts#alternate-noise-schedules you may find better parameters.

dfaker avatar Oct 08 '22 17:10 dfaker

I've had the same issue. I was making images with LMS at 20 CFG and 50 steps and having no issues for weeks, but today I make ones at 12 CFG and 60 steps and I'm still getting artifacts. There is definitely something wrong.

Adil3tr avatar Oct 12 '22 01:10 Adil3tr

The extended sampler settings using Karras in the UI are best approximations of good default parameters. If you'd like to experiment with https://github.com/AUTOMATIC1111/stable-diffusion-webui/wiki/Custom-Scripts#alternate-noise-schedules you may find better parameters.

This is a real issue, LMS should not be doing this and didn't until very recently.

Adil3tr avatar Oct 12 '22 16:10 Adil3tr

This is a real issue, LMS should not be doing this and didn't until very recently.

That's an important distinction, I'll try to hunt down some old reference generations.

dfaker avatar Oct 12 '22 17:10 dfaker

I've also had this issue as of late...

aeloi avatar Oct 16 '22 19:10 aeloi

This seems to be happing still, and I have pulled the latest version.

quasiblob avatar Oct 29 '22 17:10 quasiblob

If it's not fixable, they should maybe remove LMS from Automatic, because it has really serious artifacting most of the time right now.

Adil3tr avatar Dec 07 '22 15:12 Adil3tr

Does the issue persist in the current version? Can anyone provide a commit-hash from a version where this worked (plus image generation parameter)? The commit should be recorded in the image's meta data

#2856 looks like there are multiple filed issues around that topic anyhow. #2856 also proposes the solution that Invoke has used for the matter.

TheOnlyHolyMoly avatar Jun 25 '23 16:06 TheOnlyHolyMoly

This is related to k-diffusion specifically. The root issue is the k-diffusion implementation, as ComfyUI has the same issue, so this is not webui related.

Read the comment I have posted there for further info. Closing.

catboxanon avatar Aug 05 '23 02:08 catboxanon