distortion of some sampler

[dtlnor]

IDK if this is the problem of sampler itself or refiner itself or this extension. So I just post what I find here.

For sampler LMS, Heun, DPM++ 2M, DPM++ 2M SDE
with refiner set to 20% (using latest refiner and dev branch webui)
These samplers has distortion in low sampling steps. here is some screenshot

The steps are 5,10,15, 20, 30, 40, 50

• LMS
  without refiner
  
  with refiner
  

• Heun (the 10, 15 step one shows more artifact than the non-refiner one)
  without refiner
  
  with refiner
  

• DPM++ 2M
  without refiner
  
  with refiner
  

• DPM++ 2M SDE
  without refiner
  
  with refiner
  

[wcde]

Do you use some unofficial SDXL checkpoint? In this case, obviously official refiner will work poorly.

[dtlnor]

Do you use some unofficial SDXL checkpoint? In this case, obviously official refiner will work poorly.

I use sd_xl_refiner_1.0_0.9vae.safetensors
and sd_xl_base_1.0_0.9vae.safetensors
which is from official repo

[lisanet]

Which image size do you use?

Small or sizes mostly result in distortions. Your best bet is to use sizes Stability AI uses in their DreamStudio UI: 1014x1024, 896x1152, 832x1216 768x1344, 640x1536

I use mostly Euler or Euler a

[dtlnor]

@lisanet I use 1024*1024.
Euler and Euler working normally. But in my case LMS etc. have some distortion

[wcde]

LMS is broken, you should probably follow progress on this - AUTOMATIC1111/stable-diffusion-webui#12349
As for the DPM, I don’t see any particular problems, perhaps it will be enough to tweak aesthetic score.