[Bug]: img2img makes images darker

[SwayStar123]

Is there an existing issue for this?

• [X] I have searched the existing issues and checked the recent builds/commits

What happened?

Whenever using img2img, the output images always turn out darker (everywhere), but generally only when using a low denoise level. This is especially pronounced when using loopback in img2img, the darkness just compound! to make a very dark image

Input image:

prompt: girl with eyes closed wearing red dress white sleeves negative prompt: nsfw, lowres, bad anatomy, bad hands, text, error, missing fingers, extra digit, fewer digits, cropped, worst quality, low quality, normal quality, jpeg artifacts, signature, watermark, username, blurry,missing fingers,bad hands,missing arms, long neck, Humpbacked,shadow,long body, Abnormal fingers,

sampling steps: 20 width: 512 height: 768 cfg scale: 7 denoising strength: 0.05

img2img loopback, 32 loops, 1 denoising strength change

Output: Final image:

Steps to reproduce the problem

1. Go to img2img
2. Enter input image
3. Set denoising strength to any low amount
4. Setup loopback script with high number of loops
5. Generate image

What should have happened?

The images colors should have remained the mostly the same whilst the shape should have changed

Commit where the problem happens

38b7186e6e3a4dffc93225308b822f0dae43a47d

What platforms do you use to access UI ?

Windows

What browsers do you use to access the UI ?

Google Chrome

Command Line Arguments

No response

Additional information, context and logs

No response

[ClashSAN]

are you turning on the img2img color correction feature?

[SwayStar123]

yes

[zijiren233]

Is vae loaded?

[SwayStar123]

Yes, using anythingv3

[Inkorak]

Same problem.

[williamforty]

I too have this problem, using ProtoGen X5.3

[williamforty]

Just tried with ProtoGen X2.2, and v1.5 pruned emaonly too, and I can see the same darkening behaviour happening.

[DeryabinIvan]

I'm using HentaiDiffusion and Berry's Mix and have the same problem, especially when using inpainting and the loopback script. The image under the mask just gets darker and darker with each iteration, and colour correction doesn't seem to affect this problem. I have also tried using different samplers (Euler a, various DPM++ and DDIM) and the problem still persists.

[Industrepreneur]

Encountered the same

[Letiliel]

Are there people not affected by this?

[whiteblood94]

i just fix this problem need add vae file if u guys dont know vae how to add just google search hope have helping

[Orachigami]

• For Anything v4.5 use https://huggingface.co/andite/anything-v4.0/blob/main/anything-v4.0.vae.pt
• Install to models/VAE in your Stable Diffusion directory
• Go to Settings -> Stable Diffustion and find SD VAE field
• Click Refresh icon on the right side of field
• Select your added VAE
• Click Apply settings

Basically it is really about googling <model name> VAE

[Sonia-kong]

Sorry, I have also met this problem, has it fixed ?