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help, my images are very dark,I have tried many methods, such as replacing ckpt or vae, checking "Settings: Apply color correction to img2img results to match original colors", and reducing resolution. But the image hasn't changed anything.

What are the settings that you're using? I suspect it might be too low of a denoising strength but it would be helpful to see the settings as a whole in order to help

"FirstGen" and "InputFrame".I have tried 0.2~0.9 of Denoise Strength

I usually use 1.0 denoise strength but for most images I'd suggest going with 0.75-1.0, so keep it high. With the black background it also could be more prone to darkening from either the color correction or the loopback (i.e. denoising below 1)

I use a white background,I tried 1.0 denoise strengthstill incorrect. Looks like it's lost color

what are all the settings and prompt you used?

...

Try with either denoising strength at 1 or LoopBackSource as previousFrame, you dont want denoising below 1 with any other value for LoopBackSource. I also find that Euler (not Euler a) seems to perform the best for samplers and trying both with or without color correction may help

I tried as you said, but the result is still not good

what prompt and model are you using? I havent seen an issue like this and I wonder if it's maybe a model that particularly doesnt work well with this or something. The only other issues I could imagine would be prompt-based or some settings in your UI that aren't default.

Same problem here with Automatic1111, I've tried different models, different settings, played with denoise settings, loopback,color correction.... "Allow other script to control this extension" is checked, "Apply color correction to img2img results to match original colors." is checked. I followed the steps in the tutorial, restarted the webui, but nothing seems to fix the problem. With initial denoise strength =1 I get something barely visible, like the example at the beggining of this thread.