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The resulting image is heavily darkened #2
Description
Hello.
Downloaded, assembled, launched. Specified the path to the safetensors model. Entered a text task. Got the picture. But the picture always turns out (regardless of the request) darkened. The model does not affect the result.
Compiled with VS2022, Windows 10 22H2 (19045.5537).
The result should definitely be lighter.
Activity
IntptrMax commentedon May 3, 2025
Maybe you can use a different vae, or use a different sampler.
Please tell me the model name, vae name and sampler, cfg, steps you have used, I will try it then.
SaymanDotNet commentedon May 3, 2025
model: cyberrealistic_v41BackToBasics.safetensors
from civitai
VAE path is empty.
steps: 30, cfg: 7.0 or 8.0
prompt (from source): realistic, best quality, 4k, 8k, trees, beach, moon, stars, boat,
negative prompt: 2d, 3d, cartoon, paintings
or prompt: car
cat, dog, etc - darkened result
sampler from source.
SaymanDotNet commentedon May 12, 2025
I tried different files with models and different queries, including negative ones. The result is always the same - the picture is very dark. There is a suspicion that somewhere the conversion of 16bit to 32bit is not performed correctly. it's dark from here
IntptrMax commentedon May 12, 2025
Maybe there are some differences between my sampler and the diffusers, It will take some time to fix.
niksalyan commentedon Nov 1, 2025
I think i found the issue
In SDModel.cs
instead of
image = ((image + 0.5) * 255.0f).clamp(0, 255).@byte().cpu();
The right math would be
image = (((image + 1f) / 2f) * 255.0f).clamp(0, 255).@byte().cpu();
IntptrMax commentedon Nov 3, 2025
You are right. Thanks. I have updated the code.
But I think there are still some bugs, it will get some black blocks on the image.