SD UI - It's impossible to set guidance to 0.

[JohnLoveJoy]

Describe the Issue
Z-Image-turbo says the guidance setting should be 0. But Kobold SD UI doesn't allow setting it to 0; the minimum is 1.

Another thing I noticed is that the resolution doesn't go beyond 1080x1080p, what's the point of that?

[wbruna]

I believe any value between 0 and 1 would be equivalent for Diffusers.

Our stable-diffusion.cpp backend technically accepts CFG values lower than 1 (even negatives!), but that's arguably a bug: they just mess with the model's outputs. This is Z-Image Turbo rendering the prompt "butterfly" with a few different --cfg-scale values:

CFG=0	CFG=0.5	CFG=1

[LostRuins]

Also cfg 0 doesn't make sense, it would mean that the output completely ignores your prompt and would result in random images

[LostRuins]

For the resolution, you can change it in sdui settings to unlock max res.

[wbruna]

I believe any value between 0 and 1 would be equivalent for Diffusers.

Correcting myself: CFG 1 on Koboldcpp (or stabe-diffusion.cpp) would be equivalent to CFG 0 on Diffusers, and that's what the Z-Image Turbo page is referring to.

A CFG 0 on Koboldcpp would be equivalent to CFG -1 on Diffusers, which would disable prompt following (unconditional generation, as I showed above: requesting "any" image from the model, without nudging it in any particular direction).