Unfortunately, Diffusion always mucks with the color palette even when prompted not to.
First, keep in mind that Diffusion is NOT intended to replaceproper rendering applications.
You can turn off Foreground Photo in the Style’s Match Photo settings so that the image from Diffusion doesn’t override the applied textures.
With Foreground on.
With Foreground off.
Don’t forget to update the style.
Agreed. diffusion will not keep colors even prompted to keep colors exactly the same.
This is with SketchUp 2018 as indicated in your profile?
This is with SketchUp 2025
Please update your profile. It’s very out of date.
If you want to show only the materials on the model, turn off the Foreground image in the Match Photo settings in the style. I showed this in my post prior to yours.