Which controlnet is used in reference-only

[Gynjn]

When I use a reference image in a reference-only method with controlnet, which controlnet is exactly used?
I didn't downloaded any controlnet model, just get extension from git.
Thanks

[Sisimshow]

No actual model is used. You select one of the Reference Only preprocessors and give it an image. You do not select any model.

[Gynjn]

Thanks for reply, BTW one more thing. Then the control weight parameter is the weight multiplier in reference image attention?