Fooocus FreeU
FreeU is another possibility for image variation. FreeU is not really an open university but instead its full title is "FreeU: Free Lunch in Diffusion U-Net". Like the Fooocus Vary function, FreeU operates at the denoising level of Stable Diffusion, as detailed here.
As shown in the image above, there are two pairs of settings for FreeU. Backbone Stages 1 and 2 (B1 and B2) adjust composition and colour while Skip Connections Stages 1 and 2 (S1 and S2) adjust texture and detail. There are no settings that are best for all images, and choosing the best - or using FreeU at all - is often a matter of taste. However, selection is made somewhat easier by a set of eight presets selected from the dropdown menu at the top left of the interface.
The settings for any one of these presets can be adjusted manually with the sliders, but if you wish to return to the default values the Restore Preset Values button at the top right will do so.
Most importantly, ensure that the Enabled checkbox is activated if you wish to use FreeU. The FreeU feature will apply to text-to-image (normal generation mode) as well as to all the Input Image functions.
The first set of test images use the following settings:
- Prompt: a Congolese woman walks away towards a mystic mountain portal on a Dark and Stormy Night. Sharp background, deep depth of field
- Negative Prompt: blurry background
- Styles: Fooocus V2, Fooocus Semi Realistic
- Substyle: Spellcasting Druid
- LoRA: blur_control_xl_v1.safetensors, strength 1
- Preset: Magick
The first image shows the result without using FreeU, then the results for each FreeU preset is shown in alphabetical order:
All of the images satisfied the requirements of the very basic prompt, "a Congolese woman walks away towards a mystic mountain portal on a Dark and Stormy Night", but there were quite different levels of fantasy and detail between the images.
In the non-FreeU image there was just the hint of a castle at the mountain peak. All FreeU images expanded on these theme and even F: Original Fooocus - Subtle .
