What denoising strength is best for faces?

Use 0.3-0.4 for faces. This is enough to fix distortion and add detail while keeping the face on-model and consistent with the original. Push toward 0.5 only when features are badly broken, since high denoise can change identity.

Why are hands harder to fix than faces?

Hands need higher denoising (around 0.5-0.6) because fixing finger count and pose requires genuinely regenerating the region, not just refining it. Adding hand-positive prompts and a larger mask dilation helps, and a hand-refiner ControlNet handles the worst cases.

What detection model should I use?

face_yolov8n for faces, hand_yolov8n for hands, and person_yolov8n-seg for full bodies. The 'n' (nano) models are fast and accurate enough for most images; larger variants help only when detection misses.

How does only-masked inpaint size affect quality?

ADetailer crops the detected region and inpaints it at the specified resolution. Setting it to 512 (SD 1.5) or 1024 (SDXL) gives the model a high-res crop of the face or hand, producing much sharper detail than inpainting at the original small region size.

ADetailer Face & Hand Fix Guide

Automatic face and hand fixing with ADetailer

ADetailer is the standard Stable Diffusion extension for cleaning up the two things diffusion models reliably get wrong: faces (especially at a distance) and hands. It detects the region with a YOLO model, then inpaints it automatically after the base generation. The trick is that faces, hands, and full bodies each need different denoising and mask settings — this tool gives you the right configuration for your target and model.

How it works

You choose the fix target and your model type. The tool selects the appropriate detection model, a confidence threshold, and the inpainting parameters: denoising strength, mask blur, mask dilation, and only-masked inpaint resolution. Faces get low denoising to stay on-model; hands get higher denoising because finger geometry must be rebuilt; full bodies use a segmentation model with generous dilation so the re-render blends into the scene.

Tips for reliable fixes

Low denoise for faces, higher for hands. Faces stay recognizable at 0.3-0.4; hands need 0.5+ to actually correct fingers.
Inpaint at native res. Set only-masked size to 512 (SD 1.5) or 1024 (SDXL) so the cropped region is detailed, not soft.
Add a positive prompt in ADetailer. A short “detailed eyes, sharp focus” for faces or “five fingers, natural hand” for hands steers the fix.
Raise dilation to blend. If the fixed region has a visible boundary, increase mask dilation so the inpaint feathers into the surroundings.