What problem does it solve?
SCAIL-2 character replacement renders in ComfyUI fail in non-obvious ways—oversized characters, leaked driving-subject details, and broken compositing—that each cost a full multi-minute render to discover. This Skill documents the measured pitfalls so you avoid re-renders.
Core Features & Use Cases
- Reference Framing Rule: Explains that in replacement mode the reference image's framing controls the output character's scale, with measured pixel data showing how to pad/reframe references to match the driving subject's size.
- Tuning Trade-off Guidance: Documents how distill LoRA strength and ModelSamplingSD3 shift settings trade color/detail quality against driving-subject detail leakage onto the replacement character.
- Compositing Anti-Pattern: Explains why post-hoc mask compositing to fix color is a regression, since SCAIL-2 resolves color, edges, grip, and occlusion jointly.
- Use Case: You run the official
video_wan21_scail2_character_replacement_int8 template and the swapped character renders 1.7x too large; this Skill tells you to reframe the reference image so the person occupies the same fraction of frame height as the driving subject.
Quick Start
Use the wan-scail-replacement skill to diagnose why my SCAIL-2 character replacement render has the wrong character scale and how to fix the reference image framing.
