
Img2Img takes an existing image as input and transforms it using your prompt — one of SD's most powerful and versatile capabilities.
The key parameter. 0.0 = identical to input. 1.0 = completely ignores input. Sweet spot for transformation: 0.5–0.7. For minor changes: 0.2–0.4.
Reference:
TaskLoco™ — The Sticky Note GOAT