Image-to-Image (often shortened to img2img) starts the diffusion process from an existing image instead of pure noise. The model preserves the rough composition and colors of the input but applies the text prompt to transform style, subject, or details. Useful for converting a photo into a painting, refining a sketch into a finished illustration, or generating consistent variations of a starting image. Every major model supports some form of img2img; the implementations and strength sliders differ.