Luminar Brush is an advanced image editing tool developed by lllyasviel, the creator of ControlNet. It utilizes a two-stage processing framework: the first stage converts images to uniformly-lit appearances, while the second stage generates illumination effects based on user inputs. This approach simplifies the learning process and avoids complex external constraints. The tool preserves intricate details such as skin textures, hair, and fur, ensuring high-quality results. It's trained with millions of high-quality images, building a robust dataset for the final interactive illumination drawing model, making it ideal for artists, photographers, and visual content creators.