How do I outpaint a still with FLUX Fill or SDXL inpainting in diffusers (strength, mask blur, resolution) and which licences apply?

Problem. Extending a frame beyond its edges while keeping the original pixels. Conditions. diffusers FluxFillPipeline or an SDXL inpainting checkpoint. Method. (1) FLUX.1 Fill [dev]: the docs say the pipeline supports inpainting and outpainting and does not take a strength input; pass prompt, image, mask_image, height, width and max_sequence_length=512; the BFL doc says the mask must be a black-and-white image the same size as the conditioning image. For outpainting (inference): paste the source on a larger canvas, make the mask white over the new area, and set height/width to the canvas size. (2) SDXL Inpainting 0.1: guidance_scale 8.0, 15-30 steps, and strength=0.99 - the card says to keep strength below 1.0; checkpoint is openrail++. (3) General inpaint tuning from the diffusers guide: strength is how much noise is added to the base image, higher gives more difference from the original; blur_factor on the mask processor softens the seam (example 33); padding_mask_crop crops around the mask, upscales for inpainting and overlays back, improving quality. Failure modes. Hard seams where mask edges are sharp; high strength changes the kept region (inference: so composite the original pixels back over the unmasked area). Limitations. Docs show inpainting examples; outpainting canvas construction is not documented as a recipe. Rights. FLUX.1 Fill [dev] uses the FLUX.1-dev Non-Commercial License and is a gated Hugging Face repo; SDXL Inpainting 0.1 is openrail++. Version/date. diffusers main and BFL docs fetched 2026-10-23. Curator qualifications: All cited documentation excerpts located on the live pages by curator GET; no video sources. Limitations: Outpaint canvas recipe is my inference from inpainting inputs; no source demonstrates an outpaint example in these pages. Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

{
  "citations": [
    {
      "url": "https://raw.githubusercontent.com/huggingface/diffusers/main/docs/source/en/api/pipelines/flux.md",
      "note": "Fill Inpainting/Outpainting; Fill Inpainting/Outpainting; Fill code; Open-weights usage; Open-weight models; How to use; Strength; Mask blur; padding_mask_crop; outpaint recipe"
    },
    {
      "url": "https://raw.githubusercontent.com/black-forest-labs/flux/main/docs/fill.md",
      "note": "Fill Inpainting/Outpainting; Fill Inpainting/Outpainting; Fill code; Open-weights usage; Open-weight models; How to use; Strength; Mask blur; padding_mask_crop; outpaint recipe"
    },
    {
      "url": "https://huggingface.co/diffusers/stable-diffusion-xl-1.0-inpainting-0.1/raw/main/README.md",
      "note": "Fill Inpainting/Outpainting; Fill Inpainting/Outpainting; Fill code; Open-weights usage; Open-weight models; How to use; Strength; Mask blur; padding_mask_crop; outpaint recipe"
    },
    {
      "url": "https://raw.githubusercontent.com/huggingface/diffusers/main/docs/source/en/using-diffusers/inpaint.md",
      "note": "Fill Inpainting/Outpainting; Fill Inpainting/Outpainting; Fill code; Open-weights usage; Open-weight models; How to use; Strength; Mask blur; padding_mask_crop; outpaint recipe"
    }
  ]
}