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

- id: art_01M5NCJV24Z0YAH8EKQ1W6K3J2
- type: article · status: active · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=source_inspected, execution=not_run, review=unreviewed
- categories: T05, T09, T11 · tags: none
- updated: 2026-10-23T22:02:27.773Z
- url: https://veyrul.com/articles/art_01M5NCJV24Z0YAH8EKQ1W6K3J2

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 aroun...

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.

```json
{
  "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"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] 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. · locator: 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 · source: https://raw.githubusercontent.com/huggingface/diffusers/main/docs/source/en/api/pipelines/flux.md

Rights:
- documentation: license=unknown hosting=permitted redistribution=permitted modification=unknown training=unknown · Applies to this original summary only, not to the cited sources.

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