# In the diffusers-vs-ComfyUI Qwen-Image-Edit thread, did anyone identify a practical cause of the quality gap?

- id: art_01M5NPES9M9CCH39852K3ZWBNE
- 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, T08, T20 · tags: none
- updated: 2026-10-24T00:55:00.654Z
- url: https://veyrul.com/articles/art_01M5NPES9M9CCH39852K3ZWBNE

Problem. C3-B060-G23-07 says several causes were proposed and 'none was confirmed in the thread'. Correction type: (c) missing an important limitation/finding. Method. A contributor (linoytsaban) tested the same script with and without height=1024,width=1024 and reported that omitting them matched ComfyUI quality; a Qwen maintainer (naykun) then advised against custom output height and width and called that likely the main reason. The reporter later disputed that this explains everything, and other hypotheses (RoPE text-frequency base, prompt template, sigma shift) stayed unresolved. Practical rule: for Qwen-Image-Edit in diffusers, let the pipeline compute the output size and keep conditioning images matched to it. Limitations. No maintainer confirmed that the size effect fully closes the gap. Version and date. Thread state as fetched 2026-10-23.

Problem. C3-B060-G23-07 says several causes were proposed and 'none was confirmed in the thread'. Correction type: (c) missing an important limitation/finding. Method. A contributor (linoytsaban) tested the same script with and without height=1024,width=1024 and reported that omitting them matched ComfyUI quality; a Qwen maintainer (naykun) then advised against custom output height and width and called that likely the main reason. The reporter later disputed that this explains everything, and other hypotheses (RoPE text-frequency base, prompt template, sigma shift) stayed unresolved. Practical rule: for Qwen-Image-Edit in diffusers, let the pipeline compute the output size and keep conditioning images matched to it. Limitations. No maintainer confirmed that the size effect fully closes the gap. Version and date. Thread state as fetched 2026-10-23.

Curator qualifications: All cited documentation excerpts located on the live pages by curator GET; no video sources. Correction of earlier record(s) C3-B060-G23-07 from a discovery audit; the curator re-located the cited excerpts by timed GET.

Limitations: Markdown bold markers omitted from excerpts 1 and 2. Issue remains open; later comments contest completeness.

Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

```json
{
  "citations": [
    {
      "url": "https://api.github.com/repos/huggingface/diffusers/issues/12216/comments",
      "note": "comment by linoytsaban, 2025-08-22; comment by naykun, 2025-08-24; same comment"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] Problem. C3-B060-G23-07 says several causes were proposed and 'none was confirmed in the thread'. Correction type: (c) missing an important limitation/finding. Method. A contributor (linoytsaban) tested the same script with and without height=1024,width=1024 and reported that omitting them matched ComfyUI quality; a Qwen maintainer (naykun) then advised against custom output height and width and called that likely the main reason. The reporter later disputed that this explains everything, and other hypotheses (RoPE text-frequency base, prompt template, sigma shift) stayed unresolved. Practical rule: for Qwen-Image-Edit in diffusers, let the pipeline compute the output size and keep conditioning images matched to it. Limitations. No maintainer confirmed that the size effect fully closes the gap. Version and date. Thread state as fetched 2026-10-23. · locator: comment by linoytsaban, 2025-08-22; comment by naykun, 2025-08-24; same comment · source: https://api.github.com/repos/huggingface/diffusers/issues/12216/comments

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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