qwen-edit

Qwen-Image-Edit Skill

AI-powered image editing via tools/image_edit.py. The model depends on the deployment:

The tool prints Model: and Steps: after each edit, so you can tell which model the Modal app runs and how many steps it took. Without --steps, each model runs its own default above. Opt in with IMAGE_EDIT_MODEL=qwen-image-2.1 uv run modal deploy docker/modal-image-edit/app.py; deploy again without it to switch back.

Status: Evolving - learnings being captured as we experiment. The prompt patterns and parameter findings in examples.md / parameters.md were measured on 2511; re-check them on 2.1 before relying on the exact numbers.

Qwen-Image-2.1 specifics (Modal opt-in)

• Not step-distilled -- 40 steps is the model card default. The old 8-step

default was tuned for 2511's Lightning LoRA, which 2.1 doesn't have here, so expect low step counts to cost quality (untested).

• Sampled without guidance. --guidance 1.0 (default) is how the model is meant

to run. >1 switches on true CFG (blank negative prompt if you pass none) and doubles the cost of every step.

• Multi-image: the first --input is the image being edited ("image 1"); the

rest are references in order ("image 2", ...). Up to 10. Output size follows the first image's aspect ratio at ~1MP.

• Local edits: draw a circle or paint an annotation on the image, or pass a

separate mask as an extra --input, and say what to change there (e.g. "Remove the watch inside the red circle").

• RGBA: transparent PNG inputs keep their alpha. For a cut-out, prompt

"This is an RGBA image with transparency. <subject>. The image has alpha channel and the background is transparent." -- the result comes back as an RGBA PNG only when the model actually produced transparency.

When to Use This Skill

Use when the user wants to:

• Edit/transform photos while preserving identity
• Reframe cropped images (fix cut-off heads, etc.)
• Change clothing, add accessories
• Change pose (arm positions, hand placement)
• Apply style transfers (cyberpunk, anime, oil painting)
• Adjust lighting/color grading
• Add/remove objects
• Character transformations (Bond, Neo, etc.)

When NOT to Use

• Background replacement (single image) - creates cut-out artifacts, halos
• Face swapping - cannot preserve identity from reference
• Outpainting - can't extend canvas reliably

Use With Care

• Multi-image compositing - CAN work with explicit identity anchors (see examples.md for prompt patterns). Requires describing distinctive features (hair texture/color, ethnicity, outfit) and using guidance ~2.0
• Camera angle changes - Inconsistent results. Vertical angles (low/high) work better than rotational (three-quarter view)

Quick Reference

# Basic edit
uv run tools/image_edit.py --input photo.jpg --prompt "Add sunglasses"

# With negative prompt (recommended)
uv run tools/image_edit.py --input photo.jpg \
  --prompt "Reframe as portrait with full head visible" \
  --negative "blur, distortion, artifacts"

# Style transfer
uv run tools/image_edit.py --input photo.jpg --style cyberpunk

# Background (use cautiously - often fails)
uv run tools/image_edit.py --input photo.jpg --background office

# Higher quality (RunPod / 2511 -- on Modal / 2.1 the 40-step default already is)
uv run tools/image_edit.py --input photo.jpg --prompt "..." --steps 16 --guidance 3.0 --cloud runpod

# Extract the subject onto a transparent background (Modal / 2.1)
uv run tools/image_edit.py --input product.jpg   --prompt "This is an RGBA image with transparency. The product from the photo. The image has alpha channel and the background is transparent."   --output product_cutout.png

# Multi-image composite (identity-preserving) -- settings tuned on RunPod / 2511
uv run tools/image_edit.py --input person.jpg background.jpg \
  --prompt "The [ethnicity] [gender] with [hair description] from first image is now in [scene] from second image. Same [features], [outfit]." \
  --negative "different ethnicity, different hair color, different face shape, generic stock photo" \
  --steps 16 --guidance 2.0 --cloud runpod

# Multi-image composite on Modal / 2.1 -- up to 10 references, defaults usually suffice
uv run tools/image_edit.py --input person.jpg outfit.jpg shoes.jpg background.jpg \
  --prompt "The person from image 1 wearing the outfit from image 2 and the shoes from image 3, standing in the scene from image 4. Same face and hair."

Key Files

• prompting.md - Prompt patterns and structure
• examples.md - Good/bad examples from experiments
• parameters.md - Tuning steps, guidance, negative prompts

Tool Location

tools/image_edit.py - CLI wrapper for the Modal (docker/modal-image-edit/) and RunPod (docker/runpod-qwen-edit/) endpoints

Related Docs

• docs/qwen-edit-patterns.md - Character transformation patterns
• .ai_dev/qwen-edit-research.md - Research notes