image-tryon

Use this skill for all virtual try-on requests on Starchild.

Covers: clothing try-on, accessory try-on, hairstyle preview, makeup preview, glasses try-on, hat try-on, shoes try-on, watch try-on.

Core principle: call the provided script. Do not re-implement proxy/billing plumbing.

Key difference from image-edit: try-on always requires two images — a person photo and a garment/item photo.

---

1. Quick start — clothing try-on (most common)

⚠️ Execution context — read this first. The code blocks below are Python, not shell commands. Starchild's bash tool runs /bin/bash -c, which cannot parse exec(open(...)) — pasting them directly into a bash command will fail with syntax error near unexpected token 'open'. Also, exec(open(...)) inside python3 -c fails with NameError: __file__ because the script uses __file__ for path resolution.

Use python3 - <<'EOF' with from exports import when calling via the bash tool:

python3 - <<'EOF'
import sys
sys.path.insert(0, "skills/image-tryon")
from exports import try_on
result = try_on(
    person_path="uploads/person.jpg",
    garment_path="uploads/dress.jpg",
    category="clothing",
)
print(result)
EOF

The heredoc (<<'EOF') preserves all quotes and newlines — no escaping needed.

exec(open('skills/image-tryon/try_on.py').read())
result = try_on(
    person_path="uploads/person.jpg",
    garment_path="uploads/dress.jpg",
    category="clothing",
)
# result -> {"success": True, "images": [{"local_path": "output/images/..."}], ...}

The script reads both local files, base64-encodes them, and sends them to fal.ai as data URIs — no manual URL publishing needed.

2. Quick start — URL inputs

exec(open('skills/image-tryon/try_on.py').read())
result = try_on(
    person_url="https://example.com/person.jpg",
    garment_url="https://example.com/jacket.jpg",
    category="clothing",
)

3. Quick start — glasses try-on

exec(open('skills/image-tryon/try_on.py').read())
result = try_on(
    person_path="uploads/face.jpg",
    garment_path="uploads/sunglasses.jpg",
    category="glasses",
)

Delivering the result to the user — IMPORTANT

Never hand the user the raw fal.media URL. fal serves files with restrictive CSP headers. The only reliable delivery path is the already-downloaded local file:

1. Use each image's local_path (e.g. output/images/xxx.png) — the script always downloads on success.
2. Tell the user the files are saved to output/images/ and viewable in the workspace file panel.
3. On Web channel, embed inline so the user can preview in chat:

   ![try-on result](output/images/<filename>.png)
   

4. On Telegram / WeChat: send via send_to_telegram(file_path="output/images/...", message_type="image") or send_to_wechat(file_path="output/images/...", message_type="image").

---

4. Parameters

Parameter	Required	Default	Description
person_path	yes*	—	Local workspace file path to the person's photo
person_url	yes*	—	Public HTTPS URL of the person's photo
garment_path	yes*	—	Local workspace file path to the garment/item photo
garment_url	yes*	—	Public HTTPS URL of the garment/item photo
category	no	"clothing"	Try-on category key (see §5)
prompt	no	None	Custom prompt — overrides category default when set
model	no	"nanopro"	Model: "nanopro" (fast ~25s) or "gpt" (best quality ~150s)
aspect_ratio	no	"3:4"	Output ratio: 1:1, 3:4, 4:3, 9:16, 16:9

Image input rules:

• Person image: provide person_path OR person_url (one is required).
• Garment/item image: provide garment_path OR garment_url (one is required).
• If both path and URL are given for the same image, path takes priority.
• Both images are required — try-on cannot work with only one image.

Prompt priority: prompt (full override) > category default prompt.

---

5. Try-on categories

Intent recognition — what the user says → which category to use

User says	Category	Key
"try on this dress/shirt/jacket/outfit"	Clothing	clothing
"put this necklace/scarf/bag on me"	Accessory	accessory
"show me with this hairstyle/hair color"	Hairstyle	hairstyle
"apply this makeup/lipstick look"	Makeup	makeup
"try on these glasses/sunglasses"	Glasses	glasses
"put this hat/cap/beanie on me"	Hat	hat
"try on these shoes/sneakers/boots"	Shoes	shoes
"put this watch on my wrist"	Watch	watch

Category details

Category	Key	Best for	Photo requirements
Clothing	clothing	Shirts, dresses, jackets, pants, coats, full outfits	Full body or upper body person photo
Accessory	accessory	Scarves, bags, belts, jewelry, necklaces, earrings	Relevant body area visible
Hairstyle	hairstyle	Haircuts, hair colors, styling changes	Clear face/head photo
Makeup	makeup	Lipstick, eyeshadow, foundation, blush, full looks	Clear face close-up
Glasses	glasses	Prescription glasses, sunglasses, reading glasses	Clear face photo, front-facing
Hat	hat	Caps, beanies, fedoras, sun hats, helmets	Head and shoulders visible
Shoes	shoes	Sneakers, heels, boots, sandals, loafers	Full body or lower body photo
Watch	watch	Analog, smartwatches, luxury watches	Wrist/arm visible

---

6. Model selection guide

Model	Key	Speed	Quality	Best for
NanoPro	nanopro	~25s	Good	Default for all requests. Fast iteration.
GPT Image 2	gpt	~150s	Best	When user explicitly asks for "highest quality" or "best quality".

Decision rules:

1. Default: always use nanopro unless the user explicitly requests higher quality.
2. Use gpt when: user says "highest quality", "best quality", "premium", or the result needs to be photorealistic for professional use.
3. Use nanopro when: user wants fast results, is trying multiple items, or iterating on looks.

# Default (fast)
result = try_on(person_path="me.jpg", garment_path="dress.jpg", category="clothing")

# High quality (user requested)
result = try_on(person_path="me.jpg", garment_path="dress.jpg", category="clothing", model="gpt")

---

7. Usage examples by category

Clothing try-on

exec(open('skills/image-tryon/try_on.py').read())
result = try_on(
    person_path="uploads/person_fullbody.jpg",
    garment_path="uploads/summer_dress.jpg",
    category="clothing",
)

Accessory try-on

exec(open('skills/image-tryon/try_on.py').read())
result = try_on(
    person_path="uploads/portrait.jpg",
    garment_path="uploads/gold_necklace.jpg",
    category="accessory",
)

Hairstyle preview

exec(open('skills/image-tryon/try_on.py').read())
result = try_on(
    person_path="uploads/face.jpg",
    garment_path="uploads/bob_hairstyle.jpg",
    category="hairstyle",
)

Makeup preview

exec(open('skills/image-tryon/try_on.py').read())
result = try_on(
    person_path="uploads/face_closeup.jpg",
    garment_path="uploads/evening_makeup.jpg",
    category="makeup",
)

Glasses try-on

exec(open('skills/image-tryon/try_on.py').read())
result = try_on(
    person_path="uploads/face_front.jpg",
    garment_path="uploads/aviator_sunglasses.jpg",
    category="glasses",
)

Hat try-on

exec(open('skills/image-tryon/try_on.py').read())
result = try_on(
    person_path="uploads/head_shoulders.jpg",
    garment_path="uploads/fedora_hat.jpg",
    category="hat",
)

Shoes try-on

exec(open('skills/image-tryon/try_on.py').read())
result = try_on(
    person_path="uploads/person_fullbody.jpg",
    garment_path="uploads/white_sneakers.jpg",
    category="shoes",
)

Watch try-on

exec(open('skills/image-tryon/try_on.py').read())
result = try_on(
    person_path="uploads/wrist_photo.jpg",
    garment_path="uploads/luxury_watch.jpg",
    category="watch",
)

Custom prompt (override default)

exec(open('skills/image-tryon/try_on.py').read())
result = try_on(
    person_path="uploads/person.jpg",
    garment_path="uploads/vintage_jacket.jpg",
    category="clothing",
    prompt="The person is wearing the vintage leather jacket from the second image, styled with a casual street fashion look. Keep the person's face and body exactly the same. Add realistic leather texture and natural draping.",
)

Different aspect ratio

exec(open('skills/image-tryon/try_on.py').read())
result = try_on(
    person_path="uploads/person.jpg",
    garment_path="uploads/outfit.jpg",
    category="clothing",
    aspect_ratio="9:16",  # Full-length portrait
)

---

8. Photo requirements — best practices

Person photo guidelines

Category	Recommended photo type	Tips
Clothing	Full body, front-facing	Arms slightly away from body, neutral pose
Accessory	Relevant body area visible	Good lighting on the area where accessory goes
Hairstyle	Clear head/face, front or 3/4 view	Hair pulled back or current style clearly visible
Makeup	Face close-up, front-facing	Clean face, good even lighting, no heavy makeup
Glasses	Face front-facing, eyes visible	No existing glasses, clear eye area
Hat	Head and shoulders, front-facing	No existing hat, hair visible
Shoes	Full body or legs/feet visible	Standing pose, current shoes visible
Watch	Wrist/forearm visible	Bare wrist or current watch visible

General photo quality rules

1. Lighting: well-lit, even lighting works best. Avoid harsh shadows on the face/body.
2. Resolution: 1024×1024 or higher recommended. Low-res photos produce poor results.
3. Angle: front-facing photos work best for most categories.
4. Background: any background works, but clean backgrounds produce cleaner results.
5. Pose: natural, relaxed poses. Avoid extreme angles or heavy cropping.

Garment/item photo guidelines

1. Product shots work best: official product images on white/neutral backgrounds.
2. Clear visibility: the item should be the main focus, not obscured.
3. Multiple angles: front view is most important for clothing.
4. Color accuracy: ensure the photo shows true colors (no heavy filters).
5. High resolution: detailed product images produce better try-on results.

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9. Prompt engineering for custom try-on

When the default category prompt doesn't produce the desired result, use a custom prompt. Follow these guidelines:

The 5-element try-on prompt structure

[person preservation] + [item description] + [fit/positioning] + [style/mood] + [quality anchors]

Key principles

1. Always preserve identity: "Keep the person's face, body shape, and pose exactly the same."
2. Describe the item clearly: "wearing the red leather jacket from the second image"
3. Specify fit and positioning: "natural draping, proper shoulder fit, realistic wrinkles"
4. Add style context: "casual street style look", "formal business attire"
5. Quality anchors: "professional fashion photography", "editorial quality", "realistic shadows"

Example custom prompts

Formal outfit:

The person is wearing the navy blue suit from the second image. Keep the person's face, body, and pose exactly the same. The suit should fit perfectly with proper tailoring — clean shoulder line, correct sleeve length, natural lapel lay. Professional fashion photography quality with studio lighting.

Casual street style:

The person is wearing the oversized hoodie from the second image in a relaxed street style. Keep the person's identity and pose the same. The hoodie should drape naturally with realistic fabric weight and casual fit. Urban photography style.

Jewelry combination:

The person is wearing the diamond pendant necklace from the second image. Keep everything about the person the same. The necklace should sit naturally on the collarbone with realistic sparkle and light reflections. The chain length and pendant size should be proportional to the person's frame.

---

10. Error handling

Error	Cause	Solution
"Person image error: Either person_path or person_url must be provided"	Missing person photo	Ask user for their photo
"Garment/item image error: Either garment_path or garment_url must be provided"	Missing item photo	Ask user for the item photo
"File not found"	Invalid file path	Check the file path and try again
"Unsupported image format"	Non-image file	Use JPG, PNG, or WebP
"Image too large"	File > 10 MB	Resize or compress the image
"Unknown category"	Invalid category key	Use one of the 8 valid categories
Low quality result	Poor input photos	Use higher resolution, well-lit photos
Wrong item placement	Unclear body positioning	Use front-facing photos with target area visible

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11. When NOT to use this skill

• Single image editing (no garment/item reference) → use image-edit skill
• Portrait generation (styled photos from one reference) → use image-portrait skill
• Text-to-image (no reference photos at all) → use image-create skill
• Fashion model generation (creating models from scratch) → use image-create skill