3-step protocol · Warm/Cool/Neutral

Skin Undertone TestYellow base or blue base? AI runs the 3-step vein-jewelry-sunlight protocol

Undertone is the foundation of every color diagnosis — it doesn’t change with makeup or hair dye. We turned the three classical observation tests (vein color, jewelry contrast, sunlight skin) into an AI workflow that returns a verdict from three quick photos.

Why this tool

Vein color test

Upload an inner-wrist photo. AI classifies vein hue as blue/purple (cool), green (warm), or blue-green (neutral) with weights.

Jewelry contrast test

Upload one neck shot wearing silver and one wearing gold. AI compares which metal lifts your skin and adds dimension.

Sunlight skin test

Upload an unfiltered natural-light selfie. AI samples cheek/chin/forehead color temperature (K) and synthesises a verdict.

Iris + lip cross-check

Iris color (deep/light brown/green/blue) and bare lip color overlay — 5 signals total inform the verdict.

Confidence score

Every verdict ships with a 0-100 confidence score. Below 70, the AI prompts you to re-shoot, change lighting, or remove makeup.

Recommended metals

After the verdict, get matched accessory metals (gold / rose gold / silver / platinum / steel) with example pieces.

Copy-ready GPT-Image-2 / Nano Banana Pro prompts

Paste into the chatimg.ai generator with a selfie to get a personal color card. Each image spends credits.

Xiaohongshu

Xiaohongshu Personal Image Report card

Complete multi-section card: palette + outfit + hair + glasses + bag

Generate a high-quality PERSONAL IMAGE REPORT card from the uploaded photo. Preserve original facial features — no beautification. Magazine-style layout:
- Top left: 4-photo comparison wearing different shirt colors (Best / Neutral / Avoid)
- Middle: Seasonal verdict (Spring/Summer/Autumn/Winter) + STYLE KEYWORDS + COLOR PROFILE swatches
- Bottom three columns: BEST COLORS (8 swatches), MAKEUP GUIDE (brow/eye/blush/lip thumbnails), OUTFIT STYLE (4 outfit thumbnails)
- Right column: GLASSES / HAIR COLOR / ACCESSORIES / BODY SHAPE GUIDE
- Footer: KEY RECOMMENDATIONS and AVOID (with red ❌ markers)
Off-white canvas, bilingual EN labels, editorial typography.
K-Beauty

Korean 12-color seasonal diagnosis (Seoul studio replica)

Recreates the ₩300,000 Seoul personal-color studio analysis sheet

Generate a Seoul studio-style 12-color personal color diagnosis sheet:
- Top BEFORE/AFTER large image: subject under neutral white light vs flattering shade
- Middle 12-swatch matrix labelled in Korean (Spring-Light/Bright/Clear, Summer-Light/Mute/Soft, Autumn-Mute/Deep/Rich, Winter-Deep/Bright/Clear)
- Mark each ✅ Best / ⚠️ Neutral / ❌ Avoid
- Right-side radar chart: skin value / yellow-blue / chroma / soft-hard
- Footer: 3 lipstick swatches / 2 hair colors / accessory metal
Bilingual KO/EN, clinical-luxe magazine layout.

Run a test now inside chatimg.ai

Upload a selfie or write one prompt. The model maps your season and returns a card.

Welcome to ChatIMG Image Assistant

Upload an image or describe the image you want to generate

Enter your description or instructions here

Type @Sketch and choose Draw, or tap Sketch. The sketch is layout; your text is appearance.

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Templates

Tap a card to fill the prompt — it will not generate yet

Reference Image(Image as Prompt)
Use Case
Output Size
Resolution
Upload Image

Click or drag and drop an image

Supports multiple images — AI will blend them together

Batch processing
iOS

FAQ

How do I tell what undertone I have?

The classic 3-step check: ① inner-wrist veins — green means warm, blue/purple means cool, a mix means neutral; ② jewelry contrast — gold flatters warm, silver flatters cool; ③ bare skin in sunlight — golden cast is warm, pink cast is cool. The three often disagree, which is exactly why our AI weighs all three signals from 3 photos into one consistent verdict.

My veins look both blue and green — now what?

Welcome to "neutral skin" (30%+ of Asian women). You can pull off both warm and cool to a degree. AI marks you as Neutral with a warm/cool lean indicator for shopping.

Can I test with makeup on?

Not recommended. Foundation, primer, and highlighter contaminate the signal. Test bare-faced (or moisturizer only); a sheer lip is OK but avoid saturated lipstick.

I’m Cool — can I still wear warm tones?

Yes — wear "cooled-down warms": cool milk-tea (pinkish ivory), cool caramel (avoid saturated orange-gold), cool wine (avoid brick red). AI gives you 5 cross-season swatches.