# APNG Lip Sync Tool 개발기 - v6: Gemini Image로 입모양 생성

## 개요

Gemini 2.5 Flash Image (Nano Banana)를 활용하여 원본 이미지에서 다양한 입모양 변형을 생성합니다.

## 핵심 함수

```python
def generate_viseme_image(original_image_path, viseme, viseme_description, output_path):
    """Generate a viseme variation of the original image."""
    prompt = f"""Edit this face image to change ONLY the mouth shape.

Target mouth shape: {viseme} - {viseme_description}

Instructions:
1. Keep the face, eyes, hair, and all other features exactly the same
2. Only modify the mouth/lips area
3. The mouth should show: {viseme_description}
4. Maintain the same art style and quality
5. The transition should look natural"""

    response = client.models.generate_content(
        model=GEMINI_IMAGE_MODEL,
        contents=[prompt, image_part],
        config=types.GenerateContentConfig(
            response_modalities=["IMAGE", "TEXT"]
        )
    )

    # Extract generated image
    for part in response.candidates[0].content.parts:
        if part.inline_data.mime_type.startswith("image/"):
            with open(output_path, "wb") as f:
                f.write(part.inline_data.data)
```

## 일괄 생성

```python
def generate_all_visemes(image_path, character_name):
    """Generate all viseme images for a character."""
    for viseme, description in VISEME_SET.items():
        generate_viseme_image(
            original_image_path=image_path,
            viseme=viseme,
            viseme_description=description,
            output_path=char_dir / f"{viseme}.png"
        )
```

## 결과

원본 이미지 하나로 11개의 입모양 변형 이미지가 생성됩니다.

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*다음: v7 - APNG 생성 로직*