参照画像活用

from google import genai
from google.genai import types
from PIL import Image
import io
import os
from dotenv import load_dotenv

load_dotenv()
client = genai.Client(api_key=os.getenv("GOOGLE_API_KEY"))

def generate_with_reference(prompt, reference_images, filename="output.png", aspect_ratio="1:1"):
    """参照画像を使用して画像を生成

    Args:
        prompt: プロンプト文字列
        reference_images: PIL Imageオブジェクトまたはファイルパスのリスト
        filename: 出力ファイル名
        aspect_ratio: アスペクト比
    """
    # 参照画像を読み込み
    images = []
    for ref in reference_images:
        if isinstance(ref, str):
            images.append(Image.open(ref))
        else:
            images.append(ref)

    # contentsを構築（プロンプト + 画像）
    contents = [prompt] + images

    response = client.models.generate_content(
        model="gemini-2.5-flash-image",
        contents=contents,
        config=types.GenerateContentConfig(
            response_modalities=['IMAGE'],
            image_config=types.ImageConfig(aspect_ratio=aspect_ratio)
        )
    )

    for part in response.candidates[0].content.parts:
        if hasattr(part, 'inline_data'):
            image = Image.open(io.BytesIO(part.inline_data.data))
            image.save(filename)
            print(f"画像を保存しました: {filename}")
            return image
    return None

Use Image A for the character's identity,
Image B for the art style,
and Image C for the background environment.

Keep the character from Image 1 but put them in the pose from Image 2.
Apply the color palette from Image 3.

Use the uploaded images as follows:
- Image 1: Subject reference (maintain character identity)
- Image 2: Style reference (apply artistic style)
- Image 3: Background reference (use this environment)

Create a new image with the following specifications:
- Use the character from Image 1 (maintain exact facial features, clothing, and proportions)
- Place them in the environment shown in Image 2
- The character should be [POSITION]
- Maintain the exact lighting and atmosphere from Image 2
- Character scale should match the environment naturally

Place the person from Image 1 into the office environment shown in Image 2.

Specifications:
- Position: Standing confidently near the window
- Maintain exact facial features, hairstyle, and skin tone from Image 1
- Adjust clothing to match professional context if needed
- Match the warm afternoon lighting from Image 2
- Natural shadow placement consistent with light source
- Scale the character appropriately for the room

The result should look like a natural photograph taken in this office.

Place the character from Image 1 into the mystical forest from Image 2.

Specifications:
- Character is walking on the forest path, viewed from 3/4 angle
- Retain all character details: armor design, weapon, facial features
- Apply the magical blue-green lighting from Image 2 to the character
- Add subtle fog around the character's feet for depth integration
- Maintain fantasy illustration style consistent with Image 2
- The character should appear to belong in this world

Seamless integration between character and environment.

Position and Scale:
- Character positioned in [HORIZONTAL_POSITION] of the frame
- Character occupies approximately [PERCENTAGE]% of the frame height
- Facing [DIRECTION], looking towards [GAZE_TARGET]
- [FOOT_PLACEMENT]
- [BODY_ANGLE]

Place the character from Image 1 into Image 2.

Position and Scale:
- Character positioned in the right third of the frame
- Character occupies approximately 60% of the frame height
- Facing left, looking towards the center of the image
- Feet touching the ground naturally
- Slight 3/4 turn towards the viewer

Environment Integration:
- Match the lighting direction from the background (light from upper left)
- Apply appropriate shadows on the ground
- Adjust color temperature to match the scene

[Upload: original.png, style_reference.png]

Transform Image 1 using the artistic style from Image 2.
- Maintain the exact composition and subject from Image 1
- Apply the color palette, brushwork, and texture from Image 2
- Keep facial features recognizable if a person is present

Transform the photo (Image 1) into the painting style shown in Image 2.

Style Transfer Specifications:
- Preserve the scene composition and lighting direction from Image 1
- Apply the thick, expressive brushstrokes from Image 2
- Use the swirling, dynamic patterns characteristic of the style
- Adopt the vibrant color palette (especially blues and yellows)
- Maintain recognizable facial features if a person is present
- Add visible paint texture and impasto effects

The result should feel like an original oil painting, not a filter.

Transform this selfie (Image 1) into Japanese anime style matching Image 2.

Style Transfer Specifications:
- Keep my exact facial structure, hairstyle, and expression
- Apply the cel-shading and bold outlines from Image 2
- Use the color palette and lighting style from Image 2
- Large expressive eyes while maintaining face recognition
- Clean, professional anime illustration quality
- Smooth skin with anime-style shading
- Simplified but recognizable features

The result should look like official anime character art.

Transform Image 1 into a delicate watercolor painting style.
- Soft, translucent washes of color
- Visible paper texture showing through
- Loose, flowing brushwork
- Colors bleeding slightly at edges
- Light, airy feel with white paper highlights

Transform Image 1 into traditional Japanese ukiyo-e woodblock print style.
- Flat areas of color with bold black outlines
- Limited color palette (traditional Japanese colors)
- Stylized waves or patterns in background
- No gradients, only solid colors
- Decorative border elements

Create a new image combining elements from all three reference images:

Image 1 (Subject Reference):
- Use the character's identity (facial features, body type)

Image 2 (Background Reference):
- Use this environment and setting
- Maintain the architecture and spatial layout

Image 3 (Style Reference):
- Apply this artistic style (color palette, brushwork, lighting)

Specifications:
- Character from Image 1 standing in the center of Image 2's environment
- Apply the artistic style and mood from Image 3
- Seamless integration between all elements
- Consistent lighting derived from Image 3's style

Create a new image with the following specifications:

From Image 1 (Character):
- Use the exact character design and features
- Maintain clothing and accessories

From Image 2 (Environment):
- Use the mystical forest setting
- Keep the composition and depth

From Image 3 (Style):
- Apply the Studio Ghibli-like animation style
- Use the warm, soft color palette
- Apply the characteristic lighting and atmosphere

The character from Image 1 should be walking through the forest from Image 2,
all rendered in the beautiful animation style of Image 3.

Position: Character in center-left, walking into the scene
Expression: Wonder and curiosity

Create a new image using:

Image 1 (Character Identity):
- Use this character's face, hair, and clothing

Image 2 (Pose Reference):
- Match this exact pose and body position
- Copy the arm positions and hand gestures
- Maintain the camera angle

Keep the character from Image 1 but pose them exactly like Image 2.
Match the dynamic energy and movement from the pose reference.

Retain facial identity, eye color, hairstyle, and clothing details
from subject_primary.

Character design sheet for Kai, a young adventurer:
Front view, side view, action pose.

- 20 years old male
- Messy brown hair with a single white streak
- Warm amber eyes
- Light tan skin with a small scar on chin
- Wearing a dark green traveling cloak over brown leather armor
- Carrying a worn backpack and a sword at hip

Fantasy RPG style, detailed illustration, white background.

Place the character from Image 1 into a new scene.

Environment: dense magical forest with glowing mushrooms, misty atmosphere

Maintain exact character features from the reference:
- Messy brown hair with white streak
- Amber eyes
- Green cloak and brown leather armor

The character should look like they belong in this environment.
Match lighting to the scene naturally.
Dynamic pose appropriate for the setting.

Render the character from Image 1 in a new artistic style.

Style: soft watercolor painting with visible brush strokes and paper texture

Maintain character identity and recognizable features.
Apply the artistic style thoroughly.

Match the lighting direction and color temperature from the background.
Add appropriate shadows on the ground.
Apply ambient lighting from the environment to the character.

IMPORTANT: Use ONLY the character from Image 1.
IMPORTANT: Use ONLY the background from Image 2.
IMPORTANT: Use ONLY the style from Image 3.
Do not mix elements between these roles.

Scale the character to occupy approximately 40% of the frame height.
Position so feet are touching the ground naturally.
Match the perspective and vanishing point of the background.