gpt-image-1のAPIでジブリ風加工のImage to Imageを試すメモ #JavaScript – Qiita

import fs from "fs";
import OpenAI, { toFile } from "openai";

const client = new OpenAI({apiKey: `APIキー`});

const imageFiles = [
    "kanda-matsuri.png"
];

const images = await Promise.all(
    imageFiles.map(async (file) =>
        await toFile(fs.createReadStream(file), null, {
            type: "image/png",
        })
    ),
);

const rsp = await client.images.edit({
    model: "gpt-image-1",
    image: images,
    prompt: `
 → Transform the input image into a hand-painted Studio Ghibli-style illustration.  
• Use a soft pastel color palette and watercolor-like textures  
• Warm, natural lighting with gentle atmospheric haze  
• Painterly brush strokes, delicate gradients, and subtle film grain  
• Whimsical details: floating petals, glowing fireflies, drifting dust motes  
• Lush, detailed backgrounds (rolling hills, ancient trees, quaint villages, or misty forests)  
• Characters (if present): large expressive eyes, gentle facial expressions, flowing hair/clothes  
• Preserve original composition and silhouette  
• Render at high resolution (e.g. 4K), no text or logos 
    `,
});

// Save the image to a file
const image_base64 = rsp.data[0].b64_json;
const image_bytes = Buffer.from(image_base64, "base64");
fs.writeFileSync("kanda-matsuri-new-1.png", image_bytes);