GPT Image 2プロンプトガイド：構造、例、スタイル制御

GPT Image 2は、構図、画像内テキスト、参照画像、細かな要件を一つのbriefで扱いたいときにOmniArtで使える、制御性の高い画像モデルです。一度の生成で正確な文字を保証するものではないため、結果の目視確認は必要です。

本ガイドでは再利用できる6部構造と、そのまま使える12のpromptを紹介します。これらは管理されたbenchmarkの結果ではなく、選定した出発点です。貼り付けやすいよう、promptは全言語版で英語のまま掲載します。

OmniArtのGPT Image 2

現在は1K、2K、4K、Low/Medium/High detail、最大9枚の入力画像、再現可能なseedに対応します。モデルは全プランで使えますが、高いdetailと2K以上はStarter以上が必要です。クレジットは解像度とdetailで変わるため、レイアウトは1K Lowで確認します。

6要素のプロンプト構造

「成果物とスタイル + 主体 + 環境 + 光と素材 + 構図と階層 + 正確な制約」の順で書きます。見せる文字を正確に記し、各入力画像に同一性、形状、ポーズ、色、環境のうち1つの役割を与え、seed固定後は1つずつ直します。

有効な6つの習慣

1. 成果物の種類を先に書く。2. 関係は文章で説明する。3. 正確な表示文は引用する。4. 参照ごとに役割を1つにする。5. 小さな修正ではseedを固定する。6. 一度に1つの失敗だけ直す。

Prompt library：そのまま使える12のbrief

1〜12は商品写真、色変更、二言語ポスター、キャラクター三面図、部屋の再設計、料理写真、ファッションビジュアル、インフォグラフィック、ストア画像、YouTubeサムネイル、6コマ絵コンテ、同一性を守る肖像編集です。貼り付けやすいようpromptは全言語で英語のままです。

1

Premium ecommerce packshot of a matte lilac wireless speaker, exact front three-quarter view, centered on a warm ivory seamless background. Soft large-box lighting from upper left, controlled coral rim light, crisp woven fabric and button details, realistic contact shadow. Leave clean space above and below for marketplace cropping. No hands, no props, no logo, no text, no border. Aspect ratio 4:5.

2

Use image 1 as the exact product-geometry reference. Preserve shape, proportions, seams, buttons, camera angle, lighting, background, and shadow. Change only the fabric color from charcoal to soft lilac and the metal controls to brushed warm silver. Do not add or remove any component. Aspect ratio 1:1.

3

Contemporary bilingual event poster on a warm off-white textured background. Large headline at the top reads exactly “FUTURE MADE HUMAN”. Directly below, smaller Chinese text reads exactly “未来，由人创造”. Add the date “18 OCT 2026” and location “SHANGHAI” in a clean information block at the bottom left. One abstract lilac ribbon crosses the center with a single coral accent. Strong grid, generous negative space, sharp legible typography, no extra words, no logo. Aspect ratio 2:3.

4

Professional character turnaround sheet for one original fantasy courier with short silver hair, violet eyes, a dark travel cloak, and a lilac satchel. Show front, left side, back, and three-quarter views of the same character with identical clothing and proportions. Add four facial expressions: neutral, smiling, concerned, determined. Clean warm-white background, organized concept-art grid, small unlabeled color swatches, no prose text. Aspect ratio 16:9.

5

Use image 1 as the exact room-layout reference. Preserve walls, windows, doors, camera position, floor plan, and natural light direction. Redesign the room as a calm contemporary reading studio with warm ivory walls, pale oak shelving, one soft lilac lounge chair, linen curtains, and a single coral ceramic lamp. Remove clutter but do not change the architecture. Photoreal interior photography. Aspect ratio follows image 1.

6

Editorial food photograph of handmade citrus tart on a cream ceramic plate, one slice removed to reveal clean layers. Morning window light from camera right, soft shadows, subtle crumbs, linen napkin, and one sliced blood orange as a supporting prop. Three-quarter overhead composition with restrained styling and natural color. No utensils crossing the tart, no hands, no text. Aspect ratio 4:5.

7

High-fashion campaign image of one model wearing a sculptural plum coat in a minimal warm-violet studio. Full-body pose with the coat silhouette clearly separated from the background. Hard key light from high camera left, soft reflected fill, subtle floor reflection. Leave the upper-right quadrant empty for campaign copy. No logo, no jewelry, no extra people, no text. Aspect ratio 9:16.

8

Clean editorial infographic titled exactly “HOW A FIVE-SECOND CLIP GETS MADE”. Show five numbered stages in a left-to-right flow: “1 BRIEF”, “2 REFERENCES”, “3 GENERATE”, “4 REVIEW”, “5 EDIT”. Use simple geometric icons, a warm ivory background, lilac primary accents, and one coral highlight on stage 4. Strong grid, large readable labels, no paragraph text, no extra stages. Aspect ratio 16:9.

9

App-store feature graphic for a fictional creative app named “MOSAIC”. Center one realistic phone showing a clean image-generation interface. Large headline reads exactly “MAKE THE FIRST FRAME”. Smaller line reads exactly “Image, video, and sound in one brief.” Warm ivory background, soft lilac gradient shapes, one coral call-to-action pill with the text “START CREATING”. Premium product design, no ratings, no store badges, no extra copy. Aspect ratio 16:9.

10

High-contrast YouTube thumbnail showing a split-screen transformation of the same small home office. Left side is cluttered and dim; right side is bright, organized, and warm. One surprised creator is centered across the split with consistent identity. Add only the large text “AI REDESIGNED IT” in the upper left, fully inside safe margins. Bold readable composition, no logo, no arrows, no extra words. Aspect ratio 16:9.

11

Six-frame storyboard for a 10-second product film about a compact wireless speaker. Frame 1: quiet desk at dawn. Frame 2: speaker powers on. Frame 3: close-up of fabric texture. Frame 4: camera circles as music begins. Frame 5: friends enter the room. Frame 6: clean product end frame. Keep the same speaker geometry and room in every panel. Cinematic grayscale storyboard drawing with small frame numbers only, no captions. Aspect ratio 16:9.

12

Use image 1 as the exact identity and facial-geometry reference. Preserve face shape, eyes, nose, mouth, skin tone, age, hairstyle, and expression. Change only the wardrobe to a tailored cream jacket and the background to a softly lit warm-violet studio. Keep the original camera angle and crop. Natural skin texture, realistic fabric, no beauty retouching, no jewelry, no text. Aspect ratio follows image 1.

確認では同一性と形状、正確な文字、視覚階層、参照の境界、使える余白を優先し、変数は1つずつ変更してください。

スタイル制御：効く/効かない

自然言語スタイル指示は keyword spam より良い。3 reliable pattern：

効かない2 pattern：

• 多数スタイル形容詞 stack（「dreamy ethereal cinematic photoreal hyperrealistic」）→ mush に平均化。
• 正確ブランドロゴ要求—— reproduction unreliable； post で composite。

参照画像を使う

最大9枚は役割が明確なときだけ有効です。image 1は商品形状、image 2は構図、image 3は素材や色にできます。編集では変えてはいけない内容を先に列挙してから変更を説明します。

正直な制約

表示文字は一字ずつ校正が必要です。正確なロゴや規制対象の包装文は後で合成します。複数ビューでは同一性、付属品、形状がずれることがあります。高解像度やdetailは曖昧なbriefを直さず、seedもピクセル一致を保証しません。

OmniArtを始める

GPT Image 2を開き、1K Lowと下のpromptを1つ選びます。seedを固定して1変数ずつ変更し、構図、保持項目、文字が安定してからdetailや解像度を上げます。ほかの例はprompt galleryにあります。