商品写真：陶器のコーヒーマグ

同じお題を両モデルで生成。プロンプトの書き方・生成結果・得意分野の違いを並べて検証します。

OpenAI

GPT Image 2

プロンプト

A premium product photograph, 4:5 aspect ratio, centered composition.
Subject:
  - Object: matte ceramic coffee mug, off-white body, natural handle curve, ~11oz capacity
  - Placement: slightly left of center on a weathered oak tabletop
  - State: faint curl of steam rising from the top, mug half full of dark coffee
Lighting:
  - Primary: soft directional window light from right (~45 degrees)
  - Rim: subtle golden rim light on the left edge of the mug
  - Shadow: soft cast shadow under the mug, fading leftward
Background:
  - Solid deep teal backdrop (#1F3A3D), slight radial vignette at corners
Color palette:
  - Mug body: #F1ECE4
  - Coffee: #2A1A0F
  - Rim highlight: #F2C063
  - Background: #1F3A3D
Style: editorial product photography, Kinfolk aesthetic, medium-format look, fine detail, no text overlays.

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Google

Nano Banana

プロンプト

An editorial product photograph of a matte off-white ceramic coffee mug, half-filled with freshly brewed dark coffee, resting slightly left of center on a weathered oak tabletop against a deep teal backdrop. The image is captured with a Fujifilm GFX 100 II medium-format camera and an 80mm lens at f/2.8, framed in a vertical 4:5 composition. Soft morning window light falls from the upper right at a gentle 45 degree angle, creating a quiet chiaroscuro across the scene, while a delicate golden rim light traces the left edge of the mug. A faint curl of steam rises from the dark coffee surface, catching the light mid-air. The color grading emphasizes warm amber highlights on the mug, the rich near-black tones of the coffee, and the muted teal shadows of the background, evoking the restrained editorial stillness of a Kinfolk magazine photograph.

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