GPT Image 2.5：プロンプト、画像内の文字、参照画像の使い方

Studio product photograph for a small design brand.
A single matte cobalt-blue insulated water bottle with a brushed stainless-steel
cap stands on a pale limestone block. Three-quarter view, bottle fully visible,
centered in the right half of a wide composition. Warm ivory seamless background,
soft window light from the upper left, a believable contact shadow, fine
powder-coated texture and restrained reflections on the cap. Leave the left
third empty for headline copy added later. No text, no logo, no extra bottles,
no decorative props.

Create a finished editorial poster in a portrait composition.
Warm ivory background. At the top, large crisp dark-navy uppercase typography
reads exactly "MAKE ROOM" on the first line and "FOR QUIET" on the second line.
In the lower right, a sculptural spiral made of matte cobalt-blue ceramic rests
on a simple pale pedestal. Place the small footer "STUDIO NOTES / 01" at the
bottom left. Strong alignment, generous margins, subtle paper texture and one
soft directional shadow. The poster itself fills the image: no frame, no wall,
no mockup perspective. Render only the three specified text elements, with
no additional words, letters, logos or watermarks.

Wide editorial illustration for an article about reusable packaging.
Build the scene as a tactile cut-paper collage: one cobalt-blue water bottle
surrounded by folded cream paper leaves and three simple circular ripples.
Use an off-white handmade-paper background and a restrained sage-green accent.
Show crisp cut edges, slight layering shadows and clean geometric silhouettes.
Keep the bottle and most of the collage in the right two thirds; leave the
left third quiet for a headline added later. The artwork fills the image.
No text, letters, numbers, logos, photographs or watermarks.

Edit the supplied product photograph. Replace only the warm ivory
background with a muted sage-green plaster wall with a very fine matte texture.
Keep the cobalt-blue bottle, its brushed steel cap, the pale limestone block,
the camera angle, crop and product placement unchanged. Preserve the direction
of the light and the contact shadow. Keep the left third empty. Do not add
text, labels, logos, props or another bottle.

curl -X POST https://api.api-stock.com/api/v1/generation/create \
  -H "Authorization: Bearer $API_STOCK_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-image-2.5-flare",
    "input": {
      "prompt": "Studio photograph of a matte cobalt-blue bottle on pale limestone, warm ivory background, soft light from the upper left, room for a headline on the left, no text or logo.",
      "size": "3:2",
      "resolution": "2k"
    }
  }'

curl "https://api.api-stock.com/api/v1/task/status/$TASK_ID" \
  -H "Authorization: Bearer $API_STOCK_KEY"

{
  "model": "gpt-image-2.5-sunburst",
  "input": {
    "prompt": "Replace only the background with a muted sage-green wall. Keep the bottle, cap, block, framing and lighting unchanged.",
    "urls": ["https://example.com/your-approved-product-photo.png"],
    "size": "3:2",
    "resolution": "2k"
  }
}