Amazon Brand Story hero image size: 1464x625 desktop, 463x625 mobile

Amazon's BrandStoryImageWithLogoModule requires a desktop image of at least 1464 x 625 pixels and a mobile image of at least 463 x 625. Generate the desktop hero at 1472x640 and the mobile one at 768x1024 through Sume's custom image_size: both edges are multiples of 16 and both stay above the 655,360-pixel floor.

Limits are from Amazon's Brand Story modules page, read 2026-10-01; the size rules are from Sume's Image API docs.

What does the module ask for?

Brand Story appears on the product page under "From the Brand", separate from product-level A+ Content. In this card the title and description are overlaid on the hero image.

Which sizes pass Sume's custom size rules?

For GPT custom sizes the docs require both edges to be multiples of 16, a maximum edge of 3840, an aspect ratio of at most 3:1, and 655,360 to 8,294,400 pixels. Neither Amazon minimum is on that grid, and the mobile minimum (463 x 625 is 289,375 pixels) is also under the floor, so pick the nearest valid canvas.

Why not generate the mobile crop at 480x640?

480x640 has 307,200 pixels, under the 655,360 floor. Generate 768x1024 (3:4) instead; it exceeds both Amazon minimums. If you need an exact pixel size afterwards, resize in your own pipeline: the Image API docs describe exact pixels as a post-step for some models, not something the request guarantees.

curl -X POST https://api.sume.com/v1/images \
  -H "Authorization: Bearer $SUME_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: brand-story-hero-mobile-001" \
  -d '{
    "model": "openai/gpt-image-2.5",
    "prompt": "Brand hero scene, empty calm area on the left for overlaid text",
    "image_size": "768x1024"
  }'

Where does the logo go?

The module name says logo, but the fields listed on the page are the two images and the overlaid text; the page does not list a separate logo image field for this card. Do not paint a logo into a generated picture and expect it to be crisp or correct. Leave room and check the module spec before you build the payload. Sibling cards have their own sizes: see the media asset and four-ASIN cards.