Amazon Premium A+ full background image: ask for 1472x608

Amazon's PremiumFullBackgroundImageModule wants a desktop image of at least 1464 by 600 pixels and a mobile image of at least 600 by 450. On Sume's openai/gpt-image-2.5, custom image_size edges must be multiples of 16, and neither 1464 nor 600 is. Ask for 1472 by 608 for desktop and 960 by 720 for mobile; both are legal and both exceed Amazon's minimums.

Amazon's numbers are from its A+ Premium modules page; Sume's rules are from the image generation docs, read 2026-10-01.

What does the module need?

Amazon describes a full-width background image with optional headline (max 80 characters) and footer text. Recommended uses are a close-up of the product, a customer using it, or a brand logo.

What are Sume's custom size rules?

Both edges must be multiples of 16, maximum edge 3840, aspect ratio at most 3:1, and 655,360 to 8,294,400 pixels in total. Documented for openai/gpt-image-2.5 and openai/gpt-image-2.5-sunburst.

1464 divided by 16 is 91.5 and 600 divided by 16 is 37.5, so the Amazon minimums themselves are not valid custom sizes. Rounding up to the next multiple of 16 gives 1472 and 608. For mobile, 600 by 450 would be only 270,000 pixels, below the 655,360 floor, so use a larger 4:3 size such as 960 by 720.

{
  "model": "openai/gpt-image-2.5",
  "prompt": "Wide lifestyle shot of the product on a kitchen counter, empty space on the right",
  "image_size": "1472x608"
}

Does this work for every Sume image model?

No. The custom-pixel rule is documented for the two ChatGPT Image 2.5 ids. Other models take a normalized tier (512, 1K, 2K, 4K) and ratio, and a model only accepts the values its catalog lists, so read supported_parameters first.

What else should I check?

Keep the headline out of the image, since Amazon renders it as text. Check the delivered width and height against the minimums, and keep a person or logo inside the central part of the frame so a mobile crop does not cut it.