Ideogram 4.5 edits: first reference is the source, 4 more allowed

On Sume, Ideogram 4.5 is ideogram/ideogram-v4.5. Without references it generates from text. With references, the first input_references item is the image that gets edited and up to four more are style or content references, five in total. Put the photo you want changed first, or the wrong image becomes the edit source.

One id, two modes

Sume's docs say the request switches mode by whether you send references. No references runs a text-to-image generation. Any references run an edit. An edit without aspect_ratio keeps the shape of the source image, so you do not need to restate its dimensions.

Order matters

Reference 1 is the source. Reference 2 might be a logo, 3 a colour palette image. In the prompt, name each by position: change the text on image 1 using the logo in image 2. If you swap the order, Sume does not warn you, because it cannot know which photo you meant.

curl -X POST "https://api.sume.com/v1/images" \
  -H "Authorization: Bearer $SUME_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"ideogram/ideogram-v4.5","prompt":"Edit image 1: replace the headline with SUMMER SALE. Use the logo from image 2 in the top left. Change nothing else.","quality":"medium","input_references":[{"type":"image_url","image_url":{"url":"https://media.sume.com/uploads/banner.png"}},{"type":"image_url","image_url":{"url":"https://media.sume.com/uploads/logo.png"}}]}'

What the docs rule out

The Ideogram section of the Image API docs lists only input_references, quality, resolution and aspect_ratio for this model, so do not count on mask_url for a region edit; check the capabilities from GET /v1/images/models before relying on any other parameter. The quality names are Sume's low, medium and high.

Budget

The prices above are list prices and exclude Sume's pricing, so read cost_usd from GET /v1/images/models/ideogram/ideogram-v4.5/endpoints before you plan a run.The Sume docs give one per-quality list price for the model and do not add a per-reference charge.

Edit checklist

Before sending an Ideogram edit:

• Source image first in input_references.
• At most four more references after it.
• Leave aspect_ratio out to keep the source shape.
• Name each image by position in the prompt.