FLUX 3 Image's 15 aspect ratios against what Sume's rows list

BFL's FLUX 3 Image takes 15 fixed ratios plus auto. FLUX 3 Image is not listed in the Sume image catalog (read 2026-10-09). The closest listed row is FLUX.2 Pro, which covers 13 of the 15; the two it misses are 7:5 and 5:7.

What are the 15 ratios?

BFL's prompting guide lists them from 21:9 to 9:21.

How many does each Sume row cover?

Counted against the ratio lists in the Sume catalog code on main, read 2026-10-09:

What does auto do in each?

BFL's auto follows the first reference image and gives 1:1 when there is none. On Sume, aspect_ratio: "auto" on an edit matches the reference, and several rows list auto for text-to-image too. The behavior differs by row, so test one call and read the output size.

What should I do with 7:5 and 5:7?

Neither ratio is in any Sume ratio list, so send a listed value instead. Generate at 3:2 or 4:3 and crop, which loses 6.7 percent of the width from 3:2 or 4.8 percent of the height from 4:3 for 7:5; the crop math for 7:5 and 5:7 is in the next post. Rows and limits are in the image models docs.

A ratio count is not a quality ranking. Nine of the fifteen is enough for most feeds, banners and posters, and the ratios missing from every Sume row are the two photo-print ratios, 7:5 and 5:7. Before choosing a row, list the three ratios you actually publish and check that each one is in the row's catalog entry.

{
  "model": "black-forest-labs/flux.2-pro",
  "prompt": "Product on a wooden table",
  "aspect_ratio": "3:2"
}