A poster approved for its composition is not necessarily a poster ready for a designer to revise. For a Seedream 5.0 Pro workflow through CometAPI, I would separate those acceptance targets before promising editable layers.
The reason is specific to the handoff between two documented surfaces. ByteDance’s Seedream 5.0 Pro product page advertises “layer separation” under Interactive Editing. That section does not specify an API field or layered export format. Meanwhile, CometAPI’s Seedream 5.0 Pro guide gives a first-request example using POST /v1/images/generations, model seedream-5-0-pro-260628, and output_format: "png".
Crucially, the same CometAPI guide warns that point/lasso/layer workflows shown in ByteDance’s product demonstrations may not map one-to-one to every third-party API route. It asks readers to verify the controls exposed by their chosen endpoint.
That is not evidence that CometAPI lacks layer support. Nor is the PNG example an exhaustive list of supported outputs. It means the product demonstration and that example, by themselves, do not establish an editable-layer delivery contract.
Write the acceptance target into the brief
Consider a proposed poster brief with a headline, a central subject, and a decorative background. Two different handoffs could satisfy different needs:
| Intended handoff | Proposed acceptance requirement |
|---|---|
| Raster proof for visual approval | Review the composition as an image. Use the guide’s PNG generation path as the starting point when a raster meets the brief. Do not label this approval as editable-layer acceptance. |
| Asset for independent designer revisions | Require the specified elements to be separately editable in the intended design tool. Decide whether the headline must remain editable text, rather than merely a separate image element. |
“Looks layered” is not the second requirement. The person receiving the file must be able to perform the agreed revisions on the delivered artifact.
Put a delivery check after the CometAPI step
For a layered brief, I would make this a separate acceptance gate:
- Confirm the current route contract. Check the selected Seedream 5.0 Pro endpoint’s documented controls and returned asset structure. Do not invent a layer parameter from the product-page demonstration.
- Inspect what actually comes back. Identify the separately editable elements required by the brief. A preview alone should not close this check.
- Reopen in the receiving design tool. Ask the designer to change the headline, move the subject, and edit the background independently, as required by the brief. Save and reopen the result to check that the intended editability survives the handoff.
- Record the result separately from visual approval. If the required artifact has not been demonstrated, keep the CometAPI generation as a raster proof, budget a design-tool reconstruction step, or leave layered delivery uncommitted.
These are proposed workflow checks, not reported API test results. They prescribe neither a particular export format nor a layer count, and they do not guarantee reconstruction quality or effort.
The practical decision is whether the CometAPI Seedream generation is the final design deliverable or an input to one. ByteDance’s layer-separation positioning makes that distinction worth checking; the CometAPI guide’s own route warning makes it unsafe to settle the question from the demo alone.