Change Background API

New scene behind an untouched subject: describe the background, keep the product pixels.

POST/v1/generateworkflow: change_background-v1

One endpoint serves every workflow — this page documents change_background-v1, the current version. Credits are debited at submission (1 cr standard, 3 cr pro); a failed generation is refunded automatically. Earlier versions of this endpoint, if any, keep being served under their own names.

Parameter	Value for this workflow
workflow	"change_background-v1" required
source_image	Image to change — one public HTTPS URL.required
background_image	New background — one public HTTPS URL.
fields.background	New background. The new background in words — From text variant; ignored when you send background_image.
ratio	auto
tier	"standard" (1 cr) or "pro" (3 cr)
webhook_url	Optional — we POST the outcome here when the generation settles. Without it, poll the URL returned in the response until the status settles.

Example request

curl -X POST https://thenewblack.ai/api/v1/generate \
  -H "Authorization: Bearer tnb_live_XXXXXXXXXXXX" \
  -H "Content-Type: application/json" \
  -d '{
    "workflow": "change_background-v1",
    "source_image": "https://example.com/image.jpg",
    "background_image": "https://example.com/background.jpg",
    "fields": {
      "background": ""
    },
    "ratio": "auto",
    "tier": "standard"
  }'

// 202 Accepted
{
  "generation_id": "3f1c9a6e-...",
  "status": "running",
  "poll": "/api/v1/generations/3f1c9a6e-..."
}

Example response

Poll /v1/generations/{id} (or receive the webhook) until the generation settles:

// 200 OK
{
  "generation_id": "3f1c9a6e-...",
  "workflow": "change_background",
  "status": "succeeded",
  "result": {
    "type": "image",
    "url": "https://.../result.webp",
    "thumbnail": "https://.../thumb.webp"
  }
}

Results are stored for 48 hours — copy them to your own storage. Authentication, errors and webhooks are documented in the full API reference.

Frequently asked questions

Does the product change when the background does?

No — the subject is preserved; only the scene around it is regenerated.

How much does it cost?

1 credit on the standard tier, 3 on pro. Credits come with plans and packs; a failed generation is always refunded.

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