**Cost**: 13 credits per successful call.

Image Layering supports two input modes:

1. **JSON URL mode**: send `application/json` with the existing URL field.
2. **Direct upload mode**: send `multipart/form-data` with a local image file in the `image` field. The compatible field name `file` is also accepted for the primary image. Codia checks credits before reading and uploading the file, so insufficient-credit requests return `402` without uploading anything.

Direct upload example:

```bash
curl 'https://openapi.codia.ai/v2/open/image/layering' \
  -H 'Authorization: Bearer {codia_api_key}' \
  -F 'image=@./image.png'
```

Decompose a single image into an **ordered stack of editable layers** — background, subject(s), and overlays — each rendered separately. The output is a JSON DSL describing the layer tree plus the per-layer image data. Use this when you want a designer-style PSD-equivalent, not a single flat composition.

## What this API is for

Turning a flat marketing image back into editable components; pre-processing for downstream compositing; setting up animated reveals where each layer animates separately; segmenting photo content for fine-grained editing.

Different from `image_to_design`: that one returns a structural design-tree (Body / Layer / Text / Image nodes with positions and styles). `image_layering` returns visual layers (independent rendered images that you can stack). They complement each other.

## Request

| Field | Required | Notes |
|---|---|---|
| `image_url` | yes | Public URL of the image to decompose. |

No `model` parameter — uses Codia's layering pipeline.

## Response

Unique to this endpoint:

| Field | Type | Meaning |
|---|---|---|
| `data.type` | integer | Result-type code. Identifies the schema variant of `dsl`. |
| `data.dsl` | string | **JSON-encoded** layer tree. Parse client-side. Contains layer metadata + URLs to the rendered layer images. |

```json
{ "code": 0, "message": "ok", "data": { "type": 1, "dsl": "{\"layers\":[…]}" } }
```

The `dsl` field is intentionally a string (not a nested object) so you can store it verbatim or stream it without re-encoding.

## Billing & limits

- 13 credits per request from the unified Codia Open API balance.
- Synchronous.

## Errors

Standard set.

> **Sync vs. async**
> This synchronous endpoint returns the result inline — the simplest path. For production pipelines that need webhook delivery, automatic retry with idempotency, or explicit task cancellation, call `POST /v2/open/tasks` with `operation=image_layering` instead. Inputs and credit cost are identical.

選填，由使用者自訂的冪等鍵（最多 255 個字元）。設定後，成功（2xx）的回應會快取 7 天。以相同的鍵 + 相同的請求主體重試時，會回傳快取的回應（不另外扣除點數）；以相同的鍵但不同的請求主體重試，則回傳 409。可讓 POST 請求在網路故障時安全重試。對於 multipart/form-data 上傳，請求會依表單欄位與檔案內容比對，因此即使用戶端產生新的 multipart boundary，重試的上傳仍會重播先前的結果。

Idempotency-Key

image_url

image

相容用的來源圖片檔案欄位（已棄用：請改用 `image`）。

file

未上傳圖片時使用的來源圖片 URL

code

message

type

data

請求主體格式錯誤或缺少必要參數

Idempotency-Key 已被用於不同的請求主體。

已達速率限制。請等待 `Retry-After` 標頭中指定的秒數後再重試。

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將扁平圖片拆解為有序的圖層堆疊（背景、主體、文字與疊加元素），各圖層可分別編輯。

影像分層

輸入

輸出

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