# Skill: effect/halation-bloom — "הילה ובלום" (Halation / bloom)

Highlights glow — a red film halation round bright edges, or a soft dreamy bloom.
האזורים הבהירים זוהרים — הילה אדומה של פילם סביב קצוות בהירים, או בלום חלומי ורך.

Category: Looks & grades · לוקים וצבע · a real preview: https://media.gpt.org.il/lookbook/effects/halation-bloom.mp4?v=mv19exzc
Price: **60 credits per finished minute**: the render itself — 1 credit per second of 1080p output, **+ 120 a minute for the time the effect is on screen** — a heavy effect: it adds 2× a plain render second per second (measured). Combined with captions, a hook or other effects: still one render, nothing more for combining.

Base URL: `https://apihub.co.il` · Auth: `Authorization: Bearer <API key>` · Docs: `/docs` (group "Video Effects")
Send `X-Tag: <job name>` on every call of one video; `GET /v1/usage?tag=<job name>` returns what it cost.
**Files are kept 24 hours** — download the finished video.

---

## 1. On its own — one call

```jsonc
POST /v1/effects/halation-bloom             // x-wait-ms: 110000
{
  "video_url": "https://media.gpt.org.il/samples/sample-he.mp4",
  "params": {
    "mode": "bloom",
    "strength": 1,
    "threshold": 0.62,
    "radius": 50
  }
}
```

A normal render: `status: processing` → poll `GET /v1/executions/{id}` until `completed`, then read `output.url`.

When it plays: the whole video, or a stretch: `start` + `duration`, `at` + `duration`, or `during`.

## 2. With captions, a hook and other effects — the same render

```jsonc
POST /v1/studio/edit               // x-wait-ms: 110000
{
  "video_url": "<the video>",
  "language_code": "he",
  "captions": {
    "style": "classic"
  },
  "effects": [
    {
      "id": "halation-bloom",
      "params": {
        "mode": "bloom",
        "strength": 1,
        "threshold": 0.62,
        "radius": 50
      }
    }
  ],
  "audio": {
    "normalize": true
  },
  "output": {
    "aspect_ratio": "9:16",
    "resolution": "1080",
    "fit": "crop",
    "quality": "high"
  }
}
```

`effects` is a list: add more entries for more effects. The engine applies them by pipeline stage (cuts and time →
camera → grade and looks → overlays → text and captions → sound), never by their order in the list. An edit has one
`transition`, one `color` grade, one `music` bed, one `speed` and one caption style: two effects that set the same
one are refused with a message that names them.

## 3. Params

| param | default | range / options | what it does |
|---|---|---|---|
| `mode` | `"halation"` | `halation` · `bloom` | halation = a red film glow · bloom = a white soft glow |
| `threshold` | `0.75` | 0.4–0.98 | Only what is brighter than this glows |
| `radius` | `22` | 2–80 | How far the glow spreads, px at 1080 wide |
| `strength` | `0.6` | 0–1 | How strong the glow is |
| `tint` | `"#FF4A1C"` | string | halation: the glow's colour |

GET `/v1/effects/halation-bloom` returns the same as JSON (with the full body schema). Every field has a default; numbers
outside their range are refused with the field's name.