Best Image Generation

# EvoLink Best Image

Generate and edit images via the EvoLink Nano Banana Pro (gemini-3-pro-image-preview) API.

API Endpoint

• Base: `https://api.evolink.ai/v1`
• Submit: `POST /images/generations`
• Poll: `GET /tasks/{id}`

Step 1 — Submit Task

Text-to-image

```json { "model": "gemini-3-pro-image-preview", "prompt": "<USER_PROMPT>", "size": "<SIZE>", "quality": "<QUALITY>" } ```

Image-to-image / editing

```json { "model": "gemini-3-pro-image-preview", "prompt": "<USER_PROMPT>", "size": "<SIZE>", "quality": "<QUALITY>", "image_urls": ["<URL1>", "<URL2>"] } ```

| Parameter | Values | |---|---| | size | auto, 1:1, 2:3, 3:2, 3:4, 4:3, 4:5, 5:4, 9:16, 16:9, 21:9 | | quality | 1K, 2K (default), 4K (extra cost) | | image_urls | up to 10 URLs (each ≤10MB, formats: jpeg/jpg/png/webp) |

Step 2 — Poll for Result

`GET /tasks/{id}` — poll every 10 s, up to 72 retries (~12 min).

Wait until `status` is `completed` or `failed`.

Step 3 — Download & Output

Download the URL from `results[0]`. Auto-detect format from URL (png/jpg/webp). Save as `evolink-<TIMESTAMP>.<ext>`.

• CRITICAL SECURITY: Before passing `<OUTPUT_FILE>` to shell commands, sanitize it:
• Strip all shell metacharacters: `tr -cd 'A-Za-z0-9._-'`
• Ensure valid extension (`.png`, `.jpg`, `.jpeg`, `.webp`)
• Fallback to `evolink-<timestamp>.png` if empty

Print `MEDIA:<absolute_path>` for OC auto-attach.

Reference Implementations

| Platform | File | |---|---| | Python (all platforms, zero deps) | `{baseDir}/references/python.md` | | PowerShell 5.1+ (Windows) | `{baseDir}/references/powershell.md` | | curl + bash (Unix/macOS) | `{baseDir}/references/curl_heredoc.md` |

API Key

• `EVOLINK_API_KEY` env var (required)
• Get key: https://evolink.ai

Triggers

• Chinese: "高质量生图：xxx" / "编辑图片：xxx"
• English: "best image: xxx" / "edit image: xxx"

Treat the text after the colon as `prompt`, use default size `auto` and quality `2K`, generate immediately.

For image-to-image or editing, the user provides image URLs alongside the prompt.

Notes

• Print `MEDIA:<path>` for OC auto-attach — no extra delivery logic needed.
• Image saved locally (format auto-detected from URL: png/jpg/webp). URL expires ~24h but local file persists.
• `quality: 4K` incurs additional charges.
• `image_urls` accepts up to 10 URLs (each ≤10MB, formats: jpeg/jpg/png/webp).