> ## Documentation Index
> Fetch the complete documentation index at: https://gccai.heqingsong.uk/llms.txt
> Use this file to discover all available pages before exploring further.

# Upscale（放大选图）

> 对 Imagine 四宫格选取 U1–U4 中的一张得到单图，本地合成、通常瞬时返回

<RequestExample>
  ```bash cURL theme={null}
  curl --request POST \
    --url https://gccai.heqingsong.uk/v1/midjourney/generations/upscale \
    --header 'Authorization: Bearer <token>' \
    --header 'Content-Type: application/json' \
    --data '{
      "task_id": "task_01KQVZAPBW13W63DQNQZT7FCQK",
      "index": 1,
      "speed": "fast"
    }'
  ```

  ```python Python theme={null}
  import requests

  url = "https://gccai.heqingsong.uk/v1/midjourney/generations/upscale"

  payload = {
      "task_id": "task_01KQVZAPBW13W63DQNQZT7FCQK",
      "index": 1,
      "speed": "fast"
  }

  headers = {
      "Authorization": "Bearer <token>",
      "Content-Type": "application/json"
  }

  response = requests.post(url, json=payload, headers=headers)

  print(response.json())
  ```

  ```javascript JavaScript theme={null}
  const url = "https://gccai.heqingsong.uk/v1/midjourney/generations/upscale";

  const payload = {
    task_id: "task_01KQVZAPBW13W63DQNQZT7FCQK",
    index: 1,
    speed: "fast"
  };

  const headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
  };

  fetch(url, {
    method: "POST",
    headers: headers,
    body: JSON.stringify(payload)
  })
    .then(response => response.json())
    .then(data => console.log(data))
    .catch(error => console.error('Error:', error));
  ```

  ```go Go theme={null}
  package main

  import (
      "bytes"
      "encoding/json"
      "fmt"
      "io/ioutil"
      "net/http"
  )

  func main() {
      url := "https://gccai.heqingsong.uk/v1/midjourney/generations/upscale"

      payload := map[string]interface{}{
          "task_id": "task_01KQVZAPBW13W63DQNQZT7FCQK",
          "index": 1,
          "speed": "fast",
      }

      jsonData, _ := json.Marshal(payload)

      req, _ := http.NewRequest("POST", url, bytes.NewBuffer(jsonData))
      req.Header.Set("Authorization", "Bearer <token>")
      req.Header.Set("Content-Type", "application/json")

      client := &http.Client{}
      resp, err := client.Do(req)
      if err != nil {
          panic(err)
      }
      defer resp.Body.Close()

      body, _ := ioutil.ReadAll(resp.Body)
      fmt.Println(string(body))
  }
  ```

  ```java Java theme={null}
  import java.net.http.HttpClient;
  import java.net.http.HttpRequest;
  import java.net.http.HttpResponse;
  import java.net.URI;

  public class Main {
      public static void main(String[] args) throws Exception {
          String url = "https://gccai.heqingsong.uk/v1/midjourney/generations/upscale";

          String payload = """
          {
            "task_id": "task_01KQVZAPBW13W63DQNQZT7FCQK",
            "index": 1,
            "speed": "fast"
          }
          """;

          HttpClient client = HttpClient.newHttpClient();
          HttpRequest request = HttpRequest.newBuilder()
              .uri(URI.create(url))
              .header("Authorization", "Bearer <token>")
              .header("Content-Type", "application/json")
              .POST(HttpRequest.BodyPublishers.ofString(payload))
              .build();

          HttpResponse<String> response = client.send(request,
              HttpResponse.BodyHandlers.ofString());

          System.out.println(response.body());
      }
  }
  ```

  ```php PHP theme={null}
  <?php

  $url = "https://gccai.heqingsong.uk/v1/midjourney/generations/upscale";

  $payload = [
      "task_id" => "task_01KQVZAPBW13W63DQNQZT7FCQK",
      "index" => 1,
      "speed" => "fast",
  ];

  $ch = curl_init($url);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  curl_setopt($ch, CURLOPT_POST, true);
  curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($payload));
  curl_setopt($ch, CURLOPT_HTTPHEADER, [
      "Authorization: Bearer <token>",
      "Content-Type: application/json"
  ]);

  $response = curl_exec($ch);
  curl_close($ch);

  echo $response;
  ?>
  ```

  ```ruby Ruby theme={null}
  require 'net/http'
  require 'json'
  require 'uri'

  url = URI("https://gccai.heqingsong.uk/v1/midjourney/generations/upscale")

  payload = {
    task_id: "task_01KQVZAPBW13W63DQNQZT7FCQK",
    index: 1,
    speed: "fast",
  }

  http = Net::HTTP.new(url.host, url.port)
  http.use_ssl = true

  request = Net::HTTP::Post.new(url)
  request["Authorization"] = "Bearer <token>"
  request["Content-Type"] = "application/json"
  request.body = payload.to_json

  response = http.request(request)
  puts response.body
  ```

  ```swift Swift theme={null}
  import Foundation

  let url = URL(string: "https://gccai.heqingsong.uk/v1/midjourney/generations/upscale")!

  let payload: [String: Any] = [
      "task_id": "task_01KQVZAPBW13W63DQNQZT7FCQK",
      "index": 1,
      "speed": "fast",
  ]

  var request = URLRequest(url: url)
  request.httpMethod = "POST"
  request.setValue("Bearer <token>", forHTTPHeaderField: "Authorization")
  request.setValue("application/json", forHTTPHeaderField: "Content-Type")
  request.httpBody = try? JSONSerialization.data(withJSONObject: payload)

  let task = URLSession.shared.dataTask(with: request) { data, response, error in
      if let error = error {
          print("Error: \(error)")
          return
      }
      
      if let data = data, let responseString = String(data: data, encoding: .utf8) {
          print(responseString)
      }
  }

  task.resume()
  ```

  ```csharp C# theme={null}
  using System;
  using System.Net.Http;
  using System.Text;
  using System.Threading.Tasks;

  class Program
  {
      static async Task Main(string[] args)
      {
          var url = "https://gccai.heqingsong.uk/v1/midjourney/generations/upscale";

          var payload = @"{
              ""task_id"": ""task_01KQVZAPBW13W63DQNQZT7FCQK"",
              ""index"": 1,
              ""speed"": ""fast""
          }";

          using var client = new HttpClient();
          client.DefaultRequestHeaders.Add("Authorization", "Bearer <token>");

          var content = new StringContent(payload, Encoding.UTF8, "application/json");
          var response = await client.PostAsync(url, content);
          var result = await response.Content.ReadAsStringAsync();

          Console.WriteLine(result);
      }
  }
  ```

  ```c C theme={null}
  #include <stdio.h>
  #include <curl/curl.h>

  int main(void) {
      CURL *curl;
      CURLcode res;

      curl_global_init(CURL_GLOBAL_DEFAULT);
      curl = curl_easy_init();

      if(curl) {
          const char *url = "https://gccai.heqingsong.uk/v1/midjourney/generations/upscale";
          const char *payload = "{"
              "\"task_id\":\"task_01KQVZAPBW13W63DQNQZT7FCQK\","
              "\"index\":1,"
              "\"speed\":\"fast\""
          "}";

          struct curl_slist *headers = NULL;
          headers = curl_slist_append(headers, "Authorization: Bearer <token>");
          headers = curl_slist_append(headers, "Content-Type: application/json");

          curl_easy_setopt(curl, CURLOPT_URL, url);
          curl_easy_setopt(curl, CURLOPT_POSTFIELDS, payload);
          curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);

          res = curl_easy_perform(curl);

          if(res != CURLE_OK) {
              fprintf(stderr, "curl_easy_perform() failed: %s\n",
                      curl_easy_strerror(res));
          }

          curl_slist_free_all(headers);
          curl_easy_cleanup(curl);
      }

      curl_global_cleanup();
      return 0;
  }
  ```

  ```objectivec Objective-C theme={null}
  #import <Foundation/Foundation.h>

  int main(int argc, const char * argv[]) {
      @autoreleasepool {
          NSURL *url = [NSURL URLWithString:@"https://gccai.heqingsong.uk/v1/midjourney/generations/upscale"];
          
          NSDictionary *payload = @{
              @"task_id": @"task_01KQVZAPBW13W63DQNQZT7FCQK",
              @"index": @1,
              @"speed": @"fast",
          };
          
          NSError *error;
          NSData *jsonData = [NSJSONSerialization dataWithJSONObject:payload
                                                            options:0
                                                              error:&error];
          
          NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
          [request setHTTPMethod:@"POST"];
          [request setValue:@"Bearer <token>" forHTTPHeaderField:@"Authorization"];
          [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
          [request setHTTPBody:jsonData];
          
          NSURLSessionDataTask *task = [[NSURLSession sharedSession] 
              dataTaskWithRequest:request
              completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
                  if (error) {
                      NSLog(@"Error: %@", error);
                      return;
                  }
                  NSString *result = [[NSString alloc] initWithData:data 
                                                          encoding:NSUTF8StringEncoding];
                  NSLog(@"%@", result);
              }];
          
          [task resume];
          [[NSRunLoop mainRunLoop] run];
      }
      return 0;
  }
  ```

  ```ocaml OCaml theme={null}
  (* Requires cohttp and yojson libraries *)
  open Lwt
  open Cohttp
  open Cohttp_lwt_unix

  let url = "https://gccai.heqingsong.uk/v1/midjourney/generations/upscale"

  let payload = {|{
    "task_id": "task_01KQVZAPBW13W63DQNQZT7FCQK",
    "index": 1,
    "speed": "fast"
  }|}

  let () =
    let headers = Header.init ()
      |> fun h -> Header.add h "Authorization" "Bearer <token>"
      |> fun h -> Header.add h "Content-Type" "application/json"
    in
    let body = Cohttp_lwt.Body.of_string payload in
    
    let response = Client.post ~headers ~body (Uri.of_string url) >>= fun (resp, body) ->
      body |> Cohttp_lwt.Body.to_string >|= fun body_str ->
      print_endline body_str
    in
    Lwt_main.run response
  ```

  ```dart Dart theme={null}
  import 'dart:convert';
  import 'package:http/http.dart' as http;

  void main() async {
    final url = Uri.parse('https://gccai.heqingsong.uk/v1/midjourney/generations/upscale');
    
    final payload = {
      'task_id': 'task_01KQVZAPBW13W63DQNQZT7FCQK',
      'index': 1,
      'speed': 'fast',
    };
    
    final response = await http.post(
      url,
      headers: {
        'Authorization': 'Bearer <token>',
        'Content-Type': 'application/json',
      },
      body: jsonEncode(payload),
    );
    
    print(response.body);
  }
  ```

  ```r R theme={null}
  library(httr)
  library(jsonlite)

  url <- "https://gccai.heqingsong.uk/v1/midjourney/generations/upscale"

  payload <- list(
    task_id = "task_01KQVZAPBW13W63DQNQZT7FCQK",
    index = 1,
    speed = "fast"
  )

  response <- POST(
    url,
    add_headers(
      Authorization = "Bearer <token>",
      `Content-Type` = "application/json"
    ),
    body = toJSON(payload, auto_unbox = TRUE),
    encode = "raw"
  )

  cat(content(response, "text"))
  ```
</RequestExample>

<ResponseExample>
  ```json 200 theme={null}
  {
    "code": 200,
    "data": [
      {
        "status": "submitted",
        "task_id": "task_01KV52C0TEJSYZMCG0NCS4YWKK"
      }
    ]
  }
  ```

  ```json 400 theme={null}
  {
    "error": {
      "code": 400,
      "message": "请求参数无效",
      "type": "invalid_request_error"
    }
  }
  ```

  ```json 401 theme={null}
  {
    "error": {
      "code": 401,
      "message": "身份验证失败，请检查您的API密钥",
      "type": "authentication_error"
    }
  }
  ```

  ```json 402 theme={null}
  {
    "error": {
      "code": 402,
      "message": "账户余额不足，请充值后再试",
      "type": "payment_required"
    }
  }
  ```

  ```json 403 theme={null}
  {
    "error": {
      "code": 403,
      "message": "访问被禁止，您没有权限访问此资源",
      "type": "permission_error"
    }
  }
  ```

  ```json 404 theme={null}
  {
    "error": {
      "code": 404,
      "message": "任务不存在",
      "type": "not_found_error"
    }
  }
  ```

  ```json 429 theme={null}
  {
    "error": {
      "code": 429,
      "message": "请求过于频繁，请稍后再试",
      "type": "rate_limit_error"
    }
  }
  ```

  ```json 500 theme={null}
  {
    "error": {
      "code": 500,
      "message": "服务器内部错误，请稍后重试",
      "type": "server_error"
    }
  }
  ```

  ```json 502 theme={null}
  {
    "error": {
      "code": 502,
      "message": "网关错误，服务器暂时不可用",
      "type": "bad_gateway"
    }
  }
  ```
</ResponseExample>

对父任务四宫格（`grid_image_url`）选取 U1–U4 中的一张，得到单图。通过**从已有 4 张图里截取**实现，本地合成、通常瞬时返回。

| 项目     | 内容                                            |
| ------ | --------------------------------------------- |
| action | `UPSCALE`                                     |
| 计费     | `midjourney@upscale[-version][-speed]`        |
| 必填     | `task_id` + `index`，或 `task_id` + `custom_id` |
| 可选     | `speed`、`metadata`                            |

## 参数

| 字段          | 类型     | 说明                                                   |
| ----------- | ------ | ---------------------------------------------------- |
| `task_id`   | string | 父任务 ID（须为 imagine / variation / reroll 等 SUCCESS 任务） |
| `index`     | int    | 选第几张（U1–U4），范围 `1`–`4`；与 `custom_id` 二选一             |
| `custom_id` | string | 直接传对应操作的按钮 ID；与 `index` 二选一，传了它就不按 `index` 匹配        |
| `speed`     | string | `relax` / `fast` / `turbo`（本地合成，实际无影响）               |
| `metadata`  | object | 自定义元数据                                               |

## 请求示例

按 `index` 选图：

```json theme={null}
{
  "task_id": "task_01KQVZAPBW13W63DQNQZT7FCQK",
  "index": 1,
  "speed": "fast"
}
```

直接传按钮：

```json theme={null}
{
  "task_id": "task_01KQVZAPBW13W63DQNQZT7FCQK",
  "custom_id": "MJ::JOB::upsample::1::xxxx"
}
```

## 响应

提交返回新 `task_id`，**通常毫秒级即 SUCCESS**。SUCCESS 后 `image_urls` 只有 1 个元素（单图），`buttons` 含可继续的操作（zoom / inpaint / pan / variation 等）。

## 注意

* 父任务必须是 SUCCESS 状态，否则返回 `400`（`task is not in SUCCESS state`）。
* `index` 必须 `1`–`4`，越界返回 `400`；`custom_id` 与 `index` 二选一，都传时 `custom_id` 优先。
* 真正消耗资源的是 imagine 阶段，upscale 只是从已有图里挑，几乎不会失败。
* upscale 后的单图可继续用 Zoom / Inpaint / Variation。

## HD upscale（高清放大，输出 2x 单图）

普通 upscale 是**本地合成**——从父任务已有的 4 张图里截取其中一张，瞬时返回。如果后续要对单图做 zoom / inpaint 等精细操作，建议改用 **HD upscale**：执行真实放大，输出 **2x 高清单图**，约 60–120s 完成，产出的单图能更稳定地支持后续 zoom / inpaint。

HD upscale 通过 `custom_id` 指定放大命令，不同 imagine 版本对应不同命令：

| customId 命令               | 适用版本                  |
| ------------------------- | --------------------- |
| `upsample_v5_2x`          | v5 imagine            |
| `upsample_v5_4x`          | v5 imagine            |
| `upsample_v6_2x_subtle`   | v6 / v6.1 imagine     |
| `upsample_v6_2x_creative` | v6 / v6.1 imagine     |
| `upsample_v7_2x_subtle`   | **v7 / v8.1 imagine** |
| `upsample_v7_2x_creative` | v7 / v8.1 imagine     |

### HD upscale 示例

```json theme={null}
{
  "task_id": "task_01KQVZAPBW13W63DQNQZT7FCQK",
  "custom_id": "MJ::JOB::upsample_v7_2x_subtle::1::xxxx"
}
```

完成后得到一张真正的 2x 高清单图任务，可继续对它做 zoom / inpaint。

### 与普通 upscale 对比

| 维度 | 普通 upscale                 | HD upscale         |
| -- | -------------------------- | ------------------ |
| 实现 | 本地合成（截取）                   | 真实放大处理             |
| 耗时 | 毫秒级                        | 约 60–120s          |
| 输出 | 4 张里取第 N 张                 | **2x 高清单图**        |
| 后续 | zoom / inpaint / variation | zoom / inpaint 更稳定 |

### ⚠️ pan 仍不可用

即使是 HD upscale 产出的高清单图，**pan 操作仍会被拒**（返回"无效生图请求"）——这是 Midjourney 对 pan 操作本身的限制，与放大方式无关。详见 [Pan](./pan)。