文本生成图像

概述

使用 Flux、Nano Banana Pro 以及其他前沿 AI 模型，从文本描述生成图像。本示例将带你完成从提交生成请求到获取最终图像的完整流程。

图像生成是异步的。你会立即收到一个 job ID，然后需要轮询结果，直到图像生成完成。

交互式 Playground

以下是不同语言的完整示例：

// npm install @krea-ai/sdk
import { Krea } from "@krea-ai/sdk";

const krea = new Krea({ apiKey: process.env.KREA_API_KEY });

const result = await krea.subscribe("image/bfl/flux-1-dev", {
  input: {
    prompt: "a serene mountain landscape at sunset",
    width: 1024,
    height: 576,
    steps: 28
  }
});

console.log(`Image ready: ${result.data?.urls[0]}`);

import requests
import time

API_BASE = "https://api.krea.ai"
API_TOKEN = "your-token-secret"

# Step 1: Create generation job
response = requests.post(
    f"{API_BASE}/generate/image/bfl/flux-1-dev",
    headers={
        "Authorization": f"Bearer {API_TOKEN}",
        "Content-Type": "application/json"
    },
    json={
        "prompt": "a serene mountain landscape at sunset",
        "width": 1024,
        "height": 576,
        "steps": 28
    }
)
job = response.json()
job_id = job["job_id"]

# Step 2: Poll for completion
while True:
    response = requests.get(
        f"{API_BASE}/jobs/{job_id}",
        headers={"Authorization": f"Bearer {API_TOKEN}"}
    )
    job = response.json()

    if job["status"] == "completed":
        image_url = job["result"]["urls"][0]
        print(f"Image ready: {image_url}")
        break
    if job["status"] in ("failed", "cancelled"):
        raise Exception(f"Job failed: {job['status']}")

    print(f"Status: {job['status']}")
    time.sleep(2)

package main

import (
    "bytes"
    "encoding/json"
    "fmt"
    "net/http"
    "time"
)

func main() {
    apiBase := "https://api.krea.ai"
    apiToken := "your-token-secret"
    client := &http.Client{}

    // Step 1: Create generation job
    payload := map[string]interface{}{
        "prompt": "a serene mountain landscape at sunset",
        "width":  1024,
        "height": 576,
        "steps":  28,
    }
    jsonData, _ := json.Marshal(payload)

    req, _ := http.NewRequest("POST", apiBase+"/generate/image/bfl/flux-1-dev", bytes.NewBuffer(jsonData))
    req.Header.Set("Authorization", "Bearer "+apiToken)
    req.Header.Set("Content-Type", "application/json")

    resp, _ := client.Do(req)
    var job map[string]interface{}
    json.NewDecoder(resp.Body).Decode(&job)
    resp.Body.Close()

    jobID := job["job_id"].(string)

    // Step 2: Poll for completion
    for {
        req, _ := http.NewRequest("GET", apiBase+"/jobs/"+jobID, nil)
        req.Header.Set("Authorization", "Bearer "+apiToken)

        resp, _ := client.Do(req)
        var jobStatus map[string]interface{}
        json.NewDecoder(resp.Body).Decode(&jobStatus)
        resp.Body.Close()

        switch jobStatus["status"] {
        case "completed":
            result := jobStatus["result"].(map[string]interface{})
            imageURL := result["urls"].([]interface{})[0].(string)
            fmt.Printf("Image ready: %s\n", imageURL)
            return
        case "failed", "cancelled":
            fmt.Printf("Job failed: %s\n", jobStatus["status"])
            return
        }

        fmt.Printf("Status: %s\n", jobStatus["status"])
        time.Sleep(2 * time.Second)
    }
}

# Step 1: Create generation job
curl -X POST https://api.krea.ai/generate/image/bfl/flux-1-dev \
  -H "Authorization: Bearer YOUR_API_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "prompt": "a serene mountain landscape at sunset",
    "width": 1024,
    "height": 576,
    "steps": 28
  }'

# Response: {"job_id": "550e8400-e29b-41d4-a716-446655440000", ...}

# Step 2: Poll for completion (repeat until completed)
curl -X GET https://api.krea.ai/jobs/550e8400-e29b-41d4-a716-446655440000 \
  -H "Authorization: Bearer YOUR_API_TOKEN"

替换为你的 API Token要替换上述示例中的 YOUR_API_TOKEN 占位符，你需要在 krea.ai/settings/api-tokens 生成一个 API token。如果需要帮助，请参考 API Keys & Billing 页面上的说明。

要查看所有可用模型，请访问 Model APIs 页面。

分步说明

下面我们将带你完成从提交生成请求到获取最终图像的完整流程。

步骤 1：创建图像生成任务

向 /generate/image/bfl/flux-1-dev 发送 POST 请求，附带你的提示词和参数。API 会立即返回一个 job ID——生成过程是异步的。

// npm install @krea-ai/sdk
import { Krea } from "@krea-ai/sdk";

const krea = new Krea({ apiKey: process.env.KREA_API_KEY });

const job = await krea.image("bfl/flux-1-dev", {
  prompt: "a serene mountain landscape at sunset",
  width: 1024,
  height: 576,
  steps: 28
});

console.log(`Job ID: ${job.job_id}`);

curl -X POST https://api.krea.ai/generate/image/bfl/flux-1-dev \
  -H "Authorization: Bearer YOUR_API_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "prompt": "a serene mountain landscape at sunset",
    "width": 1024,
    "height": 576,
    "steps": 28
  }'

import requests

API_BASE = "https://api.krea.ai"
API_TOKEN = "your-token-secret"

response = requests.post(
    f"{API_BASE}/generate/image/bfl/flux-1-dev",
    headers={
        "Authorization": f"Bearer {API_TOKEN}",
        "Content-Type": "application/json"
    },
    json={
        "prompt": "a serene mountain landscape at sunset",
        "width": 1024,
        "height": 576,
        "steps": 28
    }
)

job = response.json()
print(f"Job ID: {job['job_id']}")

package main

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

func main() {
    apiBase := "https://api.krea.ai"
    apiToken := "your-token-secret"

    payload := map[string]interface{}{
        "prompt": "a serene mountain landscape at sunset",
        "width": 1024,
        "height": 576,
        "steps": 28,
    }

    jsonData, _ := json.Marshal(payload)
    req, _ := http.NewRequest("POST", apiBase+"/generate/image/bfl/flux-1-dev", bytes.NewBuffer(jsonData))
    req.Header.Set("Authorization", "Bearer "+apiToken)
    req.Header.Set("Content-Type", "application/json")

    client := &http.Client{}
    resp, _ := client.Do(req)
    defer resp.Body.Close()

    var job map[string]interface{}
    json.NewDecoder(resp.Body).Decode(&job)
    fmt.Printf("Job ID: %s\n", job["job_id"])
}

示例响应

{
  "job_id": "550e8400-e29b-41d4-a716-446655440000",
  "status": "queued",
  "created_at": "2025-01-15T10:30:00.000Z"
}

步骤 2：轮询结果

每 2 秒轮询一次 /jobs/{job_id}，直到任务完成。Krea API 会为部分模型提供中间生成结果。

// npm install @krea-ai/sdk
import { Krea } from "@krea-ai/sdk";

const krea = new Krea({ apiKey: process.env.KREA_API_KEY });

async function waitForJob(jobId) {
  const completed = await krea.jobs.wait(jobId, { intervalMs: 2000 });
  return completed.result.urls[0];
}

const imageUrl = await waitForJob(job.job_id);
console.log(`Image ready: ${imageUrl}`);

# Check job status
curl -X GET https://api.krea.ai/jobs/YOUR_JOB_ID \
  -H "Authorization: Bearer YOUR_API_TOKEN"

import time

def wait_for_job(job_id):
    while True:
        response = requests.get(
            f"{API_BASE}/jobs/{job_id}",
            headers={"Authorization": f"Bearer {API_TOKEN}"}
        )
        job = response.json()

        if job["status"] == "completed":
            return job["result"]["urls"][0]
        if job["status"] in ("failed", "cancelled"):
            raise Exception(f"Job failed: {job['status']}")

        print(f"Status: {job['status']}")
        time.sleep(2)

image_url = wait_for_job(job["job_id"])
print(f"Image ready: {image_url}")

func waitForJob(jobID string) (string, error) {
    for {
        req, _ := http.NewRequest("GET", apiBase+"/jobs/"+jobID, nil)
        req.Header.Set("Authorization", "Bearer "+apiToken)

        resp, _ := client.Do(req)
        var job map[string]interface{}
        json.NewDecoder(resp.Body).Decode(&job)
        resp.Body.Close()

        switch job["status"] {
        case "completed":
            result := job["result"].(map[string]interface{})
            urls := result["urls"].([]interface{})
            return urls[0].(string), nil
        case "failed", "cancelled":
            return "", fmt.Errorf("job failed: %s", job["status"])
        }

        fmt.Printf("Status: %s\n", job["status"])
        time.Sleep(2 * time.Second)
    }
}

Webhook 可用！设置 webhook，可在任务完成时收到通知。参见 Webhooks 指南开始使用。

要查看所有模型的详细参数列表，请访问 Model APIs 页面。

示例完成响应

{
  "job_id": "550e8400-e29b-41d4-a716-446655440000",
  "status": "completed",
  "created_at": "2025-01-15T10:30:00.000Z",
  "completed_at": "2025-01-15T10:30:25.000Z",
  "result": {
    "urls": [
      "https://krea.ai/generations/your-image.png"
    ]
  }
}

要了解所有可能的任务状态以及完整的任务生命周期，请查看 Job Lifecycle 页面。

​热门模型

​概述

​交互式 Playground

​分步说明

​步骤 1：创建图像生成任务

​步骤 2：轮询结果

热门模型

概述

交互式 Playground

分步说明

步骤 1：创建图像生成任务

步骤 2：轮询结果