Google 会使用 AI 技术将内容翻译成您偏好的语言。AI 翻译可能包含错误。

使用 Gemini 生成图片

您可以使用 Gemini 根据文本提示生成图片。支持的界面包括 Google Cloud 控制台和 Agent Platform API。

以下 Gemini 模型支持图片生成：

点击即可展开支持的模型

如需详细了解 Gemini 模型功能，请参阅 Gemini 模型。

生成图片

以下内容介绍了如何使用 Agent Studio 或 API 生成图片。

如需详细了解提示的最佳实践，请参阅设计多模态提示。

控制台

如需使用 Gemini 生成图片，请执行以下操作：

依次打开 Agent Studio > 创建提示。
点击切换模型，然后选择一个显示的模型。
在输出面板中，从下拉菜单中选择图片和文本。
在编写提示文本区域中，撰写要生成的图片的说明。
点击提示 () 按钮。

Gemini 会根据您的说明生成图片。此过程需要几秒钟，但可能会相对较慢，具体取决于容量。

Python

安装

pip install --upgrade google-genai

如需了解详情，请参阅 SDK 参考文档。

设置环境变量以将 Google Gen AI SDK 与 Vertex AI 搭配使用：

# Replace the `GOOGLE_CLOUD_PROJECT` and `GOOGLE_CLOUD_LOCATION` values
# with appropriate values for your project.
export GOOGLE_CLOUD_PROJECT=GOOGLE_CLOUD_PROJECT
export GOOGLE_CLOUD_LOCATION=global
export GOOGLE_GENAI_USE_ENTERPRISE=True

import os
from io import BytesIO

from google import genai
from google.genai.types import GenerateContentConfig, Modality
from PIL import Image

client = genai.Client()

response = client.models.generate_content(
    model="gemini-3.1-flash-image",
    contents=("Generate an image of the Eiffel tower with fireworks in the background."),
    config=GenerateContentConfig(
        response_modalities=[Modality.TEXT, Modality.IMAGE],
    ),
)
for part in response.candidates[0].content.parts:
    if part.text:
        print(part.text)
    elif part.inline_data:
        image = Image.open(BytesIO((part.inline_data.data)))
        # Ensure the output directory exists
        output_dir = "output_folder"
        os.makedirs(output_dir, exist_ok=True)
        image.save(os.path.join(output_dir, "example-image-eiffel-tower.png"))

Go

了解如何安装或更新 Go。

如需了解详情，请参阅 SDK 参考文档。

设置环境变量以将 Google Gen AI SDK 与 Vertex AI 搭配使用：

# Replace the `GOOGLE_CLOUD_PROJECT` and `GOOGLE_CLOUD_LOCATION` values
# with appropriate values for your project.
export GOOGLE_CLOUD_PROJECT=GOOGLE_CLOUD_PROJECT
export GOOGLE_CLOUD_LOCATION=global
export GOOGLE_GENAI_USE_ENTERPRISE=True

import (
	"context"
	"fmt"
	"io"
	"os"

	"google.golang.org/genai"
)

// generateMMFlashWithText demonstrates how to generate both text and image outputs.
func generateMMFlashWithText(w io.Writer) error {
	ctx := context.Background()

	client, err := genai.NewClient(ctx, &genai.ClientConfig{
		HTTPOptions: genai.HTTPOptions{APIVersion: "v1"},
	})
	if err != nil {
		return fmt.Errorf("failed to create genai client: %w", err)
	}

	modelName := "gemini-2.5-flash-image"
	contents := []*genai.Content{
		{
			Parts: []*genai.Part{
				{Text: "Generate an image of the Eiffel tower with fireworks in the background."},
			},
			Role: genai.RoleUser,
		},
	}

	resp, err := client.Models.GenerateContent(ctx,
		modelName,
		contents,
		&genai.GenerateContentConfig{
			ResponseModalities: []string{
				string(genai.ModalityText),
				string(genai.ModalityImage),
			},
			CandidateCount: int32(1),
			SafetySettings: []*genai.SafetySetting{
				{Method: genai.HarmBlockMethodProbability},
				{Category: genai.HarmCategoryDangerousContent},
				{Threshold: genai.HarmBlockThresholdBlockMediumAndAbove},
			},
		},
	)
	if err != nil {
		return fmt.Errorf("failed to generate content: %w", err)
	}

	if len(resp.Candidates) == 0 || resp.Candidates[0].Content == nil {
		return fmt.Errorf("no candidates returned")
	}
	var fileName string
	for _, part := range resp.Candidates[0].Content.Parts {
		if part.Text != "" {
			fmt.Fprintln(w, part.Text)
		} else if part.InlineData != nil {
			fileName = "example-image-eiffel-tower.png"
			if err := os.WriteFile(fileName, part.InlineData.Data, 0o644); err != nil {
				return fmt.Errorf("failed to save image: %w", err)
			}
		}
	}
	fmt.Fprintln(w, fileName)

	// Example response:
	// I will generate an image of the Eiffel Tower at night, with a vibrant display of
	// colorful fireworks exploding in the dark sky behind it.
	// ....
	return nil
}

Node.js

安装

npm install @google/genai

如需了解详情，请参阅 SDK 参考文档。

设置环境变量以将 Google Gen AI SDK 与 Vertex AI 搭配使用：

# Replace the `GOOGLE_CLOUD_PROJECT` and `GOOGLE_CLOUD_LOCATION` values
# with appropriate values for your project.
export GOOGLE_CLOUD_PROJECT=GOOGLE_CLOUD_PROJECT
export GOOGLE_CLOUD_LOCATION=global
export GOOGLE_GENAI_USE_ENTERPRISE=True

const fs = require('fs');
const {GoogleGenAI, Modality} = require('@google/genai');

const GOOGLE_CLOUD_PROJECT = process.env.GOOGLE_CLOUD_PROJECT;
const GOOGLE_CLOUD_LOCATION =
  process.env.GOOGLE_CLOUD_LOCATION || 'us-central1';

async function generateImage(
  projectId = GOOGLE_CLOUD_PROJECT,
  location = GOOGLE_CLOUD_LOCATION
) {
  const client = new GoogleGenAI({
    vertexai: true,
    project: projectId,
    location: location,
  });

  const response = await client.models.generateContentStream({
    model: 'gemini-2.5-flash-image',
    contents:
      'Generate an image of the Eiffel tower with fireworks in the background.',
    config: {
      responseModalities: [Modality.TEXT, Modality.IMAGE],
    },
  });

  const generatedFileNames = [];
  let imageIndex = 0;

  for await (const chunk of response) {
    const text = chunk.text;
    const data = chunk.data;
    if (text) {
      console.debug(text);
    } else if (data) {
      const outputDir = 'output-folder';
      if (!fs.existsSync(outputDir)) {
        fs.mkdirSync(outputDir, {recursive: true});
      }
      const fileName = `${outputDir}/generate_content_streaming_image_${imageIndex++}.png`;
      console.debug(`Writing response image to file: ${fileName}.`);
      try {
        fs.writeFileSync(fileName, data);
        generatedFileNames.push(fileName);
      } catch (error) {
        console.error(`Failed to write image file ${fileName}:`, error);
      }
    }
  }

  // Example response:
  //  I will generate an image of the Eiffel Tower at night, with a vibrant display of
  //  colorful fireworks exploding in the dark sky behind it. The tower will be
  //  illuminated, standing tall as the focal point of the scene, with the bursts of
  //  light from the fireworks creating a festive atmosphere.

  return generatedFileNames;
}

Java

了解如何安装或更新 Java。

如需了解详情，请参阅 SDK 参考文档。

设置环境变量以将 Google Gen AI SDK 与 Vertex AI 搭配使用：

# Replace the `GOOGLE_CLOUD_PROJECT` and `GOOGLE_CLOUD_LOCATION` values
# with appropriate values for your project.
export GOOGLE_CLOUD_PROJECT=GOOGLE_CLOUD_PROJECT
export GOOGLE_CLOUD_LOCATION=global
export GOOGLE_GENAI_USE_ENTERPRISE=True


import com.google.genai.Client;
import com.google.genai.types.Blob;
import com.google.genai.types.Candidate;
import com.google.genai.types.Content;
import com.google.genai.types.GenerateContentConfig;
import com.google.genai.types.GenerateContentResponse;
import com.google.genai.types.Part;
import com.google.genai.types.SafetySetting;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.imageio.ImageIO;

public class ImageGenMmFlashWithText {

  public static void main(String[] args) throws IOException {
    // TODO(developer): Replace these variables before running the sample.
    String modelId = "gemini-2.5-flash-image";
    String outputFile = "resources/output/example-image-eiffel-tower.png";
    generateContent(modelId, outputFile);
  }

  // Generates an image with text input
  public static void generateContent(String modelId, String outputFile) throws IOException {
    // Client Initialization. Once created, it can be reused for multiple requests.
    try (Client client = Client.builder().location("global").vertexAI(true).build()) {

      GenerateContentConfig contentConfig =
          GenerateContentConfig.builder()
              .responseModalities("TEXT", "IMAGE")
              .candidateCount(1)
              .safetySettings(
                  SafetySetting.builder()
                      .method("PROBABILITY")
                      .category("HARM_CATEGORY_DANGEROUS_CONTENT")
                      .threshold("BLOCK_MEDIUM_AND_ABOVE")
                      .build())
              .build();

      GenerateContentResponse response =
          client.models.generateContent(
              modelId,
              "Generate an image of the Eiffel tower with fireworks in the background.",
              contentConfig);

      // Get parts of the response
      List<Part> parts =
          response
              .candidates()
              .flatMap(candidates -> candidates.stream().findFirst())
              .flatMap(Candidate::content)
              .flatMap(Content::parts)
              .orElse(new ArrayList<>());

      // For each part print text if present, otherwise read image data if present and
      // write it to the output file
      for (Part part : parts) {
        if (part.text().isPresent()) {
          System.out.println(part.text().get());
        } else if (part.inlineData().flatMap(Blob::data).isPresent()) {
          BufferedImage image =
              ImageIO.read(new ByteArrayInputStream(part.inlineData().flatMap(Blob::data).get()));
          ImageIO.write(image, "png", new File(outputFile));
        }
      }

      System.out.println("Content written to: " + outputFile);
      // Example response:
      // Here is the Eiffel Tower with fireworks in the background...
      //
      // Content written to: resources/output/example-image-eiffel-tower.png
    }
  }
}

REST

在终端中运行以下命令，在当前目录中创建或覆盖此文件：

curl -X POST \
  -H "Authorization: Bearer $(gcloud auth print-access-token)" \
  -H "Content-Type: application/json" \
  https://${API_ENDPOINT}:generateContent \
  -d '{
    "contents": {
      "role": "USER",
      "parts": [
        {
          "text": "Create a tutorial explaining how to make a peanut butter and jelly sandwich in three easy steps."
        }
      ]
    },
    "generationConfig": {
      "responseModalities": ["TEXT", "IMAGE"],
      "imageConfig": {
        "aspectRatio": "16:9",
      },
     },
     "safetySettings": {
      "method": "PROBABILITY",
      "category": "HARM_CATEGORY_DANGEROUS_CONTENT",
      "threshold": "BLOCK_MEDIUM_AND_ABOVE"
    },
  }' 2>/dev/null >response.json

Gemini 会根据您的说明生成图片。此过程需要几秒钟，但可能会相对较慢，具体取决于容量。

生成图文交织的内容

您可以使用 Gemini 生成图文交织的回答。例如，您可以为所生成食谱中的每个步骤生成图片，而无需单独向模型发出请求。

以下 Gemini 模型支持生成交错图片和文本：

点击即可展开支持的模型

控制台

如需生成交错图片和文本回答，请执行以下操作：

依次打开 Agent Studio > 创建提示。
点击切换模型，然后选择一个显示的模型。
在输出面板中，从下拉菜单中选择图片和文本。
在编写提示文本区域中，撰写要生成的图片的说明。例如，“创建一个教程，说明如何通过三个步骤制作花生酱和果酱三明治。对于每个步骤，提供一个包含步骤编号的标题、一段说明，并生成一张图片，每张图片的宽高比为 1:1。”
点击提示 () 按钮。

Gemini 会根据您的说明生成回答。此过程需要几秒钟，但可能会相对较慢，具体取决于容量。

Python

安装

pip install --upgrade google-genai

如需了解详情，请参阅 SDK 参考文档。

设置环境变量以将 Google Gen AI SDK 与 Vertex AI 搭配使用：

# Replace the `GOOGLE_CLOUD_PROJECT` and `GOOGLE_CLOUD_LOCATION` values
# with appropriate values for your project.
export GOOGLE_CLOUD_PROJECT=GOOGLE_CLOUD_PROJECT
export GOOGLE_CLOUD_LOCATION=global
export GOOGLE_GENAI_USE_ENTERPRISE=True

from google import genai
from google.genai.types import GenerateContentConfig, Modality
from PIL import Image
from io import BytesIO

client = genai.Client()

response = client.models.generate_content(
    model="gemini-3.1-flash-image",
    contents=(
        "Generate an illustrated recipe for a paella."
        "Create images to go alongside the text as you generate the recipe"
    ),
    config=GenerateContentConfig(response_modalities=[Modality.TEXT, Modality.IMAGE]),
)
with open("output_folder/paella-recipe.md", "w") as fp:
    for i, part in enumerate(response.candidates[0].content.parts):
        if part.text is not None:
            fp.write(part.text)
        elif part.inline_data is not None:
            image = Image.open(BytesIO((part.inline_data.data)))
            image.save(f"output_folder/example-image-{i+1}.png")
            fp.write(f"![image](example-image-{i+1}.png)")

Java

了解如何安装或更新 Java。

如需了解详情，请参阅 SDK 参考文档。

设置环境变量以将 Google Gen AI SDK 与 Vertex AI 搭配使用：

# Replace the `GOOGLE_CLOUD_PROJECT` and `GOOGLE_CLOUD_LOCATION` values
# with appropriate values for your project.
export GOOGLE_CLOUD_PROJECT=GOOGLE_CLOUD_PROJECT
export GOOGLE_CLOUD_LOCATION=global
export GOOGLE_GENAI_USE_ENTERPRISE=True


import com.google.genai.Client;
import com.google.genai.types.Blob;
import com.google.genai.types.Candidate;
import com.google.genai.types.Content;
import com.google.genai.types.GenerateContentConfig;
import com.google.genai.types.GenerateContentResponse;
import com.google.genai.types.Part;
import java.awt.image.BufferedImage;
import java.io.BufferedWriter;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.imageio.ImageIO;

public class ImageGenMmFlashTextAndImageWithText {

  public static void main(String[] args) throws IOException {
    // TODO(developer): Replace these variables before running the sample.
    String modelId = "gemini-2.5-flash-image";
    String outputFile = "resources/output/paella-recipe.md";
    generateContent(modelId, outputFile);
  }

  // Generates text and image with text input
  public static void generateContent(String modelId, String outputFile) throws IOException {
    // Client Initialization. Once created, it can be reused for multiple requests.
    try (Client client = Client.builder().location("global").vertexAI(true).build()) {

      GenerateContentResponse response =
          client.models.generateContent(
              modelId,
              Content.fromParts(
                  Part.fromText("Generate an illustrated recipe for a paella."),
                  Part.fromText(
                      "Create images to go alongside the text as you generate the recipe.")),
              GenerateContentConfig.builder().responseModalities("TEXT", "IMAGE").build());

      try (BufferedWriter writer = new BufferedWriter(new FileWriter(outputFile))) {

        // Get parts of the response
        List<Part> parts =
            response
                .candidates()
                .flatMap(candidates -> candidates.stream().findFirst())
                .flatMap(Candidate::content)
                .flatMap(Content::parts)
                .orElse(new ArrayList<>());

        int index = 1;
        // For each part print text if present, otherwise read image data if present and
        // write it to the output file
        for (Part part : parts) {
          if (part.text().isPresent()) {
            writer.write(part.text().get());
          } else if (part.inlineData().flatMap(Blob::data).isPresent()) {
            BufferedImage image =
                ImageIO.read(new ByteArrayInputStream(part.inlineData().flatMap(Blob::data).get()));
            ImageIO.write(
                image, "png", new File("resources/output/example-image-" + index + ".png"));
            writer.write("![image](example-image-" + index + ".png)");
          }
          index++;
        }

        System.out.println("Content written to: " + outputFile);

        // Example response:
        // A markdown page for a Paella recipe(`paella-recipe.md`) has been generated.
        // It includes detailed steps and several images illustrating the cooking process.
        //
        // Content written to:  resources/output/paella-recipe.md
      }
    }
  }
}

Go

了解如何安装或更新 Go。

如需了解详情，请参阅 SDK 参考文档。

设置环境变量以将 Google Gen AI SDK 与 Vertex AI 搭配使用：

# Replace the `GOOGLE_CLOUD_PROJECT` and `GOOGLE_CLOUD_LOCATION` values
# with appropriate values for your project.
export GOOGLE_CLOUD_PROJECT=GOOGLE_CLOUD_PROJECT
export GOOGLE_CLOUD_LOCATION=global
export GOOGLE_GENAI_USE_ENTERPRISE=True

import (
	"context"
	"fmt"
	"io"
	"os"
	"path/filepath"

	"google.golang.org/genai"
)

// generateMMFlashTxtImgWithText demonstrates how to generate an illustrated recipe
// combining text and image outputs into a markdown file.
func generateMMFlashTxtImgWithText(w io.Writer) error {
	ctx := context.Background()

	client, err := genai.NewClient(ctx, &genai.ClientConfig{
		HTTPOptions: genai.HTTPOptions{APIVersion: "v1"},
	})
	if err != nil {
		return fmt.Errorf("failed to create genai client: %w", err)
	}

	modelName := "gemini-2.5-flash-image"
	contents := []*genai.Content{
		{
			Parts: []*genai.Part{
				{Text: "Generate an illustrated recipe for a paella. " +
					"Create images to go alongside the text as you generate the recipe."},
			},
			Role: genai.RoleUser,
		},
	}

	resp, err := client.Models.GenerateContent(ctx,
		modelName,
		contents,
		&genai.GenerateContentConfig{
			ResponseModalities: []string{
				string(genai.ModalityText),
				string(genai.ModalityImage),
			},
			CandidateCount: int32(1),
		},
	)
	if err != nil {
		return fmt.Errorf("failed to generate content: %w", err)
	}

	if len(resp.Candidates) == 0 || resp.Candidates[0].Content == nil {
		return fmt.Errorf("no candidates returned")
	}

	outputFolder := ""

	// Create the markdown file
	mdFile := filepath.Join(outputFolder, "paella-recipe.md")
	fp, err := os.Create(mdFile)
	if err != nil {
		return fmt.Errorf("failed to create markdown file: %w", err)
	}
	defer fp.Close()

	for i, part := range resp.Candidates[0].Content.Parts {
		if part.Text != "" {
			if _, err := fp.WriteString(part.Text); err != nil {
				return fmt.Errorf("failed to write text: %w", err)
			}
		} else if part.InlineData != nil {
			imgFile := filepath.Join(outputFolder, fmt.Sprintf("example-image-%d.png", i+1))
			if err := os.WriteFile(imgFile, part.InlineData.Data, 0644); err != nil {
				return fmt.Errorf("failed to save image: %w", err)
			}
			if _, err := fp.WriteString(fmt.Sprintf("![image](%s)", filepath.Base(imgFile))); err != nil {
				return fmt.Errorf("failed to write image reference: %w", err)
			}
		}
	}

	fmt.Fprintln(w, mdFile)

	// Example response:
	//  A markdown page for a Paella recipe (`paella-recipe.md`) has been generated.
	//  It includes detailed steps and several images illustrating the cooking process.
	return nil
}

Node.js

安装

npm install @google/genai

如需了解详情，请参阅 SDK 参考文档。

设置环境变量以将 Google Gen AI SDK 与 Vertex AI 搭配使用：

# Replace the `GOOGLE_CLOUD_PROJECT` and `GOOGLE_CLOUD_LOCATION` values
# with appropriate values for your project.
export GOOGLE_CLOUD_PROJECT=GOOGLE_CLOUD_PROJECT
export GOOGLE_CLOUD_LOCATION=global
export GOOGLE_GENAI_USE_ENTERPRISE=True

const fs = require('fs');
const {GoogleGenAI, Modality} = require('@google/genai');

const GOOGLE_CLOUD_PROJECT = process.env.GOOGLE_CLOUD_PROJECT;
const GOOGLE_CLOUD_LOCATION =
  process.env.GOOGLE_CLOUD_LOCATION || 'us-central1';

async function savePaellaRecipe(response) {
  const parts = response.candidates[0].content.parts;

  let mdText = '';
  const outputDir = 'output-folder';

  for (let i = 0; i < parts.length; i++) {
    const part = parts[i];

    if (part.text) {
      mdText += part.text + '\n';
    } else if (part.inlineData) {
      if (!fs.existsSync(outputDir)) {
        fs.mkdirSync(outputDir, {recursive: true});
      }
      const imageBytes = Buffer.from(part.inlineData.data, 'base64');
      const imagePath = `example-image-${i + 1}.png`;
      const saveImagePath = `${outputDir}/${imagePath}`;

      fs.writeFileSync(saveImagePath, imageBytes);
      mdText += `![image](./${imagePath})\n`;
    }
  }
  const mdFile = `${outputDir}/paella-recipe.md`;

  fs.writeFileSync(mdFile, mdText);
  console.log(`Saved recipe to: ${mdFile}`);
}

async function generateImage(
  projectId = GOOGLE_CLOUD_PROJECT,
  location = GOOGLE_CLOUD_LOCATION
) {
  const client = new GoogleGenAI({
    vertexai: true,
    project: projectId,
    location: location,
  });

  const response = await client.models.generateContent({
    model: 'gemini-2.5-flash-image',
    contents:
      'Generate an illustrated recipe for a paella. Create images to go alongside the text as you generate the recipe',
    config: {
      responseModalities: [Modality.TEXT, Modality.IMAGE],
    },
  });
  console.log(response);

  await savePaellaRecipe(response);

  return response;
}
// Example response:
//  A markdown page for a Paella recipe(`paella-recipe.md`) has been generated.
//  It includes detailed steps and several images illustrating the cooking process.

REST

在终端中运行以下命令，在当前目录中创建或覆盖此文件：

curl -X POST \
  -H "Authorization: Bearer $(gcloud auth print-access-token)" \
  -H "Content-Type: application/json" \
  https://${API_ENDPOINT}:generateContent \
  -d '{
    "contents": {
      "role": "USER",
      "parts": [
        {
          "text": "Generate an illustrated recipe for a paella. Create images to
          go alongside the text as you generate the recipe."
        }
      ]
    },
    "generationConfig": {
      "responseModalities": ["TEXT", "IMAGE"],
      "imageConfig": {
        "aspectRatio": "16:9",
      },
    },
    "safetySettings": {
      "method": "PROBABILITY",
      "category": "HARM_CATEGORY_DANGEROUS_CONTENT",
      "threshold": "BLOCK_MEDIUM_AND_ABOVE"
    },
  }' 2>/dev/null >response.json

Gemini 会根据您的说明生成图片。此过程需要几秒钟，但可能会相对较慢，具体取决于容量。

将生成的图片保存到 Cloud Storage

您可以配置 generateContent 和 streamGenerateContent 请求，将生成的图片直接写入 Cloud Storage 存储桶，并在 fileData.fileUri 中返回对象 URI，而不是在回答中以内嵌方式返回原始 base64 编码的图片字节。

以下 Gemini 模型支持 Cloud Storage 输出持久化：

Gemini Nano Banana 2.1 (gemini-nano-banana-2.1)
Gemini 3.1 Flash Image (gemini-3.1-flash-image)
Gemini 3.1 Flash-Lite Image (gemini-3.1-flash-lite-image)
Gemini 3 Pro Image (gemini-3-pro-image)

前提条件

在发送具有 Cloud Storage 输出持久性的请求之前，请验证对请求进行身份验证的主账号在目标 Cloud Storage 存储桶上是否具有以下 Identity and Access Management 权限：

storage.objects.create（包含在 Storage Object Creator 角色 roles/storage.objectCreator 等角色中）

在生成图片之前，该服务会使用调用方的凭据验证目标 Cloud Storage 存储桶的 storage.objects.create 权限。如果 Cloud Storage 存储桶不存在、调用方缺少写入权限，或者 VPC Service Controls 边界阻止了写入，则请求会在生成之前失败，并返回 403 PERMISSION_DENIED 错误。

发送包含 Cloud Storage 输出的请求

如需将生成的图片直接写入 Cloud Storage，请在 generateContent 或 streamGenerateContent 请求中配置以下两个字段：

将 outputConfig.outputUriPrefix 设置为目标 Cloud Storage 存储桶或文件夹前缀（例如 gs://BUCKET_NAME/PREFIX/）。
将 generationConfig.responseFormat[].image.delivery 设置为 "URI"。

以下 REST 请求会生成图片并将其直接写入 Cloud Storage 存储桶：

curl -X POST \
  -H "Authorization: Bearer $(gcloud auth print-access-token)" \
  -H "Content-Type: application/json" \
  "https://aiplatform.googleapis.com/v1/projects/PROJECT_ID/locations/global/publishers/google/models/gemini-nano-banana-2.1:generateContent" \
  -d '{
    "contents": [
      {
        "role": "USER",
        "parts": [
          {
            "text": "Create an architectural rendering of a sustainable glass greenhouse in alpine snow."
          }
        ]
      }
    ],
    "generationConfig": {
      "responseModalities": ["TEXT", "IMAGE"],
      "responseFormat": [
        {
          "image": {
            "delivery": "URI"
          }
        }
      ]
    },
    "outputConfig": {
      "outputUriPrefix": "gs://BUCKET_NAME/PREFIX/"
    }
  }'

替换以下内容：

PROJECT_ID：您的 Google Cloud 项目 ID。
BUCKET_NAME：目标 Cloud Storage 存储桶的名称。
PREFIX：Cloud Storage 存储桶内的可选文件夹路径前缀（例如 outputs）。

该服务会使用命名模式 gs://BUCKETNAME/PREFIX/imageGENERATIONID.EXTENSION（当回答包含多个候选图片时，附加 CANDIDATEINDEX；当候选图片包含多张图片时，附加 IMAGE_INDEX）将每个生成的图片部分写入 Cloud Storage，并在 fileData 中返回 URI：

{
  "candidates": [
    {
      "content": {
        "role": "model",
        "parts": [
          {
            "fileData": {
              "mimeType": "image/png",
              "fileUri": "gs://my-bucket/outputs/image_1234567890.png"
            }
          }
        ]
      }
    }
  ]
}

配置 Cloud Storage 输出传送后，该服务会按如下方式处理响应：

图文混合回答：TEXT 和 IMAGE 回答中的文本部分在 parts[].text 中保持内嵌。只有生成的图片部分会写入 Cloud Storage，并作为 parts[].fileData 对象返回。
思考图片：当 generationConfig.thinkingConfig.includeThoughts 设置为 true 时，中间思考图片 (parts[].thought: true) 也会使用 thoughtimageGENERATION_ID 前缀写入 Cloud Storage，并作为 parts[].fileData 对象返回。
流式响应 (streamGenerateContent)：在发送引用其 fileData.fileUri 的响应块之前，每个生成的图片都会写入 Cloud Storage。
无图片响应：如果请求仅返回文本或被安全过滤器屏蔽，则不会向 Cloud Storage 写入任何对象。
加密和保留：写入的对象会继承目标 Cloud Storage 存储桶的加密配置（包括客户管理的加密密钥 [CMEK]），并遵循 Cloud Storage 存储桶的生命周期管理规则。

限制

Cloud Storage 输出具有以下限制：

使用跨项目 Cloud Storage 存储桶进行多轮编辑：该服务使用发送请求的主体的凭据写入生成的图片。但是，当多轮对话中的后续请求通过其 fileData.fileUri 引用生成的图片时，服务会使用调用项目 (service-PROJECT_NUMBER@gcp-sa-aiplatform.) 的 Gemini Enterprise Agent Platform 服务代理读取该对象。如果目标 Cloud Storage 存储桶位于其他项目中，并且服务代理对该 Cloud Storage 存储桶没有 storage.objects.get 权限，则后续请求会失败，并显示 403 PERMISSION_DENIED 错误，即使原始写入成功也是如此。

如需在多轮编辑中使用生成的图片作为输入，请向服务代理授予对目标 Cloud Storage 存储桶的读取权限（例如，Storage Object Viewer 角色 roles/storage.objectViewer）。

后续步骤

如需详细了解 Gemini 图片生成功能，请参阅以下链接：

使用 Gemini 生成图片 使用集合让一切井井有条 根据您的偏好保存内容并对其进行分类。

点击即可展开支持的模型

生成图片

控制台

Python

安装

Go

Node.js

安装

Java

REST

生成图文交织的内容

点击即可展开支持的模型

控制台

Python

安装

Java

Go

Node.js

安装

REST

将生成的图片保存到 Cloud Storage

前提条件

发送包含 Cloud Storage 输出的请求

限制

后续步骤

使用 Gemini 生成图片