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Imagen 4 Text to Image

fal-ai/imagen4/preview/fast
Google’s highest quality image generation model
Inference
Commercial use
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About

Generate images using Google's Imagen 4 fast model.

Imagen 4 fast is designed to generate high-quality images with enhanced detail, richer lighting, and fewer artifacts. The model excels at:

  • Capturing fine details and textures
  • Rendering diverse art styles from photorealism to animation
  • Understanding natural language prompts
  • Maintaining high visual quality and composition

1. Calling the API#

Install the client#

The client provides a convenient way to interact with the model API.

npm install --save @fal-ai/client

Setup your API Key#

Set FAL_KEY as an environment variable in your runtime.

export FAL_KEY="YOUR_API_KEY"

Submit a request#

The client API handles the API submit protocol. It will handle the request status updates and return the result when the request is completed.

import { fal } from "@fal-ai/client";

const result = await fal.subscribe("fal-ai/imagen4/preview/fast", {
  input: {
    prompt: "Atmospheric narrative illustration depicting a young woman with dark hair styled with a single star clip, eating dumplings at a small round table in a bustling, late-night eatery reminiscent of a vintage Hong Kong diner. The style blends clean linework with textured color fields, evoking a sense of place and story. The mood is intimate contentment amidst vibrant surroundings. Soft, warm overhead lighting from unseen hanging lamps casts gentle highlights on her face and the porcelain plate of dumplings, creating soft-edged shadows on the tiled tabletop and floor. The background features detailed elements like wall menus with stylized illustrations, a retro wall clock, steam rising from a soup bowl, and glimpses of other patrons blurred slightly for depth. The woman, viewed from a slightly high angle, crouches slightly on her chair, intensely focused on her food, rendered with expressive linework defining her pose and features. The color palette mixes muted teal wall tiles and green chairs with pops of warm yellow in her top, pink trousers, red chili oil dish, and ambient light, creating a cozy yet lively feel. Subtle paper texture or digital grain is visible throughout. Focus is sharp on the character and her immediate table setting"
  },
  logs: true,
  onQueueUpdate: (update) => {
    if (update.status === "IN_PROGRESS") {
      update.logs.map((log) => log.message).forEach(console.log);
    }
  },
});
console.log(result.data);
console.log(result.requestId);

2. Authentication#

The API uses an API Key for authentication. It is recommended you set the FAL_KEY environment variable in your runtime when possible.

API Key#

In case your app is running in an environment where you cannot set environment variables, you can set the API Key manually as a client configuration.
import { fal } from "@fal-ai/client";

fal.config({
  credentials: "YOUR_FAL_KEY"
});

3. Queue#

Submit a request#

The client API provides a convenient way to submit requests to the model.

import { fal } from "@fal-ai/client";

const { request_id } = await fal.queue.submit("fal-ai/imagen4/preview/fast", {
  input: {
    prompt: "Atmospheric narrative illustration depicting a young woman with dark hair styled with a single star clip, eating dumplings at a small round table in a bustling, late-night eatery reminiscent of a vintage Hong Kong diner. The style blends clean linework with textured color fields, evoking a sense of place and story. The mood is intimate contentment amidst vibrant surroundings. Soft, warm overhead lighting from unseen hanging lamps casts gentle highlights on her face and the porcelain plate of dumplings, creating soft-edged shadows on the tiled tabletop and floor. The background features detailed elements like wall menus with stylized illustrations, a retro wall clock, steam rising from a soup bowl, and glimpses of other patrons blurred slightly for depth. The woman, viewed from a slightly high angle, crouches slightly on her chair, intensely focused on her food, rendered with expressive linework defining her pose and features. The color palette mixes muted teal wall tiles and green chairs with pops of warm yellow in her top, pink trousers, red chili oil dish, and ambient light, creating a cozy yet lively feel. Subtle paper texture or digital grain is visible throughout. Focus is sharp on the character and her immediate table setting"
  },
  webhookUrl: "https://optional.webhook.url/for/results",
});

Fetch request status#

You can fetch the status of a request to check if it is completed or still in progress.

import { fal } from "@fal-ai/client";

const status = await fal.queue.status("fal-ai/imagen4/preview/fast", {
  requestId: "764cabcf-b745-4b3e-ae38-1200304cf45b",
  logs: true,
});

Get the result#

Once the request is completed, you can fetch the result. See the Output Schema for the expected result format.

import { fal } from "@fal-ai/client";

const result = await fal.queue.result("fal-ai/imagen4/preview/fast", {
  requestId: "764cabcf-b745-4b3e-ae38-1200304cf45b"
});
console.log(result.data);
console.log(result.requestId);

4. Files#

Some attributes in the API accept file URLs as input. Whenever that's the case you can pass your own URL or a Base64 data URI.

Data URI (base64)#

You can pass a Base64 data URI as a file input. The API will handle the file decoding for you. Keep in mind that for large files, this alternative although convenient can impact the request performance.

Hosted files (URL)#

You can also pass your own URLs as long as they are publicly accessible. Be aware that some hosts might block cross-site requests, rate-limit, or consider the request as a bot.

Uploading files#

We provide a convenient file storage that allows you to upload files and use them in your requests. You can upload files using the client API and use the returned URL in your requests.

import { fal } from "@fal-ai/client";

const file = new File(["Hello, World!"], "hello.txt", { type: "text/plain" });
const url = await fal.storage.upload(file);

Read more about file handling in our file upload guide.

5. Schema#

Input#

prompt string* required

The text prompt to generate an image from.

num_images integer

The number of images to generate. Default value: 1

aspect_ratio AspectRatioEnum

The aspect ratio of the generated image. Default value: "1:1"

Possible enum values: 1:1, 16:9, 9:16, 4:3, 3:4

output_format OutputFormatEnum

The format of the generated image. Default value: "png"

Possible enum values: jpeg, png, webp

sync_mode boolean

If True, the media will be returned as a data URI and the output data won't be available in the request history.

{
  "prompt": "Atmospheric narrative illustration depicting a young woman with dark hair styled with a single star clip, eating dumplings at a small round table in a bustling, late-night eatery reminiscent of a vintage Hong Kong diner. The style blends clean linework with textured color fields, evoking a sense of place and story. The mood is intimate contentment amidst vibrant surroundings. Soft, warm overhead lighting from unseen hanging lamps casts gentle highlights on her face and the porcelain plate of dumplings, creating soft-edged shadows on the tiled tabletop and floor. The background features detailed elements like wall menus with stylized illustrations, a retro wall clock, steam rising from a soup bowl, and glimpses of other patrons blurred slightly for depth. The woman, viewed from a slightly high angle, crouches slightly on her chair, intensely focused on her food, rendered with expressive linework defining her pose and features. The color palette mixes muted teal wall tiles and green chairs with pops of warm yellow in her top, pink trousers, red chili oil dish, and ambient light, creating a cozy yet lively feel. Subtle paper texture or digital grain is visible throughout. Focus is sharp on the character and her immediate table setting",
  "num_images": 1,
  "aspect_ratio": "1:1",
  "output_format": "png"
}

Output#

images list<ImageFile>* required

The generated images.

description string* required

The description of the generated images.

{
  "images": [
    {
      "file_name": "MNWc2sdR8v_VLWqVp7ag8_output.png",
      "content_type": "image/png",
      "url": "https://v3.fal.media/files/elephant/MNWc2sdR8v_VLWqVp7ag8_output.png"
    }
  ],
  "description": ""
}

Other types#

ImageFile#

url string* required

The URL where the file can be downloaded from.

content_type string

The mime type of the file.

file_name string

The name of the file. It will be auto-generated if not provided.

file_size integer

The size of the file in bytes.

width integer

The width of the image

height integer

The height of the image

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