Image To Image | Unknown | API Documentation

Image To Image

fal-ai/image-to-image

Inference

Private

About

A single API for image-to-image, built on fal that supports all Stable Diffusion variants, checkpoints and LoRAs from HuggingFace (🤗) and CivitAI.

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

Migrate to `@fal-ai/client`

The @fal-ai/serverless-client package has been deprecated in favor of @fal-ai/client. Please check the migration guide for more information.

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/image-to-image", {
  input: {
    model_name: "stabilityai/stable-diffusion-xl-base-1.0",
    prompt: "an island near sea, with seagulls, moon shining over the sea, light house, boats int he background, fish flying over the sea",
    image_url: "https://storage.googleapis.com/falserverless/model_tests/lcm/beach.png"
  },
  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"
});

Protect your API Key

When running code on the client-side (e.g. in a browser, mobile app or GUI applications), make sure to not expose your FAL_KEY. Instead, use a server-side proxy to make requests to the API. For more information, check out our server-side integration guide.

3. Queue#

Long-running requests

For long-running requests, such as training jobs or models with slower inference times, it is recommended to check the Queue status and rely on Webhooks instead of blocking while waiting for the result.

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/image-to-image", {
  input: {
    model_name: "stabilityai/stable-diffusion-xl-base-1.0",
    prompt: "an island near sea, with seagulls, moon shining over the sea, light house, boats int he background, fish flying over the sea",
    image_url: "https://storage.googleapis.com/falserverless/model_tests/lcm/beach.png"
  },
  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/image-to-image", {
  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/image-to-image", {
  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);

Auto uploads

The client will auto-upload the file for you if you pass a binary object (e.g. File, Data).

Read more about file handling in our file upload guide.

5. Schema#

Input#

model_name string* required

URL or HuggingFace ID of the base model to generate the image.

model_architecture ModelArchitectureEnum

The architecture of the model to use. If an HF model is used, it will be automatically detected. Otherwise will assume depending on the model name (whether XL is in the name or not).

Possible enum values: sd, sdxl

prompt string* required

The prompt to use for generating the image. Be as descriptive as possible for best results.

image_url string* required

The URL of the image to use as a starting point for the generation.

negative_prompt string

The negative prompt to use. Use it to address details that you don't want in the image. This could be colors, objects, scenery and even the small details (e.g. moustache, blurry, low resolution). Default value: ""

loras list<LoraWeight>

The LoRAs to use for the image generation. You can use any number of LoRAs and they will be merged together to generate the final image.

num_inference_steps integer

Increasing the amount of steps tells Stable Diffusion that it should take more steps to generate your final result which can increase the amount of detail in your image. Default value: 30

guidance_scale float

The CFG (Classifier Free Guidance) scale is a measure of how close you want the model to stick to your prompt when looking for a related image to show you. Default value: 7.5

strength float

The strength of the image. Default value: 0.8

image_size ImageSize | Enum

The size of the generated image. You can choose between some presets or custom height and width that must be multiples of 8. Default value: square_hd

Possible enum values: square_hd, square, portrait_4_3, portrait_16_9, landscape_4_3, landscape_16_9

Note: For custom image sizes, you can pass the width and height as an object:

"image_size": {
  "width": 1280,
  "height": 720
}

clip_skip integer

Skips part of the image generation process, leading to slightly different results. This means the image renders faster, too.

scheduler SchedulerEnum

Scheduler / sampler to use for the image denoising process.

Possible enum values: DPM++ 2M, DPM++ 2M Karras, DPM++ 2M SDE, DPM++ 2M SDE Karras, Euler, Euler A, LCM

num_images integer

Number of images to generate in one request. Note that the higher the batch size, the longer it will take to generate the images. Default value: 1

seed integer

The same seed and the same prompt given to the same version of Stable Diffusion will output the same image every time.

image_format ImageFormatEnum

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

Possible enum values: jpeg, png

enable_safety_checker boolean

If set to true, the safety checker will be enabled.

{
  "model_name": "stabilityai/stable-diffusion-xl-base-1.0",
  "prompt": "an island near sea, with seagulls, moon shining over the sea, light house, boats int he background, fish flying over the sea",
  "image_url": "https://storage.googleapis.com/falserverless/model_tests/lcm/beach.png",
  "negative_prompt": "cartoon, painting, illustration, worst quality, low quality, normal quality",
  "loras": [
    {
      "path": "https://civitai.com/api/download/models/135931",
      "scale": 1
    }
  ],
  "num_inference_steps": 30,
  "guidance_scale": 7.5,
  "strength": 0.8,
  "image_size": "square_hd",
  "num_images": 1,
  "image_format": "jpeg"
}

Output#

images list<Image>* required

The generated image files info.

seed integer* required

Seed of the generated Image. It will be the same value of the one passed in the input or the randomly generated that was used in case none was passed.

has_nsfw_concepts list<boolean>* required

Whether the generated images contain NSFW concepts.

{
  "images": [
    {
      "url": "",
      "content_type": "image/jpeg"
    }
  ]
}

Other types#

ImageSize#

width integer

The width of the generated image. Default value: 512

height integer

The height of the generated image. Default value: 512

LoraWeight#

path string* required

URL or the path to the LoRA weights.

scale float

The scale of the LoRA weight. This is used to scale the LoRA weight before merging it with the base model. Default value: 1

Image#

url string* required

width integer* required

height integer* required

content_type string

Default value: "image/jpeg"

Image To Image Unknown

Table of contents

1. Calling the API

2. Authentication

3. Queue

4. Files

5. Schema

About

1. Calling the API#

Install the client#

Migrate to @fal-ai/client

Setup your API Key#

Submit a request#

2. Authentication#

API Key#

Protect your API Key

3. Queue#

Long-running requests

Submit a request#

Fetch request status#

Get the result#

4. Files#

Data URI (base64)#

Hosted files (URL)#

Uploading files#

Auto uploads

5. Schema#

Input#

Output#

Other types#

ImageSize#

LoraWeight#

Image#

Migrate to `@fal-ai/client`