# Flux Krea | Image to Image

FLUX.1 Krea [dev] is a 12B flow transformer that generates high-quality, aesthetic images from text for personal or commercial use.

## API Information

- **Model Slug:** flux-krea-image-to-image
- **Branded URL:** https://www.eachlabs.ai/black-forest-labs/flux-krea/flux-krea-image-to-image
- **Provider:** Black Forest Labs
- **Category:** Image to Image
- **Output Type:** image
- **Status:** active
- **Version:** 0.0.1
- **Base Cost:** Per-megapixel pricing: $0.035/MP (ceil rounding)
- **Estimated Processing Time:** 12 seconds
- **Last Updated:** 2026-04-27
- **Interactive Demo:** https://www.eachlabs.ai/ai-models/flux-krea-image-to-image

## Pricing

- **Charge Type:** dynamic
- **Pricing Details:** Per-megapixel pricing: $0.035/MP (ceil rounding)

### Pricing Rules

| Condition | Pricing |
| --- | --- |
| Rule 1 | Per-megapixel pricing: $0.035/MP (ceil rounding) |

## Input Schema

| Parameter | Type | Required | Default | Constraints | Description |
|-----------|------|----------|---------|-------------|-------------|
| image_url | string | Yes | - | - | The URL of the image to generate an image from. |
| strength | number | No | 0.95 | 0–1 | The strength of the initial image. Higher strength values are better for this model. |
| num_inference_steps | integer | No | 40 | 10–50 | The number of inference steps to perform. |
| prompt | string | Yes | - | - | The prompt to generate an image from. |
| seed | string | No | - | - | The same seed and the same prompt given to the same version of the model         will output the same image every time. |
| guidance_scale | number | No | 4.5 | 1–20 | 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. |
| num_images | integer | No | 1 | 1–4 | The number of images to generate. |
| enable_safety_checker | boolean | No | true | - | If set to true, the safety checker will be enabled. |
| output_format | string | No | jpeg | jpeg,png | The format of the generated image. |
| acceleration | string | No | none | none,regular,high | The speed of the generation. The higher the speed, the faster the generation. |

## Example Request

```bash
curl -X POST https://api.eachlabs.ai/v1/prediction/ \
  -H "X-API-Key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "flux-krea-image-to-image",
  "input": {
    "prompt": "A realistic dog dressed as a brave knight, wearing shiny medieval armor, standing proudly in front of a grand castle. The background shows a dramatic cloudy sky and castle walls, giving an epic fantasy atmosphere. Ultra-detailed, cinematic, and photorealistic style.",
    "image_url": "https://storage.googleapis.com/magicpoint/inputs/flux-krea-image-timage-input.jpg"
  }
}'
```

## Output Schema

Response returned by `GET /v1/prediction/{id}` when the job completes:

```json
{
  "status": "success",
  "predictionID": "string",
  "output": "string (URL of generated image)",
  "metrics": {
    "predict_time": "number (seconds)"
  }
}
```

## Polling

```bash
curl https://api.eachlabs.ai/v1/prediction/{PREDICTION_ID} \
  -H "X-API-Key: YOUR_API_KEY"
```

| Status | Meaning |
|--------|---------|
| `processing` | Still running — poll again |
| `success` | Done — read `output` |
| `error` | Failed — read `message` / `details` |

## Webhook (alternative to polling)

Pass `"webhook_url": "https://your.host/path"` in the create request. Eachlabs POSTs this payload when the job ends:

```json
{
  "exec_id": "prediction-uuid",
  "status": "succeeded",
  "output": "https://...",
  "error": ""
}
```

`status` is `"succeeded"` or `"failed"`. `exec_id` equals the `predictionID` from create. Return 2xx within 30 seconds.

## Errors

Error body: `{ "status": "error", "message": "...", "details": "..." }`

| Code | Meaning |
|------|---------|
| `400` | Invalid input |
| `401` | Missing / invalid `X-API-Key` |
| `404` | Unknown model or prediction id |
| `429` | Rate limit — 100 creates / min, 10 concurrent per key |
| `5xx` | Retry with backoff |

## Overview

**flux-krea-image-to-image — Image-to-Image AI Model**

flux-krea-image-to-image empowers creators to transform existing images with precise text-guided edits, solving the challenge of seamless modifications without losing original fidelity. Developed by Black Forest Labs as part of the **flux-krea** family in collaboration with Krea AI, this 12B parameter flow transformer model excels in **image-to-image AI** tasks, delivering photorealistic outputs that avoid the typical "AI look" for natural, aesthetic results. Ideal for developers seeking an **image-to-image AI model** with superior prompt adherence, it supports high-resolution edits up to 4 megapixels, making it perfect for production workflows in e-commerce and design.

## Usage Notes

- API Base URL: `https://api.eachlabs.ai/v1`
- Authentication: send `X-API-Key: YOUR_API_KEY`. Generate a key from the Eachlabs dashboard at https://www.eachlabs.ai/dashboard/api-keys.
- File-typed parameters (`*_url`, `image_url`, `video_url`, `audio_url`, etc.) accept publicly-reachable HTTPS URLs only. Upload your asset first (GCS / S3 / your CDN) and pass the resulting URL. Data-URIs and localhost URLs are rejected.
- For structured parameters (arrays / objects) send real JSON values, not stringified payloads.
- Monetary values are reported in USD; per-token / per-megapixel rates may be billed in micro-cents internally.
- Prefer `webhook_url` over polling for long-running predictions — see the Webhook Callback section.