Leonardo Lightning XL - Image Generator

High-speed AI image generation model by Leonardo AI. Lightning XL delivers ultra-fast image generation without compromising quality, featuring Alchemy enhancement, Prompt Magic, advanced negative prompting capabilities, and optimized performance for rapid creative workflows and high-volume content production.

Endpoint

POSThttps://api.1min.ai/api/features

Request Headers

Field	Value
API-KEY	`<api-key>`
Content-Type	`application/json`

Parameters

Parameter	Type	Required	Description
`type`	string	Yes	Feature type identifier. Must be `IMAGE_GENERATOR`
`model`	string	Yes	AI model identifier. Must be `b24e16ff-06e3-43eb-8d33-4416c2d75876`
`promptObject`	object	Yes	Configuration object containing all generation parameters

Prompt Object Parameters

Basic Parameters

Parameter	Type	Required	Description	Default
`prompt`	string	Yes	Text description of the image to generate	-
`size`	string	Yes	Generated image dimensions	1024x1024
`n`	number	Yes	Number of images to generate (1-4)	1
`negativePrompt`	string	No	Describe what you don't want in the image	-

Leonardo Common Parameters

Parameter	Type	Required	Description	Default	Range
`leonardo_guidance_scale`	integer	No	How strongly generation reflects the prompt	7	1-20
`leonardo_num_inference_steps`	integer	No	Number of inference steps for generation	15	10-60
`leonardo_seed`	integer	No	Fixed seed for consistency across generations	-	0-9999999998
`leonardo_tilling`	boolean	No	Whether images should tile on all axes	false	-
`leonardo_transparency`	string	No	Type of transparency to use	-	disabled, foreground_only
`leonardo_preset_style`	string	No	Style preset for generation	-	Dynamic based on Alchemy settings

Image Guidance Parameters

Parameter	Type	Required	Description	Default	Range
`leonardo_image_prompts`	array	No	Upload images to use as image prompts	-	Max 4 images
`leonardo_init_image_id`	string	No	Init image ID to influence generation features	-	Required for Fantasy Avatar
`leonardo_init_strength`	float	No	How strongly generated images reflect init image	-	0.1-0.9
`leonardo_fantasy_avatar`	boolean	No	Enable Fantasy Avatar feature (requires Init Image ID when enabled)	false	-

Alchemy Parameters

Parameter	Type	Required	Description	Default	Range
`leonardo_alchemy`	boolean	No	Enable Alchemy enhancement	true	-
`leonardo_contrast_ratio`	float	No	Contrast ratio for Alchemy	-	0-1
`leonardo_expanded_domain`	boolean	No	Enable Expanded Domain feature	false	-
`leonardo_photo_real`	boolean	No	Enable PhotoReal feature	false	-
`leonardo_photo_real_version`	string	No	PhotoReal version (automatically set to v2 when PhotoReal is enabled)	v2	v2
`leonardo_photo_real_strength`	float	No	PhotoReal depth of field (v1 only)	0.55	0.45, 0.5, 0.55

Prompt Magic Parameters

Parameter	Type	Required	Description	Default	Range
`leonardo_prompt_magic`	boolean	No	Enable Prompt Magic	false	-
`leonardo_prompt_magic_version`	string	No	Prompt Magic version	v3	v2, v3
`leonardo_prompt_magic_strength`	float	No	Strength of Prompt Magic	-	0.1-1.0
`leonardo_hight_constrast`	boolean	No	Enable High Contrast (controls RAW mode)	false	-
`leonardo_hight_resolution`	boolean	No	Enable High Resolution	false	-

Enhance Prompt Parameters

Parameter	Type	Required	Description	Default
`leonardo_enhance_prompt`	boolean	No	Enable prompt enhancement	false
`leonardo_enhance_prompt_instruction`	string	No	Instructions for prompt enhancement	-

Supported Image Sizes

Size	Resolution	Use Case
512x512	Standard square	Quick generations, thumbnails
1024x768	Landscape	Wide aspect ratio images
768x1024	Portrait	Vertical aspect ratio images
1024x1024	High-res square	High-quality square images

Lightning XL Features

Feature	Description
Lightning Speed	Ultra-fast generation optimized for rapid iteration
Alchemy Enhancement	Advanced AI processing for superior quality
Prompt Magic	AI-powered prompt expansion and optimization
PhotoReal Technology	Photorealistic image generation
Advanced Negative Prompting	Precise exclusion controls for results
High Resolution	Enhanced detail and clarity
Batch Processing	Efficient multiple image creation
Professional Output	Commercial-grade image quality

Code Examples

cURL
JavaScript
Python

curl --location 'https://api.1min.ai/api/features' \
--header 'API-KEY: <api-key>' \
--header 'Content-Type: application/json' \
--data '{
"type": "IMAGE_GENERATOR",
"model": "b24e16ff-06e3-43eb-8d33-4416c2d75876",
"promptObject": {
  "prompt": "Professional business portrait in modern office, corporate lighting, high resolution",
  "negativePrompt": "blurry, distorted, low quality, cartoon, amateur",
  "size": "1024x1024",
  "n": 1,
  "leonardo_alchemy": true,
  "leonardo_guidance_scale": 8,
  "leonardo_num_inference_steps": 20,
  "leonardo_prompt_magic": true,
  "leonardo_prompt_magic_version": "v3"
}
}'

fetch('https://api.1min.ai/api/features', {
method: 'POST',
headers: {
  'Content-Type': 'application/json',
  'API-KEY': 'YOUR_API_KEY'
},
body: JSON.stringify({
  type: 'IMAGE_GENERATOR',
  model: 'b24e16ff-06e3-43eb-8d33-4416c2d75876',
  promptObject: {
    prompt: 'Professional business portrait in modern office, corporate lighting, high resolution',
    negativePrompt: 'blurry, distorted, low quality, cartoon, amateur',
    size: '1024x1024',
    n: 1,
    leonardo_alchemy: true,
    leonardo_guidance_scale: 8,
    leonardo_num_inference_steps: 20,
    leonardo_prompt_magic: true,
    leonardo_prompt_magic_version: 'v3'
  }
})
})

import requests

url = "https://api.1min.ai/api/features"
headers = {
"Content-Type": "application/json",
"API-KEY": "YOUR_API_KEY"
}

data = {
"type": "IMAGE_GENERATOR",
"model": "b24e16ff-06e3-43eb-8d33-4416c2d75876",
"promptObject": {
  "prompt": "Professional business portrait in modern office, corporate lighting, high resolution",
  "negativePrompt": "blurry, distorted, low quality, cartoon, amateur",
  "size": "1024x1024",
  "n": 1,
  "leonardo_alchemy": True,
  "leonardo_guidance_scale": 8,
  "leonardo_num_inference_steps": 20,
  "leonardo_prompt_magic": True,
  "leonardo_prompt_magic_version": "v3"
}
}

response = requests.post(url, headers=headers, json=data)

Interactive Playground

API Playground

https://api.1min.ai/api/features

Prompt *

Describe the image you want to generate

Negative Prompt

Describe what you don't want in the image

Image Size *

Generated image dimensions

Number of Images *

Number of images to generate (1-4)

Guidance Scale

How strongly generation reflects the prompt (1-20)

Inference Steps

Number of inference steps (10-60)

Seed

Fixed seed for consistency (0-9999999998)

Tilling

Enable tiling on all axes

Transparency

Type of transparency to use

Alchemy

Enable Alchemy enhancement

Contrast Ratio

Alchemy contrast ratio (0-1)

Expanded Domain

Enable Expanded Domain feature

Photo Real

Enable PhotoReal feature

Init Strength

How strongly generated images reflect init image (0.1-0.9)

Fantasy Avatar

Enable Fantasy Avatar feature (requires Init Image ID when enabled)

Prompt Magic

Enable Prompt Magic

Prompt Magic Version

Prompt Magic version (v2 or v3)

Prompt Magic Strength

Strength of Prompt Magic (0.1-1.0)

High Contrast

Enable High Contrast (controls RAW mode)

High Resolution

Enable High Resolution

Enhance Prompt

Enable prompt enhancement

Enhance Prompt Instruction

Instructions for prompt enhancement

Generated cURL Command:

curl -X POST "https://api.1min.ai/api/features" \
  -H "API-KEY: <your-api-key>" \
  -H "Content-Type: application/json" \
  -d '{
  "type": "IMAGE_GENERATOR",
  "model": "b24e16ff-06e3-43eb-8d33-4416c2d75876",
  "promptObject": {
    "prompt": "Professional business portrait in modern office, corporate lighting, high resolution",
    "negativePrompt": "blurry, distorted, low quality, cartoon, amateur",
    "size": "1024x1024",
    "n": 1,
    "leonardo_alchemy": true,
    "leonardo_guidance_scale": 8,
    "leonardo_num_inference_steps": 20
  }
}'

Response Format

{
"aiRecord": {
  "uuid": "e4f5g6h7-i8j9-0123-4567-890123defghi",
  "userId": "user-12345",
  "teamId": "team-67890",
  "model": "b24e16ff-06e3-43eb-8d33-4416c2d75876",
  "type": "IMAGE_GENERATOR",
  "status": "SUCCESS",
  "createdAt": "2025-01-15T10:50:00.000Z",
  "aiRecordDetail": {
    "promptObject": {
      "prompt": "Professional business portrait in modern office, corporate lighting, high resolution",
      "negativePrompt": "blurry, distorted, low quality, cartoon, amateur",
      "size": "1024x1024",
      "n": 1,
      "leonardo_alchemy": true,
      "leonardo_guidance_scale": 8,
      "leonardo_num_inference_steps": 20,
      "leonardo_prompt_magic": true,
      "leonardo_prompt_magic_version": "v3"
    },
    "resultObject": [
      "development/images/2025_01_15_10_50_45_001_lightning_portrait.webp"
    ]
  },
  "temporaryUrl": "https://s3.us-east-1.amazonaws.com/asset.1min.ai/development/images/2025_01_15_10_50_45_001_lightning_portrait.webp?X-Amz-Algorithm=AWS4-HMAC-SHA256&..."
}
}

Use Cases

High-Volume Production

Content Marketing: Rapid creation of marketing visuals and social media content
E-commerce: Fast product photography and catalog imagery
A/B Testing: Quick iteration for testing different visual approaches
Rapid Prototyping: Fast visual concept development and validation
Blog Content: Quick creation of article illustrations and headers

Professional Applications

Corporate Photography: Business portraits, team photos, professional headshots
Event Coverage: Quick generation of event-related imagery
Presentation Graphics: Fast creation of slide visuals and diagrams
Training Materials: Rapid development of educational content
Documentation: Quick visual aids for technical documentation

Creative Workflows

Design Iteration: Fast generation of multiple design variations
Concept Art: Rapid exploration of visual ideas and themes
Storyboarding: Quick creation of visual sequences
Character Design: Fast iteration on character concepts
Environmental Art: Rapid generation of background and setting imagery

Endpoint​

Request Headers​

Parameters​

Prompt Object Parameters​

Basic Parameters​

Leonardo Common Parameters​

Image Guidance Parameters​

Alchemy Parameters​

Prompt Magic Parameters​

Enhance Prompt Parameters​

Supported Image Sizes​

Lightning XL Features​

Code Examples​

Interactive Playground​