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

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"
}
}'

JavaScript

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'
  }
})
})

Python

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

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

Prompt *

Describe the image you want to generate

Professional business portrait in modern office, corporate lighting, high resolution

Negative Prompt

Describe what you don't want in the image

blurry, distorted, low quality, cartoon, amateur

Image Size *

Generated image dimensions

512x512 - Square Standard1024x768 - Landscape768x1024 - Portrait1024x1024 - Square HD

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

DisabledForeground Only

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)

v2v3

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

Advanced Lightning Optimization

Speed-Focused Parameters

1. Inference Steps: Use 15-25 steps for optimal speed vs quality balance
2. Guidance Scale: 7-10 range provides good results with faster processing
3. Batch Generation: Generate 2-4 images simultaneously for efficiency
4. Simplified Prompts: Clear, concise descriptions process faster

Quality Enhancement with Speed

1. Alchemy + Lightning: Combine for enhanced quality without significant speed loss
2. Prompt Magic v3: Latest version optimizes both speed and output quality
3. High Resolution: Selectively use for final versions, not iterations
4. Strategic Negative Prompting: Prevent common issues to avoid regeneration

Workflow Optimization

1. Iterative Refinement: Start with basic settings, enhance successful generations
2. Seed Consistency: Use fixed seeds for consistent style across series
3. Template Prompts: Develop prompt templates for common use cases
4. Batch Processing: Generate multiple variations in single requests

Negative Prompting Strategies

Quality Control

• Basic Quality: "blurry, low quality, distorted, pixelated, amateur"
• Professional Standard: "unprofessional, poorly lit, bad composition, low resolution"
• Technical Issues: "artifacts, noise, compression, overexposed, underexposed"

Style Management

• Realism Control: "cartoon, anime, sketch, drawing, painted, illustration"
• Photography Focus: "digital art, CGI, rendered, synthetic, artificial"
• Professional Look: "casual, informal, snapshot, candid, amateur"

Content Filtering

• Unwanted Elements: "text, watermark, signature, logo, border, frame"
• Background Control: "cluttered, messy, distracting, busy background"
• Composition Issues: "cropped, cut off, partial, incomplete, truncated"

Lightning XL Best Practices

Speed Optimization

1. Concise Prompts: Keep descriptions clear and focused
2. Effective Negatives: Use comprehensive negative prompts to avoid issues
3. Batch Efficiency: Generate multiple images per request
4. Parameter Balance: Find optimal settings for your use case

Quality Maintenance

1. Strategic Enhancement: Use Alchemy for important projects
2. Prompt Magic: Enable for improved prompt interpretation
3. Resolution Planning: Choose appropriate size for end use
4. Iterative Improvement: Refine based on initial results

Production Workflows

1. Template Development: Create reusable prompt structures
2. Style Consistency: Use seeds and settings for brand alignment
3. Quality Control: Establish negative prompt libraries
4. Efficiency Metrics: Track generation time vs quality for optimization

Credit Usage

Leonardo Lightning XL generation costs by image size and quantity:

Size	1 Image	2 Images	3 Images	4 Images
512x512	234 credits	234 credits	260 credits	286 credits
1024x768	260 credits	312 credits	364 credits	416 credits
768x1024	260 credits	312 credits	364 credits	416 credits
1024x1024	286 credits	338 credits	416 credits	468 credits

Lightning Efficiency

Lightning XL provides excellent cost-per-speed ratio. For high-volume work, consider generating multiple variations per request to maximize efficiency.

Notes

Lightning Speed Advantage

Lightning XL is specifically optimized for rapid generation without quality compromise, making it ideal for high-volume content production and iterative design workflows.

Advanced Features

All Leonardo AI advanced features (Alchemy, Prompt Magic, PhotoReal) are available with Lightning XL, maintaining quality while maximizing speed.

High-Volume Usage

For extensive batch processing, monitor credit usage and consider implementing efficient prompt strategies to optimize cost-effectiveness.

Authentication

This endpoint requires an API key to be provided in the API-KEY header.