ImageKit.io Docs
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What is ImageKit.io?
📌Getting Started
Getting started
How to use ImageKit.io?
🔧External storage
Integration overview
How it works?
Configure origin
URL-endpoints
ImageKit.io storage
Media Library
Limits and troubleshooting
Limits
Error troubleshooting
Testing and Infrastructure Setup
Testing on multiple environments
Using on multiple websites
Using with your CDN
Using with a custom domain name
✨Features
Image Transformations
Resize, crop and other common transformations
Overlay
Image enhancement & color manipulation
Chained transformations
Supported text font list
Image Optimization
Video Transformation (Beta release)
Video Optimization (Beta release)
Named Transformations
Network-based image optimization
Client hints
Caches
Cache purging
Security
SEO-friendly image URL
Default Images
Progressive JPEGs
Non-image file compression
Performance monitoring
User access management
Platform guides
Magento
WordPress
Shopify
Sample projects
Upload widget
Media library widget
📙API Reference
API Introduction
Upload file API
Media API
Metadata API
Custom metadata fields API
EXTENSIONS
Extensions reference
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Image enhancement & color manipulation

Image enhancement

Contrast stretch - (e-contrast)

It is used to automatically enhance the contrast of the image by using the full intensity values that particular image format allows. This means that the lighter sections of an image become even lighter and the darker sections becomes even brighter, thereby enhancing the contrast.

Sharpen - (e-sharpen)

It is used to sharpen the input image. It is useful when highlighting the edges and finer details within an image.
Example usage - e-sharpen-<number> 
If just the e-sharpen  parameter is used, then a default sharpening is performed on the input image. The default behaviour can be controlled by specifying a number that restricts the extent of sharpening performed.

Unsharp mask - (e-usm)

​Unsharp Masking (USM) is an image sharpening technique. This transform allows you to apply and control unsharp masks on your images.
Example usage - e-usm-<radius>-<sigma>-<amount>-<threshold>
The amount of sharpening can be varied using 4 parameters - radius , sigma , amount , and threshold. This results in perceptually better images compared to using e-sharpen. Only positive floating points are allowed for these 4 parameters.
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Overlay
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Chained transformations
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Contents
Image enhancement
Contrast stretch - (e-contrast)
Sharpen - (e-sharpen)
Unsharp mask - (e-usm)