---
title: "Define CoreImage frameworks main Classes in iOS."  
description: "Define CoreImage frameworks main Classes in iOS."  
author: "Tarun Kumar"  
published: 2015-12-09  
updated: 2020-09-19  
canonical: https://www.mindstick.com/interview/22935/define-coreimage-frameworks-main-classes-in-ios  
category: "iphone"  
tags: ["iphone", "ios", "objective c"]  
reading_time: 2 minutes  

---

# Define CoreImage frameworks main Classes in iOS.

CoreImage framework provides main three classes which handles image processing on **iOS** and **OS**-**X** application development:\
1. **CIFilter** - it is a mutable object that represents an effect, using it we can modify existing filters by coding them with preset values or by changing them. A filter object has at least one input parameter and produces an output image.\
2. **CIImage** - it is an **immutable object** that represents an image. This class hold the image data and can be creating from a UIImage, from an image file, or from pixel data. We can synthesize image data or provide it from a file or the output of another CIFilter object.\
3. **CIContext** - it is an object through which Core Image draws the results produced by a filter. All of the processing of a core image is done in a CIContext. This is somewhat similar to a Core Graphics or OpenGL context.

## Answers

### Answer by Tarun Kumar

CoreImage framework provides main three classes which handles image processing on **iOS** and **OS**-**X** application development:\
1. **CIFilter** - it is a mutable object that represents an effect, using it we can modify existing filters by coding them with preset values or by changing them. A filter object has at least one input parameter and produces an output image.\
2. **CIImage** - it is an **immutable object** that represents an image. This class hold the image data and can be creating from a UIImage, from an image file, or from pixel data. We can synthesize image data or provide it from a file or the output of another CIFilter object.\
3. **CIContext** - it is an object through which Core Image draws the results produced by a filter. All of the processing of a core image is done in a CIContext. This is somewhat similar to a Core Graphics or OpenGL context.


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