Skip to content


Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
A set of handy categories for UIImage class. It allows filtering, resizing, masking, rotating.
branch: master

This branch is 104 commits behind Nyx0uf:master

Fetching latest commit…

Cannot retrieve the latest commit at this time

Failed to load latest commit information.
Other Sources


This is a project for iOS which regroups a collection of useful UIImage categories to handle operations such as filtering, blurring, masking, reflecting, resizing, rotating, saving. NYXImagesUtilities requires at least iOS 4.0, I don't intend to support older versions.


  • Link with QuartzCore framework then #import <QuartzCore/QuartzCore.h> in your Prefix.pch file.
  • Add the Categories and Helper directories to your project, and you are good to go !

If you want to use the saving category you must also link with :

  • ImageIO.framework
  • MobileCoreServices.framework

By default the methods return auto-released objects, if you want them to return retained objects in order to manage memory yourself, just uncomment the kNYXReturnRetainedObjects constant in NYXImagesHelper.h.


This category allows you to apply filters on a UIImage object, currently there are 3 filters : Sepia, Grayscale and changing opacity.

Sepia image

Using these filters is very easy :

UIImage* sepia = [myImage sepia];
UIImage* gray = [myImage grayscale];
UIImage* transparent = [myImage opacity:0.5f];


This category is composed of a single method which was originally written by Jeff Lamarche (@jeff_lamarche), you can read about it here.

It allows to blur an image by a given factor.

UIImage* blur = [myImage blurredCopyUsingGuassFactor:5 andPixelRadius:5];


This category is composed of a single method which allow to mask an image, you just have to create the mask you desire.

UIImage* masked = [myImage maskWithImage:[UIImage imageNamed:@"mask.png"]];


This category was written by Matthias Tretter (@myell0w) and is composed of a single method to create a reflected image.

UIImage* reflected = [myImage reflectedImageWithHeight:myImage.size.height fromAlpha:0.0f toAlpha:0.5f];


This category can be used to crop or to scale images.


You can crop your image by 9 different ways :

  1. Top left
  2. Top center
  3. Top right
  4. Bottom left
  5. Bottom center
  6. Bottom right
  7. Left center
  8. Right center
  9. Center

To crop an image object just call -(UIImage*)cropToSize:(CGSize)newSize usingMode:(NYXCropMode)cropMode; like this :

UIImage* cropped = [myImage cropToSize:(CGSize){width, height} usingMode:NYXCropModeCenter];

NYXCropMode is an enum type which can be found in the header file, it is used to represent the 9 modes above.

There is also a convenience method which crop from the top left corner by default : -(UIImage*)cropToSize:(CGSize)newSize;


You have the choice between two methods to scale images, the two methods will keep the aspect ratio of the original image.

UIImage* scaled1 = [myImage scaleByFactor:0.5f];
UIImage* scaled2 = [myImage scaleToFitSize:(CGSize){width, height}];


With this category you can rotate or flip an UIImage object, flipping is useful if you want to create a reflect effect.

UIImage* rotated1 = [myImage rotateInDegrees:217.0f];
UIImage* rotated2 = [myImage rotateInRadians:M_PI_2];

UIImage* flipped1 = [myImage verticalFlip];
UIImage* flipped2 = [myImage forizontalFlip];


This category allows you to save an UIImage object at a specified path or file URL, there are five types supported : BMP, GIF, JPG, PNG, TIFF.

To use it, you must link with ImageIO.framework and MobileCoreServices.framework.

[myImage saveToURL:url type:NYXImageTypeJPEG backgroundFillColor:nil];
[myImage saveToPath:path type:NYXImageTypeTIFF backgroundFillColor:[UIColor yellowColor]];

There is also two other methods which take only the path or URL as parameter and save the image in PNG, because it's the preferred format for iOS.

If your image contains transparent zone and you save it in a format that doesn't support alpha, a fill color will be used, if you don't specify one, the default color will be white.


NYXImageUtilities is released under the Simplified BSD license, see LICENSE.txt.

I hope you will find this useful, if you would like to see more features you can send me an email.

Benjamin Godard.

Blog :

Twitter : @Nyx0uf

Something went wrong with that request. Please try again.