This is a StackBlur implementation for iOS based on the algorithm of: http://incubator.quasimondo.com/processing/fast_blur_deluxe.php by Mario Klingemann To use it, just import the UIImage+StackBlur.h and .m in your project. Then, to blur an image: UIImage *newIma=[oldIma stackBlur:radius]; You can also apply the method to a buffer directly if you dont'have access to the full UIImage (see applyStackBlurToBuffer) The algorithm expect an RGBA format (32 bits/pixel). If it's not the case, the image will be transformed in a 32 bits/pixel format at each call. You can also use the [UIImage normalize] function of the library to do it once UIImage *myIma=[[UIImage imageNamed:@"blackWhite.png"] normalized]; ... UIImage *blurIma=[myIm stackBlur:radius]; Radius must be higher than 1 ... thomas.landspurg@gmail.com License: New BSD license.