Today I came across an excellent library allowing for the ability to perform common image manipulations such as filtering, resizing, and masking very easily known as NYXImageUtilities. Many different manipulations are built in, for instance you can crop your image with 9 different alignments or use any of the the three built in filters.
With just a line or two of code you can perform many different image manipulations, and the project is being actively updated (recently added is the ability to save your images) requiring iOS 4.
You can find the project along with a usage guide on Github here:
https://github.com/Nyx0uf/NYXImagesUtilities
A very handy class, easy to use, and very efficient.
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