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iOS 9 SDK Development by Janie Clayton, Chris Adamson

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Core Image

Now that we have our photos posting properly to Twitter, wouldn’t it be fun to jazz them up a little? There are all kinds of apps out on the market to apply filters to your photos, and it would be really cool if we could do that, too. Well, guess what, we can!

Core Image is a framework that was introduced in iOS 5, but it existed in Mac OS X before that. Core Image contains over a hundred photo filters—objects that can manipulate image data—for you to use and incorporate into your projects. For iOS 9, Apple has rewritten both the iOS and OS X version of Core Image to share a common code base, so nearly all the Apple-provided filters are now available for both platforms. And, if that’s not enough, it’s also possible to write your ...

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