Core Image Reference Collection
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Core Image is an image processing and analysis technology designed to provide near real-time processing for still and video images. In iOS and OS X you can use Core Image classes to:
Process images using the many built-in image filters
Chain together filters and then archive them for later use
Detect features (such as faces and eyes) in still and video images, and track faces in video images
Analyze images to get a set of auto adjustment filters
Create custom filters for use in your app
On OS X you can also package custom filters as Image Units that you can publish for use by others. For details, see Image Unit Tutorial.
To learn about using Core Image, read Core Image Programming Guide.