Suggested approach: Some developers confuse Core Graphics and Core Image, which is a mistake – they are quite different. Core Image is used less often than Core Graphics, but is helpful for filtering images: blurring or sharpening, adjusting colors, and so on.
For bonus points, talk about Core Image being able to apply multiple effects efficiently, and how it can also generate some kinds of images too.
Estimated difficulty: Intermediate
See the full list of iOS interview questions
Link copied to your pasteboard.