March 2013
Intermediate to advanced
1000 pages
34h 51m
English
Content preview from Programming iOS 6, 3rd EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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CIFilter and CIImage
The “CI” in CIFilter and CIImage stands for Core Image, a technology for transforming images through mathematical filters. Core Image started life on the desktop (Mac OS X), and migrated initially to iOS 5, bringing only a limited subset of the desktop filters, as iOS devices are not suitable for certain heavily intensive mathematical operations. In iOS 6, many more filters are provided; of about 140 filters available on the desktop, only about 40 are absent from iOS 6. To use Core Image, you’ll have to link your target to CoreImage.framework.
A filter is a CIFilter. The available filters fall naturally into several categories:
- Patterns and gradients
- These filters create CIImages that can then be combined with other CIImages, such as a single color, a checkerboard, stripes, or a gradient.
- Compositing
- These filters combine one image with another, using compositing blend modes familiar from image processing programs such as Photoshop.
- Color
- These filters adjust or otherwise modify the colors of an image. Thus you can alter an image’s saturation, hue, brightness, contrast, gamma and white point, exposure, shadows and highlights, and so on.
- Geometric
- These filters perform basic geometric transformations on an image, such as scaling, rotation, and cropping.
- Transformation
- These filters distort, blur, or stylize an image. They are the most intensive filters, so relatively few of them are available on iOS.
- Transition
- These filters provide a frame of a transition ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.