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The iPhone™ Developer’s Cookbook: Building Applications with the iPhone 3.0 SDK, Second Edition by Erica Sadun

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7. Working with Images

On the iPhone, images and views play two distinct roles. Unlike views, images have no onscreen presence. Although views can use and display images, they are not themselves images, not even UIImageView objects. This chapter introduces images, specifically the UIImage class, and teaches you all the basic know-how you need for working with iPhone images. You learn how to load, store, and modify image data in your applications. You see how to add images to views and how to convert views into images. You discover how to process image data to create special effects, how to access images on a byte-by-byte basis, and how to take photos with your iPhone’s built-in camera.

Recipe: Finding and Loading Images

iPhone images are generally ...

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