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    <p>Using <code>CGImageDestination</code> and passing <code>kUTTypePNG</code> is the correct approach. Here's a quick snippet:</p> <pre><code>@import MobileCoreServices; // or `@import CoreServices;` on Mac @import ImageIO; BOOL CGImageWriteToFile(CGImageRef image, NSString *path) { CFURLRef url = (__bridge CFURLRef)[NSURL fileURLWithPath:path]; CGImageDestinationRef destination = CGImageDestinationCreateWithURL(url, kUTTypePNG, 1, NULL); if (!destination) { NSLog(@"Failed to create CGImageDestination for %@", path); return NO; } CGImageDestinationAddImage(destination, image, nil); if (!CGImageDestinationFinalize(destination)) { NSLog(@"Failed to write image to %@", path); CFRelease(destination); return NO; } CFRelease(destination); return YES; } </code></pre> <p>You'll need to add <code>ImageIO</code> and <code>CoreServices</code> (or <code>MobileCoreServices</code> on iOS) to your project and include the headers.</p> <hr> <p>If you're on iOS and don't need a solution that works on Mac too, you can use a simpler approach:</p> <pre><code>// `image` is a CGImageRef // `path` is a NSString with the path to where you want to save it [UIImagePNGRepresentation([UIImage imageWithCGImage:image]) writeToFile:path atomically:YES]; </code></pre> <p><strong>In my tests, the ImageIO approach was about 10% faster than the UIImage approach</strong> on my iPhone 5s. In the simulator, the UIImage approach was faster. It's probably worth testing each for your particular situation on the device if you're really concerned with performance.</p>
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