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    <h2>Accessing image properties, such as image height and width, DPI, EXIF data, etc., via ImageIO</h2> <pre><code>CFURLRef url = CFURLCreateFromFileSystemRepresentation (kCFAllocatorDefault, (const UInt8 *)inputFileName, strlen(inputFileName), false); if (!url) { printf ("* * Bad input file path\n"); } CGImageSourceRef myImageSource; myImageSource = CGImageSourceCreateWithURL(url, NULL); CFDictionaryRef imagePropertiesDictionary; imagePropertiesDictionary = CGImageSourceCopyPropertiesAtIndex(myImageSource,0, NULL); CFNumberRef imageWidth = (CFNumberRef)CFDictionaryGetValue(imagePropertiesDictionary, kCGImagePropertyPixelWidth); CFNumberRef imageHeight = (CFNumberRef)CFDictionaryGetValue(imagePropertiesDictionary, kCGImagePropertyPixelHeight); int w = 0; int h = 0; CFNumberGetValue(imageWidth, kCFNumberIntType, &amp;w); CFNumberGetValue(imageHeight, kCFNumberIntType, &amp;h); CFRelease(imagePropertiesDictionary); CFRelease(myImageSource); printf("Image Width: %d\n",w); printf("Image Height: %d\n",h); </code></pre> <p>( source: <a href="http://developer.apple.com/library/ios/#qa/qa1654/_index.html" rel="noreferrer">http://developer.apple.com/library/ios/#qa/qa1654/_index.html</a> )</p> <pre><code> NSString *myPath = [[NSBundle mainBundle] pathForResource:@"IMG_2733" ofType:@"JPG"]; NSURL *myURL = [NSURL fileURLWithPath:myPath]; CGImageSourceRef mySourceRef = CGImageSourceCreateWithURL((CFURLRef)myURL, NULL); NSDictionary *myMetadata = (NSDictionary *) CGImageSourceCopyPropertiesAtIndex(mySourceRef,0,NULL); NSDictionary *exifDic = [myMetadata objectForKey:(NSString *)kCGImagePropertyExifDictionary]; NSDictionary *tiffDic = [myMetadata objectForKey:(NSString *)kCGImagePropertyTIFFDictionary]; NSLog(@"exifDic properties: %@", myMetadata); //all data float rawShutterSpeed = [[exifDic objectForKey:(NSString *)kCGImagePropertyExifExposureTime] floatValue]; int decShutterSpeed = (1 / rawShutterSpeed); NSLog(@"Camera %@",[tiffDic objectForKey:(NSString *)kCGImagePropertyTIFFModel]); NSLog(@"Focal Length %@mm",[exifDic objectForKey:(NSString *)kCGImagePropertyExifFocalLength]); NSLog(@"Shutter Speed %@", [NSString stringWithFormat:@"1/%d", decShutterSpeed]); NSLog(@"Aperture f/%@",[exifDic objectForKey:(NSString *)kCGImagePropertyExifFNumber]); NSNumber *ExifISOSpeed = [[exifDic objectForKey:(NSString*)kCGImagePropertyExifISOSpeedRatings] objectAtIndex:0]; NSLog(@"ISO %i",[ExifISOSpeed integerValue]); NSLog(@"Taken %@",[exifDic objectForKey:(NSString*)kCGImagePropertyExifDateTimeDigitized]); </code></pre> <p>( source: <a href="http://blog.depicus.com/index.php/2011/05/07/getting-exif-data-from-images-on-ios/" rel="noreferrer">http://blog.depicus.com/index.php/2011/05/07/getting-exif-data-from-images-on-ios/</a> )</p> <h2>Accessing EXIF properties via the open source (but outdated) iphone-exif library</h2> <pre><code>NSData* theImageData = UIImageRepresentation(anImage,1.0); EXFJpeg* jpegScanner = [[EXFJpeg alloc] init]; [jpegScanner scanImageData: theImageData]; EXFMetaData* exifData = jpegScanner.exifMetaData; EXFJFIF* jfif = jpegScanner.jfif; id tagValue = [exifData tagValue: aTagId]; </code></pre> <p>( source: <a href="http://code.google.com/p/iphone-exif/" rel="noreferrer">http://code.google.com/p/iphone-exif/</a> )</p>
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