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    <p>Ok, finally I solved problem:</p> <p>Instead of getting image directly by </p> <pre><code>asset.defaultRepresentation.fullScreenImage </code></pre> <p>I use the method from Apple's Exemple <a href="http://developer.apple.com/library/ios/#samplecode/PhotosByLocation/Introduction/Intro.html#//apple_ref/doc/uid/DTS40010136">PhotosByLocation</a> (code below) to get the image in BG thread. That works great, no more lag when scroll. <strong>But I am still confused, I don't know exactly why. So I appreciate if someone can explain it to me.</strong></p> <pre><code>- (UIImage *)fullSizeImageForAssetRepresentation:(ALAssetRepresentation *)assetRepresentation { UIImage *result = nil; NSData *data = nil; uint8_t *buffer = (uint8_t *)malloc(sizeof(uint8_t)*[assetRepresentation size]); if (buffer != NULL) { NSError *error = nil; NSUInteger bytesRead = [assetRepresentation getBytes:buffer fromOffset:0 length:[assetRepresentation size] error:&amp;error]; data = [NSData dataWithBytes:buffer length:bytesRead]; free(buffer); } if ([data length]) { CGImageSourceRef sourceRef = CGImageSourceCreateWithData((__bridge CFDataRef)data, nil); NSMutableDictionary *options = [NSMutableDictionary dictionary]; [options setObject:(id)kCFBooleanTrue forKey:(id)kCGImageSourceShouldAllowFloat]; [options setObject:(id)kCFBooleanTrue forKey:(id)kCGImageSourceCreateThumbnailFromImageAlways]; [options setObject:(id)[NSNumber numberWithFloat:640.0f] forKey:(id)kCGImageSourceThumbnailMaxPixelSize]; //[options setObject:(id)kCFBooleanTrue forKey:(id)kCGImageSourceCreateThumbnailWithTransform]; CGImageRef imageRef = CGImageSourceCreateThumbnailAtIndex(sourceRef, 0, (__bridge CFDictionaryRef)options); if (imageRef) { result = [UIImage imageWithCGImage:imageRef scale:[assetRepresentation scale] orientation:(UIImageOrientation)[assetRepresentation orientation]]; CGImageRelease(imageRef); } if (sourceRef) CFRelease(sourceRef); } return result; } </code></pre>
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