ALAsset defaultRepresentation fullResolutionImage - ios

Question

I have an issue with new iOS 7 photo filters feature.
I have a photolibrary in my app. While I showing photo's thumbnails in UICollectionView I receive images with filters and crops already applied. There are two methods that return "ready for use" images:
[asset thumbnail]
[[asset defaultRepresentation] fullScreenImage]
On the contrary, when I want to share fullsize image I receive unchanged photo without any filters:
[[asset defaultRepresentation] fullResolutionImage]
Read image data through getBytes:fromOffset:length:error:
Is it possible to get a fullsize image with filter appropriate applied?

Answer 1

So far I figured out only one way to get what I want. All assets store their modification (like filters, crops and etc) info in the metadata dictionary by the key #"AdjustmentXMP". We're able to interpret this data and apply all filters to the fullResolutionImage like in this SO answer. Here is my complete solution:
...
ALAssetRepresentation *assetRepresentation = [asset defaultRepresentation];
CGImageRef fullResImage = [assetRepresentation fullResolutionImage];
NSString *adjustment = [[assetRepresentation metadata] objectForKey:#"AdjustmentXMP"];
if (adjustment) {
NSData *xmpData = [adjustment dataUsingEncoding:NSUTF8StringEncoding];
CIImage *image = [CIImage imageWithCGImage:fullResImage];
NSError *error = nil;
NSArray *filterArray = [CIFilter filterArrayFromSerializedXMP:xmpData
inputImageExtent:image.extent
error:&error];
CIContext *context = [CIContext contextWithOptions:nil];
if (filterArray && !error) {
for (CIFilter *filter in filterArray) {
[filter setValue:image forKey:kCIInputImageKey];
image = [filter outputImage];
}
fullResImage = [context createCGImage:image fromRect:[image extent]];
}
}
UIImage *result = [UIImage imageWithCGImage:fullResImage
scale:[assetRepresentation scale]
orientation:(UIImageOrientation)[assetRepresentation orientation]];