When a user makes some changes (cropping, red-eye removal, ...) to photos in the built-in **Photos.app** on iOS, the changes are not applied to the `fullResolutionImage` returned by the corresponding `ALAssetRepresentation`. 

However, the changes are applied to the `thumbnail` and the `fullScreenImage` returned by the `ALAssetRepresentation`.
Furthermore, information about the applied changes can be found in the `ALAssetRepresentation`&#39;s   metadata dictionary via the key `@&quot;AdjustmentXMP&quot;`.

I would like to apply these changes to the `fullResolutionImage` myself to preserve consistency. I&#39;ve found out that on **iOS6+** `CIFilter`&#39;s `filterArrayFromSerializedXMP:                              inputImageExtent:error:` can convert this XMP-metadata to an array of `CIFilter`&#39;s:

    ALAssetRepresentation *rep; 
    NSString *xmpString = rep.metadata[@&quot;AdjustmentXMP&quot;];
    NSData *xmpData = [xmpString dataUsingEncoding:NSUTF8StringEncoding];
            
    CIImage *image = [CIImage imageWithCGImage:rep.fullResolutionImage];
            
    NSError *error = nil;
    NSArray *filterArray = [CIFilter filterArrayFromSerializedXMP:xmpData 
                                                 inputImageExtent:image.extent 
                                                            error:&amp;error];
    if (error) {
         NSLog(@&quot;Error during CIFilter creation: %@&quot;, [error localizedDescription]);
    }

    CIContext *context = [CIContext contextWithOptions:nil];
                   
    for (CIFilter *filter in filterArray) {
         [filter setValue:image forKey:kCIInputImageKey];
         image = [filter outputImage];
    }



However, this works only for some filters (cropping, auto-enhance) but not for others like red-eye removal. In these cases, the `CIFilter`s have no visible effect. Therefore, my questions:

 - Is anyone aware of a way to create red-eye removal `CIFilter`? (In a way consistent with the Photos.app. The filter with the key `kCIImageAutoAdjustRedEye` is not enough. E.g., it does not take parameters for the position of the eyes.)
 - Is there a possibility to generate and apply these filters under iOS 5? 

 

All Cifilter Solutions on Gang of Coders

Total of 1 Cifilter Solutions

Interpret XMP-Metadata in ALAssetRepresentation