小编and*_*eas的帖子

当用户对iOS上内置的Photos.app中的照片进行一些更改(裁剪,消除红眼......等)时,更改不会应用于fullResolutionImage相应的返回ALAssetRepresentation.

但是,更改将应用​​于thumbnail和fullScreenImage返回的ALAssetRepresentation.此外,有关应用更改的信息可以ALAssetRepresentation通过密钥在元数据字典中找到@"AdjustmentXMP".

我想将这些更改应用于fullResolutionImage自己以保持一致性.我发现,在iOS6的+ CIFilter的filterArrayFromSerializedXMP: inputImageExtent:error:可以在此XMP元数据转换成数组CIFilter的:

ALAssetRepresentation *rep; 
NSString *xmpString = rep.metadata[@"AdjustmentXMP"];
NSData *xmpData = [xmpString dataUsingEncoding:NSUTF8StringEncoding];

CIImage *image = [CIImage imageWithCGImage:rep.fullResolutionImage];

NSError *error = nil;
NSArray *filterArray = [CIFilter filterArrayFromSerializedXMP:xmpData 
                                             inputImageExtent:image.extent 
                                                        error:&error];
if (error) {
     NSLog(@"Error during CIFilter creation: %@", [error localizedDescription]);
}

CIContext *context = [CIContext contextWithOptions:nil];

for (CIFilter *filter in filterArray) {
     [filter setValue:image …