Interpreting XMP metadata in Alassetrepresentation

When the user makes certain changes (crop, remove red-eye, ... ), on the built-in Photos.app iOS, these changes will not be applied to the

Fullresolutionimage

Returned by

Alassetrepresentation

Photo.

However, these changes are applied to the

Thumbnail

and by

Fullscreenimage

Returned by

Alassetrepresentation

.
In addition, change information about the app can be

Alassetrepresentation

Meta-data dictionary via key

@ "ADJUSTMENTXMP"

Found.

I want these changes to be applied to

Fullresolutionimage

Maintain consistency. I found in IOS6 's +

Cifilter

Of

FilterArrayFromSerializedXMP:inputImageExtent:error:

This XMP metadata can be converted to the

Cifilter

Array of:

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 Forkey:kciinputimagekey];
Image = [Filter outputimage];
}

However, this applies only to certain filters (clipping, auto-boost), but not to others like removing red-eye. In these cases,

Cifilter

S has no visible effect. So, my question:

• There's no one knows the way to create red-eye removal

  Cifilter

  ？ (in a manner consistent with Photos.app, with the key

  Kciimageautoadjustredeye

  The filter is not enough. For example, it does not take into account the positional parameters of the eye.)

• Is there a possible way to generate and apply these filters under iOS 5?

Answer Rank--0

alassetrepresentation* representation = [[self assetatindex:index] defaultrepresentation];
Create a buffer to hold the data for the asset ' s image
uint8_t *buffer = (byte*) malloc (representation.size);//Copy the data from the asset into the buffer
Nsuinteger length = [representation Getbytes:buffer fromoffset:0.0 Length:representation.size Error:nil];

if (length==0) return nil;

Convert the buffer into a NSData object, free the buffer after

NSData *adata = [[NSData alloc] Initwithbytesnocopy:buffer length:representation.size Freewhendone:yes];

Setup a dictionary with a UTI hint. The UTI hint identifies the type of image we are dealing with (ie. a jpeg, PNG, or a possible RAW file)

Specify the source hint

nsdictionary* sourceoptionsdict = [Nsdictionary Dictionarywithobjectsandkeys:

(ID) [Representation UTI], Kcgimagesourcetypeidentifierhint,

NIL];

Create a cgimagesource with the NSData. A image source can contain X number of thumbnails and full images.

Cgimagesourceref sourceref = Cgimagesourcecreatewithdata ((cfdataref) Adata, (cfdictionaryref) sourceOptionsDict);

[Adata release];

Cfdictionaryref imagepropertiesdictionary;

Get a copy of the image properties from the Cgimagesourceref

Imagepropertiesdictionary = Cgimagesourcecopypropertiesatindex (sourceref,0, NULL);

Cfnumberref imagewidth = (cfnumberref) cfdictionarygetvalue (imagepropertiesdictionary, kCGImagePropertyPixelWidth);

Cfnumberref imageheight = (cfnumberref) cfdictionarygetvalue (Imagepropertiesdictionary, KCGImagePropertyPixelHeight );

int w = 0;

int h = 0;

Cfnumbergetvalue (ImageWidth, Kcfnumberinttype, &w);

Cfnumbergetvalue (ImageHeight, Kcfnumberinttype, &h);

Cleanup memory

Cfrelease (imagepropertiesdictionary);

Interpreting XMP metadata in Alassetrepresentation