Read non-standard properties from an image in objective C

Question

I'm using this code (Writing image metadata (EXIF/TIFF/IPTC) to image file in OS X) to read EXIF/TIFF/IPTC data from image files. It's working great, but I would also need to copy the clipping path over. It's saved to a non standard index called "Photoshop" (just like the Others are called Iptc and similar).

I can't figure out how to access this information to copy it over to a newly created NSImage. The method in the link does not seem to access any non-standard informations. Any help appreciated. Thanks

EDIT ----

Here is a sample image: http://www.mad-sharky.com/clipping_path.jpg

This one contains a clipping path, it can be verified usign this tool: http://regex.info/exif.cgi you can see the "Photoshop" section. That part contains all the data I am missing with the code I am using. (Code is the same as the link above)

Answer 1

I only have an old .psd file which does not have a clipping path. But does have layers.

This quick bit of example code uses the Photoshop image properties. kCGImageProperty8BIMDictionary

 NSURL *imageFileURL = [NSURL fileURLWithPath:@"/users/username/foo.psd"];
    CGImageSourceRef imageSource = CGImageSourceCreateWithURL((__bridge CFURLRef)imageFileURL, NULL);

    NSDictionary *properties = (__bridge_transfer NSDictionary *)CGImageSourceCopyPropertiesAtIndex(imageSource, 0,
                                                                                                    NULL);

    NSDictionary *bim = properties[(__bridge id)kCGImageProperty8BIMDictionary];

     NSLog(@"bim %@",bim);

      CFRelease(imageSource);

In my Image I have some image layers:

The NSLog from the code above returns

imageRead[11220:452087] bim { LayerNames = ( "Layer 0", "Layer 5", "Layer 6", "Layer 4", "Layer 3", "Layer 2", "Layer 1" ); Version = 1; }

If I wanted to know all the keys I could use:

id allKeys = [bim allKeys];
     NSLog(@"allKeys %@",allKeys);

And get:

imageRead[11531:463848] allKeys ( Version, LayerNames )

I could then use:

id LayerNames = [bim objectForKey:@"LayerNames"];
 NSLog(@"LayerNames %@",LayerNames);

to get :

imageRead[11563:465657] LayerNames ( "Layer 0", "Layer 5", "Layer 6", "Layer 4", "Layer 3", "Layer 2", "Layer 1" )

Or

valueForKey:, allValues

I cannot test if a clipping path would come back unfortunately