Question

I’m running several CoreImage filters on an image from device’s camera, and have run into unexpected troubles saving the result to Camera Roll. The result of my image manipulations is a CIImage and the data types I can save into ALAssetsLibrary are either CGImageRef or NSData (via writeImageToSavedPhotosAlbum:metadata:completionBlock: and writeImageDataToSavedPhotosAlbum:metadata:completionBlock: respectively).

Seems like a trivial task, but I cannot find a working way to convert my CIImage to a usable data type that can be written to the photo library (with JPEG compression).

Edit: I would like to save image metadata as well, so that rules out some of the simple UIImage saving techniques.

Answer 1

Try this :

-(void)storeImage:(CIImage*)_image
  CGImageRef cgImg = [context createCGImage:_image fromRect:[_image extent]];
  ALAssetsLibrary* library = [[ALAssetsLibrary alloc] init];
  [library writeImageToSavedPhotosAlbum:cgImg 
                               metadata:[_image properties] 
                        completionBlock:^(NSURL *assetURL, NSError *error) {
                          CGImageRelease(cgImg);
                        }];