convert UIImage to CIImage,, but lose every element. position, rotate, scale etc.. i implemented video editor. so i add pan, rotate, pinch gesture event with UIImageVIew. and when i save video, i convert UIImageView to CIImage. but it's lose everything.. please help me...... ==========.        CIFilter *filter = [CIFilter filterWithName:@"CIAdditionCompositing"];       UIImageView *imageView = self.subviews[0];       CIImage *ciImage = [CIImage imageWithCGImage:imageView.image.CGImage];               _playerItem.videoComposition = [AVVideoComposition                       videoCompositionWithAsset:_playerItem.asset                       applyingCIFiltersWithHandler:^(AVAsynchronou sCIImageFilteringRequest *_Nonnull request) { if (filter == nil) {                        } else {                          CIImage *image = request.sourceImage.imageByClampingToExtent;                          [filter setDefaults];                          [filter setValue:image forKey:@"inputBackgroundImage"];                          [filter setValue:ciImage forKey:@"inputImage"];                                                     CIImage *outputImage = [filter.outputImage imageByCroppingToRect:request.sourceImage.extent];                                                     [request finishWithImage:outputImage context:nil];                        }                       }