App crashes while trying to save CIImage after applying CIFilter

Hi,

I hope somebody is able to help me.

I am loading 2 DNG files from the apps documents folder using a CIFilter. That is working fine.

After that I combine these images using a CIMaximumCompositing CIFilter.

When I now try to save the outputImage to a JPEG file, my app crashes with the following output. (On line 19)

Message from debugger: Terminated due to memory issue

When I try to save the 2 loaded DNG files without any processing everything is working fine too.

Here is my Code:

    private func process()
    {
        let raw_path_1   : String   = _current_scan._path.path + "/raw/line_0_0.dng"
        let raw_filter_1 : CIFilter = CIFilter( imageURL: URL(fileURLWithPath: raw_path_1), options: nil )
        let raw_image_1  : CIImage  = raw_filter_1.outputImage!
       
        let raw_path_2   : String   = _current_scan._path.path + "/raw/line_1_0.dng"
        let raw_filter_2 : CIFilter = CIFilter( imageURL: URL(fileURLWithPath: raw_path_2), options: nil )
        let raw_image_2  : CIImage  = raw_filter_2.outputImage!
       
        let result_image : CIImage  = raw_image_1.applyingFilter( "CIMaximumCompositing", parameters: [kCIInputBackgroundImageKey: raw_image_2] )
        let result_path  : String  = _current_scan._path.path + "/raw/line_0.jpeg"
       
        if let colorSpace = CGColorSpace(name: CGColorSpace.sRGB)
        {
            do
            {
                let context = CIContext()
                try context.writeJPEGRepresentation( of: result_image, to: URL(fileURLWithPath: result_path), colorSpace: colorSpace, options: [kCGImageDestinationLossyCompressionQuality as CIImageRepresentationOption : 1.0] )
            }
            catch
            {
                print( error.localizedDescription )
            }
        }
    }

Thank you all!