Resizing Image using Core Image

resize-ci.swift

extension UIImage {
    func resizeCI(size:CGSize) -> UIImage? {
        let scale = (Double)(size.width) / (Double)(self.size.width)
            let image = UIKit.CIImage(CGImage:self.CGImage!)
            
            let filter = CIFilter(name: "CILanczosScaleTransform")!
            filter.setValue(image, forKey: kCIInputImageKey)
            filter.setValue(NSNumber(double:scale), forKey: kCIInputScaleKey)
            filter.setValue(1.0, forKey:kCIInputAspectRatioKey)
            let outputImage = filter.valueForKey(kCIOutputImageKey) as! UIKit.CIImage
            
            let context = CIContext(options: [kCIContextUseSoftwareRenderer: false])
            let resizedImage = UIImage(CGImage: context.createCGImage(outputImage, fromRect: outputImage.extent))
            return resizedImage
    }
}

Its adding a white line after resize, like we have an image of 1599_1600 and i want to resize it to 1023_1024
the result image after saving to camera roll showing a white line.