filterchain.swift

let output = self.beginImage
    .applyingFilter("CISepiaTone", parameters: [
        kCIInputIntensityKey: 0.5
    ])
    .applyingFilter("CICMYKHalftone", parameters: [
        kCIInputWidthKey: 35
    ])

if let cgimg = context.createCGImage(output, from: output.extent) {
    let processedImage = UIImage(cgImage: cgimg)
    self.imgView.image = processedImage
}