let attrs = [kCVPixelBufferCGImageCompatibilityKey: kCFBooleanTrue, kCVPixelBufferCGBitmapContextCompatibilityKey: kCFBooleanTrue] as CFDictionary
    var pixelBuffer : CVPixelBuffer?
    let status = CVPixelBufferCreate(kCFAllocatorDefault, Int(image.size.width), Int(image.size.height), kCVPixelFormatType_32BGRA, attrs, &pixelBuffer)
    guard (status == kCVReturnSuccess) else {
        return nil
    }
    let context = CIContext()
    context.render(CIImage(image: image)!, to: pixelBuffer!)

    CVPixelBufferLockBaseAddress(pixelBuffer!, CVPixelBufferLockFlags(rawValue: 0))
    let bytesPerRow = CVPixelBufferGetBytesPerRow(pixelBuffer!)
    let baseAddress = CVPixelBufferGetBaseAddress(pixelBuffer!)
    let buffer = baseAddress!.assumingMemoryBound(to: UInt8.self)
    print("bytesPerRow ", bytesPerRow)
    for cy in 0..<Int(image.size.height){
        for cx in 0..<Int(image.size.width){
            let index = cx * 4 + cy * bytesPerRow
            let a0 = buffer[index]
            let r0 = buffer[index+1]
            let g0 = buffer[index+2]
            let b0 = buffer[index+3]
        }
    }

CVPixelBufferUnlockBaseAddress(pixelBuffer!, CVPixelBufferLockFlags(rawValue: 0))