title: Swift core image apply sharpen to image without CIFilter
body: <p>in core image we can use some filters and adding this filters to sharpen but when I want to apply only sharpen to image we need a filter. How can I use this without using CIFilter.</p>
  
  <p>Here is the code sample for apply sharpen with CIFilter:</p>
  
  <pre><code>    let filter = CIFilter(name: "CIPhotoEffectChrome")
      filter.setValue(beginImage, forKey: kCIInputImageKey)
      filter.setValue(1, forKey: kCICategorySharpen)
      let outputImage = filter.outputImage
  </code></pre>