Swift-Add a filter effect to a picture (sepia old photo filter, black and white filter)

Core Image is a powerful filter processing framework. In addition to adding various built-in filters directly to the image, it can also accurately modify the vividness, color, exposure, etc. The following two examples demonstrate how to add filters to UIImage.

1. Sepia filter-CISepiaTone
This is a retro yellow photo effect (the above picture is the original picture).
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Expand the UIImage class and add a sepia filter:

import UIKit
 
// --- UIImageFilterExtension.swift ---
extension UIImage
{
    // Sepia retro filter (old photo effect)
    func sepiaTone ()-> UIImage?
    {
        let imageData = UIImagePNGRepresentation (self)
        let inputImage = CoreImage.CIImage (data: imageData!)
        let context = CIContext (options: nil)
        let filter = CIFilter (name: "CISepiaTone")
        filter! .setValue (inputImage, forKey: kCIInputImageKey)
        filter! .setValue (0.8, forKey: "inputIntensity")
        if let outputImage = filter! .outputImage {
            let outImage = context.createCGImage (outputImage, fromRect: outputImage.extent)
            return UIImage (CGImage: outImage)
        }
        return nil
    }
}
Example of use:
1
imageView1.image = UIImage (named: "img2.jpg") ?. sepiaTone ()

2. Black and white filter-CIPhotoEffectNoir
technology sharing

 
Expand the UIImage class and add black and white filters:

import UIKit
 
// --- UIImageFilterExtension.swift ---
extension UIImage
{
    // Black and white effect filter
    func noir ()-> UIImage?
    {
        let imageData = UIImagePNGRepresentation (self)
        let inputImage = CoreImage.CIImage (data: imageData!)
        let context = CIContext (options: nil)
        let filter = CIFilter (name: "CIPhotoEffectNoir")
        filter! .setValue (inputImage, forKey: kCIInputImageKey)
        if let outputImage = filter! .outputImage {
            let outImage = context.createCGImage (outputImage, fromRect: outputImage.extent)
            return UIImage (CGImage: outImage)
        }
        return nil
    }
}
Example of use:
1
imageView1.image = UIImage (named: "img2.jpg") ?. noir ()

Original text from: www.hangge.com Reprint please keep the original text link: http://www.hangge.com/blog/cache/detail_889.html
Swift-Add filter effects to pictures (sepia old photo filter, black and white filter)

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Original address: http://www.cnblogs.com/Free-Thinker/p/4858382.html