ColorMatrix 的亮度、饱和度和对比度 Swift
Brightness, saturation and contrast with ColorMatrix in Swift
我正在尝试在 Swift 中重新编写我的 Android 应用程序以在 iOS 中启动,但我遇到了瓶颈...
Android 应用程序是关于基于 ColorMatrix 求和的图像处理......即下一个矩阵来制作灰度图像:
float[] bwMatrix = {
0f, 1f, 0f, 0f, 0f,
0f, 1f, 0f, 0f, 0f,
0f, 1f, 0f, 0f, 0f,
0f, 0f, 0f, 1f, 0f,
0f, 0f, 0f, 0f, 1f};
现在,尝试应用与 Swift 相同的概念,我的代码如下:
import UIKit
dynamic var colorMatrix : CIFilter?
class editionViewController: UIViewController {
@IBOutlet weak var editionImageView: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
let fileManager = FileManager.default
let imagePath = (self.getDirectoryPath() as NSURL).appendingPathComponent("editionImg0.png")
let urlString: String = imagePath!.absoluteString
if fileManager.fileExists(atPath: urlString) {
let originalImage = UIImage (contentsOfFile: urlString)
let liaImage = originalImage?.liaFilter()
editionImageView.image = liaImage
}
}
func getDirectoryPath() -> NSURL {
let path = (NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as NSString).appendingPathComponent("tempImages")
let url = NSURL (string: path)
return url!
}
}
extension UIImage {
//Lia filter
func liaFilter() -> UIImage? {
let inImage = CIImage(image: self)
colorMatrix?.setDefaults()
colorMatrix?.setValue(inImage, forKey: "inputImage")
colorMatrix?.setValue(CIVector(x: 0, y: 1, z: 0, w: 0), forKey: "inputRvector")
colorMatrix?.setValue(CIVector(x: 0, y: 1, z: 0, w: 0), forKey: "inputGvector")
colorMatrix?.setValue(CIVector(x: 0, y: 1, z: 0, w: 0), forKey: "inputBvector")
colorMatrix?.setValue(CIVector(x: 0, y: 0, z: 0, w: 1), forKey: "inputAvector")
let outCIImage = (colorMatrix?.outputImage)
return UIImage (ciImage: outCIImage!) //HERE is the crash
/*
if let outCIImage = colorMatrix?.outputImage {
return UIImage (ciImage: outCIImage)
}
return nil
*/
}
}
但应用程序总是崩溃并出现下一个错误:
提前致谢!
colorMatrix 属性 是 nil
因为您从未正确初始化它。
从您的控制器中删除 dynamic var colorMatrix: CIFilter?
并使用下面的代码。
class editionViewController: UIViewController {
@IBOutlet weak var editionImageView: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
if let image = UIImage(named: "myImage.png") {
editionImageView.image = image.liaFilter()
}
}
}
extension UIImage {
//Lia filter
func liaFilter() -> UIImage {
let inImage = CIImage(image: self)
let rgbVector = CIVector(x: 0, y: 1, z: 0, w: 0)
let aVector = CIVector(x: 0, y: 0, z: 0, w: 1)
dynamic let colorMatrix = CIFilter(name: "CIColorMatrix")
if colorMatrix != nil {
colorMatrix?.setDefaults()
colorMatrix?.setValue(inImage, forKey: kCIInputImageKey)
colorMatrix?.setValue(rgbVector, forKey: "inputRVector")
colorMatrix?.setValue(rgbVector, forKey: "inputGVector")
colorMatrix?.setValue(rgbVector, forKey: "inputBVector")
colorMatrix?.setValue(aVector, forKey: "inputAVector")
if let output = colorMatrix?.outputImage, let cgImage = CIContext().createCGImage(output, from: output.extent) {
return UIImage(cgImage: cgImage)
}
}
return self
}
}
我修复了你的 UIImage 扩展方法。
我将 CIFilter 的初始化程序放在扩展方法中,这样您就不必为它保留引用。
希望对您有所帮助。
我正在尝试在 Swift 中重新编写我的 Android 应用程序以在 iOS 中启动,但我遇到了瓶颈...
Android 应用程序是关于基于 ColorMatrix 求和的图像处理......即下一个矩阵来制作灰度图像:
float[] bwMatrix = {
0f, 1f, 0f, 0f, 0f,
0f, 1f, 0f, 0f, 0f,
0f, 1f, 0f, 0f, 0f,
0f, 0f, 0f, 1f, 0f,
0f, 0f, 0f, 0f, 1f};
现在,尝试应用与 Swift 相同的概念,我的代码如下:
import UIKit
dynamic var colorMatrix : CIFilter?
class editionViewController: UIViewController {
@IBOutlet weak var editionImageView: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
let fileManager = FileManager.default
let imagePath = (self.getDirectoryPath() as NSURL).appendingPathComponent("editionImg0.png")
let urlString: String = imagePath!.absoluteString
if fileManager.fileExists(atPath: urlString) {
let originalImage = UIImage (contentsOfFile: urlString)
let liaImage = originalImage?.liaFilter()
editionImageView.image = liaImage
}
}
func getDirectoryPath() -> NSURL {
let path = (NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as NSString).appendingPathComponent("tempImages")
let url = NSURL (string: path)
return url!
}
}
extension UIImage {
//Lia filter
func liaFilter() -> UIImage? {
let inImage = CIImage(image: self)
colorMatrix?.setDefaults()
colorMatrix?.setValue(inImage, forKey: "inputImage")
colorMatrix?.setValue(CIVector(x: 0, y: 1, z: 0, w: 0), forKey: "inputRvector")
colorMatrix?.setValue(CIVector(x: 0, y: 1, z: 0, w: 0), forKey: "inputGvector")
colorMatrix?.setValue(CIVector(x: 0, y: 1, z: 0, w: 0), forKey: "inputBvector")
colorMatrix?.setValue(CIVector(x: 0, y: 0, z: 0, w: 1), forKey: "inputAvector")
let outCIImage = (colorMatrix?.outputImage)
return UIImage (ciImage: outCIImage!) //HERE is the crash
/*
if let outCIImage = colorMatrix?.outputImage {
return UIImage (ciImage: outCIImage)
}
return nil
*/
}
}
但应用程序总是崩溃并出现下一个错误:
提前致谢!
colorMatrix 属性 是 nil
因为您从未正确初始化它。
从您的控制器中删除 dynamic var colorMatrix: CIFilter?
并使用下面的代码。
class editionViewController: UIViewController {
@IBOutlet weak var editionImageView: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
if let image = UIImage(named: "myImage.png") {
editionImageView.image = image.liaFilter()
}
}
}
extension UIImage {
//Lia filter
func liaFilter() -> UIImage {
let inImage = CIImage(image: self)
let rgbVector = CIVector(x: 0, y: 1, z: 0, w: 0)
let aVector = CIVector(x: 0, y: 0, z: 0, w: 1)
dynamic let colorMatrix = CIFilter(name: "CIColorMatrix")
if colorMatrix != nil {
colorMatrix?.setDefaults()
colorMatrix?.setValue(inImage, forKey: kCIInputImageKey)
colorMatrix?.setValue(rgbVector, forKey: "inputRVector")
colorMatrix?.setValue(rgbVector, forKey: "inputGVector")
colorMatrix?.setValue(rgbVector, forKey: "inputBVector")
colorMatrix?.setValue(aVector, forKey: "inputAVector")
if let output = colorMatrix?.outputImage, let cgImage = CIContext().createCGImage(output, from: output.extent) {
return UIImage(cgImage: cgImage)
}
}
return self
}
}
我修复了你的 UIImage 扩展方法。
我将 CIFilter 的初始化程序放在扩展方法中,这样您就不必为它保留引用。
希望对您有所帮助。