如何在swift中找到UIImage中单个像素的颜色

我有以下swift代码。如何在swift中找到UIImage中单个像素的颜色

let resolution = [imageView.frame.size.width, imageView.frame.size.height] 

for x in 0...Int(resolution[0]) { 
    for y in 0...Int(resolution[1]) { 
     let coordinate = [x, y] 
     //Find the colour of the pixel here 
    } 
}

我希望能够找到照片中每个像素显示的颜色。有没有办法修改我已经放置的代码“//在此查找像素的颜色”，以便在常量坐标所代表的坐标处打印像素的RGB值？

来源

2015-04-23 Matt Spoon

参考此答案http://stackoverflow.com/questions/3284185/get-pixel-color-of-uiimage –

你可以尝试以下方法：

var pixel : [UInt8] = [0, 0, 0, 0] 
var colorSpace = CGColorSpaceCreateDeviceRGB() 
let bitmapInfo = CGBitmapInfo(CGImageAlphaInfo.PremultipliedLast.rawValue) 
let context = CGBitmapContextCreate(UnsafeMutablePointer(pixel), 1, 1, 8, 4, colorSpace, bitmapInfo)

希望这有助于！

来源

2015-04-23 04:47:28 Horray

添加到@ Horray的答案，要获得颜色值，你必须再执行两行。只要检查该实现，

var pixel : [UInt8] = [0, 0, 0, 0] 
var colorSpace = CGColorSpaceCreateDeviceRGB() 
let bitmapInfo = CGBitmapInfo(CGImageAlphaInfo.PremultipliedLast.rawValue) 
let context = CGBitmapContextCreate(UnsafeMutablePointer(pixel), 1, 1, 8, 4, colorSpace, bitmapInfo) 

// Translate the context your required point(x,y) 
CGContextTranslateCTM(context, -x, -y); 
yourImageView.layer.renderInContext(context) 

NSLog("pixel: %d %d %d %d", pixel[0], pixel[1], pixel[2], pixel[3]); 

let redColor : Float = Float(pixel[0])/255.0 
let greenColor : Float = Float(pixel[1])/255.0 
let blueColor: Float = Float(pixel[2])/255.0 
let colorAlpha: Float = Float(pixel[3])/255.0 

// Create UIColor Object  
var color : UIColor! = UIColor(red: CGFloat(redColor), green: CGFloat(greenColor), blue: CGFloat(blueColor), alpha: CGFloat(colorAlpha))

来源

2015-04-23 05:31:37

您可以通过'X，y'访问像素上的表现拯救而不是先画 –

如何在swift中找到UIImage中单个像素的颜色

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