Reputation: 2840
I have the following swift code.
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
}
}
I want to be able to find the colour being displayed by each individual pixel in the photo. Is there a way to modify the code where I have put "//Find the colour of the pixel here" to get it to print the RGB value of the pixel at the coordinate represented by the constant coordinate?
Upvotes: 4
Views: 3211
Reputation: 3905
Adding to @Horray's answer, to get the color values you have to execute two more lines. Just check this implementation,
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))
Upvotes: 3
Reputation: 693
You can try the following:
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)
Hope this helps!!
Upvotes: 2