快速改变图像的色调 [英] changing the tint of the image in swift
问题描述
我是swift的新手,并试图实现这一目标,
此图片为
I am new to swift and trying to achieve this essentially, This image to
此图片 - >
I我使用此代码从这里更改图像上的色调,但没有得到所需的输出
I am using this code from here to change the tint on image but do not get the desired output
func tint(image: UIImage, color: UIColor) -> UIImage
{
let ciImage = CIImage(image: image)
let filter = CIFilter(name: "CIMultiplyCompositing")
let colorFilter = CIFilter(name: "CIConstantColorGenerator")
let ciColor = CIColor(color: color)
colorFilter.setValue(ciColor, forKey: kCIInputColorKey)
let colorImage = colorFilter.outputImage
filter.setValue(colorImage, forKey: kCIInputImageKey)
filter.setValue(ciImage, forKey: kCIInputBackgroundImageKey)
return UIImage(CIImage: filter.outputImage)!
}
如果这是一个noob问题,请道歉。我能够在javascript中轻松完成此操作,但不能在swift中轻松完成。
If this is a noob question, apologies. I was able to do this easily in javascript but not in swift.
推荐答案
您可以通过以下方式使用它。首先,您使用的UIImage扩展需要一些更新。
你可以复制下面的代码为Swift 3
hi you can use it the following way. First the UIImage Extension that you used needs some updates. you can copy the code below for Swift 3
extension UIImage{
func tint(color: UIColor, blendMode: CGBlendMode) -> UIImage
{
let drawRect = CGRect(x: 0,y: 0,width: size.width,height: size.height)
UIGraphicsBeginImageContextWithOptions(size, false, scale)
color.setFill()
UIRectFill(drawRect)
draw(in: drawRect, blendMode: blendMode, alpha: 1.0)
let tintedImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return tintedImage!
}
}
然后在viewDidLoad中使用图片
例如我使用IBOutlet中的图像imageWood
Then in your viewDidLoad where you are using the image for example i used the image from IBOutlet imageWood
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.imageWood.image = self.imageWood.image?.tint(color: UIColor.green, blendMode: .saturation)
}
您必须使用适当的颜色和图像
You will have to use the appropriate color and the images
其他扩展我发现
extension UIImage {
// colorize image with given tint color
// this is similar to Photoshop's "Color" layer blend mode
// this is perfect for non-greyscale source images, and images that have both highlights and shadows that should be preserved
// white will stay white and black will stay black as the lightness of the image is preserved
func tint(_ tintColor: UIColor) -> UIImage {
return modifiedImage { context, rect in
// draw black background - workaround to preserve color of partially transparent pixels
context.setBlendMode(.normal)
UIColor.black.setFill()
context.fill(rect)
// draw original image
context.setBlendMode(.normal)
context.draw(self.cgImage!, in: rect)
// tint image (loosing alpha) - the luminosity of the original image is preserved
context.setBlendMode(.color)
tintColor.setFill()
context.fill(rect)
// mask by alpha values of original image
context.setBlendMode(.destinationIn)
context.draw(self.cgImage!, in: rect)
}
}
// fills the alpha channel of the source image with the given color
// any color information except to the alpha channel will be ignored
func fillAlpha(_ fillColor: UIColor) -> UIImage {
return modifiedImage { context, rect in
// draw tint color
context.setBlendMode(.normal)
fillColor.setFill()
context.fill(rect)
// mask by alpha values of original image
context.setBlendMode(.destinationIn)
context.draw(self.cgImage!, in: rect)
}
}
fileprivate func modifiedImage(_ draw: (CGContext, CGRect) -> ()) -> UIImage {
// using scale correctly preserves retina images
UIGraphicsBeginImageContextWithOptions(size, false, scale)
let context: CGContext! = UIGraphicsGetCurrentContext()
assert(context != nil)
// correctly rotate image
context.translateBy(x: 0, y: size.height);
context.scaleBy(x: 1.0, y: -1.0);
let rect = CGRect(x: 0.0, y: 0.0, width: size.width, height: size.height)
draw(context, rect)
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return image!
}
}
像这样使用
self.imageWood.image = self.imageWood.image?.tint(UIColor.purple.withAlphaComponent(1))
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