iOS-UIImageView-如何处理UIImage图像方向

80

是否可以设置UIImageView处理图像方向？当我将UIImageView图像的方向设置为RIGHT（它是相机胶卷中的照片）时，图像会向右旋转，但是我想以拍摄时的正确方向显示它。

我知道我可以旋转图像数据，但是可以做得更优雅吗？

ios  uiimageview  uiimage  orientation 
— 马丁·皮尔奇（Martin Pilch）
source

Answers:

142

如果我理解，您想要做的就是忽略UIImage的方向？如果是这样，那么您可以这样做：

UIImage *originalImage = [... whatever ...];

UIImage *imageToDisplay =
     [UIImage imageWithCGImage:[originalImage CGImage]
              scale:[originalImage scale]
              orientation: UIImageOrientationUp];

因此，您要创建一个具有与原始像素相同的像素数据的新UIImage（通过其CGImage属性引用），但是要指定一个不会旋转数据的方向。

— 汤米
source
4
顺便说一句，我怎样才能真正旋转图像数据？
— 王亮
7
我想您会CGContext使用CGBitmapContextCreate（或使用UIGraphicsBeginImageContext速记）创建适当大小的图片，使用CGContextRotateCTM来设置旋转角度，drawInRect:在UIImage或上CGContextDrawImage使用图片的CGImage属性，然后使用UIGraphicsGetImageFromCurrentImageContext（然后在）将上下文转换为图片，UIGraphicsEndImageContext如果您使用UIKit创建上下文，或者CGBitmapContextCreateImage如果您坚持使用Core Graphics。UIKit不是非常线程安全的，但是代码会更整洁。
— 汤米
当我将图像放入ImageView时，我无法使用它...即使我创建的图像具有镜像方向，它也只能以其原始方向显示图像：[UIImage imageWithCGImage：image.CGImage scale：image .scale orientation：UIImageOrientationUpMirrored] ... OP询问要使用ImageView，但我无法在ImageView中使用此解决方案...
— Ethan G
1
适用于PNG，但不适用于HEIC。
— DawnSong
50

您可以完全避免手工做的转换和缩放自己，在这个答案AN0的建议在这里：

- (UIImage *)normalizedImage {
    if (self.imageOrientation == UIImageOrientationUp) return self; 

    UIGraphicsBeginImageContextWithOptions(self.size, NO, self.scale);
    [self drawInRect:(CGRect){0, 0, self.size}];
    UIImage *normalizedImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return normalizedImage;
}

UIImage方法size和drawInRect的文档明确声明它们考虑了方向。

— 用户名
source
1
这可以节省生命。
— Quark
我在哪里粘贴呢？
— Frostmourne
25

我在这里将Anomie的答案中的代码（上面粘贴了suvish valsan的代码）转换为Swift：

func fixOrientation() -> UIImage {
    if self.imageOrientation == UIImageOrientation.Up {
        return self
    }

    var transform = CGAffineTransformIdentity

    switch self.imageOrientation {
    case .Down, .DownMirrored:
        transform = CGAffineTransformTranslate(transform, self.size.width, self.size.height)
        transform = CGAffineTransformRotate(transform, CGFloat(M_PI));

    case .Left, .LeftMirrored:
        transform = CGAffineTransformTranslate(transform, self.size.width, 0);
        transform = CGAffineTransformRotate(transform, CGFloat(M_PI_2));

    case .Right, .RightMirrored:
        transform = CGAffineTransformTranslate(transform, 0, self.size.height);
        transform = CGAffineTransformRotate(transform, CGFloat(-M_PI_2));

    case .Up, .UpMirrored:
        break
    }

    switch self.imageOrientation {

    case .UpMirrored, .DownMirrored:
        transform = CGAffineTransformTranslate(transform, self.size.width, 0)
        transform = CGAffineTransformScale(transform, -1, 1)

    case .LeftMirrored, .RightMirrored:
        transform = CGAffineTransformTranslate(transform, self.size.height, 0)
        transform = CGAffineTransformScale(transform, -1, 1);

    default:
        break;
    }

    // Now we draw the underlying CGImage into a new context, applying the transform
    // calculated above.
    let ctx = CGBitmapContextCreate(
        nil,
        Int(self.size.width),
        Int(self.size.height),
        CGImageGetBitsPerComponent(self.CGImage),
        0,
        CGImageGetColorSpace(self.CGImage),
        UInt32(CGImageGetBitmapInfo(self.CGImage).rawValue)
    )

    CGContextConcatCTM(ctx, transform);

    switch self.imageOrientation {
    case .Left, .LeftMirrored, .Right, .RightMirrored:
        // Grr...
        CGContextDrawImage(ctx, CGRectMake(0, 0, self.size.height,self.size.width), self.CGImage);

    default:
        CGContextDrawImage(ctx, CGRectMake(0, 0, self.size.width,self.size.height), self.CGImage);
        break;
    }

    // And now we just create a new UIImage from the drawing context
    let cgimg = CGBitmapContextCreateImage(ctx)

    let img = UIImage(CGImage: cgimg!)

    return img;
}

（我更换了参数的所有occurenciesimage用self，因为我的代码是一个扩展UIImage）。

编辑： Swift 3版本。

该方法返回一个可选参数，因为许多中间调用可能会失败，并且我不喜欢使用!。

func fixOrientation() -> UIImage? {

    guard let cgImage = self.cgImage else {
        return nil
    }

    if self.imageOrientation == UIImageOrientation.up {
        return self
    }

    let width  = self.size.width
    let height = self.size.height

    var transform = CGAffineTransform.identity

    switch self.imageOrientation {
    case .down, .downMirrored:
        transform = transform.translatedBy(x: width, y: height)
        transform = transform.rotated(by: CGFloat.pi)

    case .left, .leftMirrored:
        transform = transform.translatedBy(x: width, y: 0)
        transform = transform.rotated(by: 0.5*CGFloat.pi)

    case .right, .rightMirrored:
        transform = transform.translatedBy(x: 0, y: height)
        transform = transform.rotated(by: -0.5*CGFloat.pi)

    case .up, .upMirrored:
        break
    }

    switch self.imageOrientation {
    case .upMirrored, .downMirrored:
        transform = transform.translatedBy(x: width, y: 0)
        transform = transform.scaledBy(x: -1, y: 1)

    case .leftMirrored, .rightMirrored:
        transform = transform.translatedBy(x: height, y: 0)
        transform = transform.scaledBy(x: -1, y: 1)

    default:
        break;
    }

    // Now we draw the underlying CGImage into a new context, applying the transform
    // calculated above.
    guard let colorSpace = cgImage.colorSpace else {
        return nil
    }

    guard let context = CGContext(
        data: nil,
        width: Int(width),
        height: Int(height),
        bitsPerComponent: cgImage.bitsPerComponent,
        bytesPerRow: 0,
        space: colorSpace,
        bitmapInfo: UInt32(cgImage.bitmapInfo.rawValue)
        ) else {
            return nil
    }

    context.concatenate(transform);

    switch self.imageOrientation {

    case .left, .leftMirrored, .right, .rightMirrored:
        // Grr...
        context.draw(cgImage, in: CGRect(x: 0, y: 0, width: height, height: width))

    default:
        context.draw(cgImage, in: CGRect(x: 0, y: 0, width: width, height: height))
    }

    // And now we just create a new UIImage from the drawing context
    guard let newCGImg = context.makeImage() else {
        return nil
    }

    let img = UIImage(cgImage: newCGImg)

    return img;
}

（注意：Swift 3版本的odes可以在Xcode 8.1下进行编译，但尚未对其进行实际测试。在某处可能有错字，宽度/高度混合，等等。请随时指出/修复任何错误）。

— 尼古拉斯·米亚里（Nicolas Miari）
source
转换为
— Swift
图像方向完全不变。抱歉，我是iOS开发的新手。我所做的是，我使用该函数进行UIImage扩展，然后在内部以编程方式对其进行设置func viewDidLoad。该图像来自三星手机photos.google.com/share/…，具有270 CW方向的exif数据。我在这里使用它的方法let background: UIImage? = UIImage(named: "background_image")?.fixOrientation() backgroundImage.image = background
— HendraWD
使用此@Nicolas的人遇到内存泄漏问题吗？看起来CGImages没有被释放。我的应用程序是一个大规模照片管理应用程序，可以处理许多照片。每次运行时，此函数似乎正在泄漏内存。是否有任何快速解决方案？
— Michael Reilly
@MichaelReilly Hmm，没有详细研究它，但是CoreGraphics调用应该可以迅速地与ARC配合使用。
— Nicolas Miari '17
@MichaelReilly我找到了这个答案，这似乎证实了我的观察结果：stackoverflow.com/a/25790214/433373
— Nicolas Miari
23

此方法首先检查UIImage的当前方向，然后按顺时针方向更改方向并返回UIImage。您可以将该图像显示为

self.imageView.image = rotationImage（currentUIImage）

   func rotateImage(image:UIImage)->UIImage
    {
        var rotatedImage = UIImage();
        switch image.imageOrientation
        {
            case UIImageOrientation.Right:
            rotatedImage = UIImage(CGImage:image.CGImage!, scale: 1, orientation:UIImageOrientation.Down);

           case UIImageOrientation.Down:
            rotatedImage = UIImage(CGImage:image.CGImage!, scale: 1, orientation:UIImageOrientation.Left);

            case UIImageOrientation.Left:
            rotatedImage = UIImage(CGImage:image.CGImage!, scale: 1, orientation:UIImageOrientation.Up);

             default:
            rotatedImage = UIImage(CGImage:image.CGImage!, scale: 1, orientation:UIImageOrientation.Right);
        }
        return rotatedImage;
    }

Swift 4版本

func rotateImage(image:UIImage) -> UIImage
    {
        var rotatedImage = UIImage()
        switch image.imageOrientation
        {
        case .right:
            rotatedImage = UIImage(cgImage: image.cgImage!, scale: 1.0, orientation: .down)

        case .down:
            rotatedImage = UIImage(cgImage: image.cgImage!, scale: 1.0, orientation: .left)

        case .left:
            rotatedImage = UIImage(cgImage: image.cgImage!, scale: 1.0, orientation: .up)

        default:
            rotatedImage = UIImage(cgImage: image.cgImage!, scale: 1.0, orientation: .right)
        }

        return rotatedImage
    }
— 瓦伦德·辛格
source
嗨Varender，感谢您的协助。您能否就您认为这可能对马丁有什么帮助发展一些意见？如何更优雅不是旋转的数据是你的解决方案？
— J. Chomel
1.我们将从UIImageView中获取当前的UIImage 2.我们将调用此方法（rotateImage）并将此当前UIImage作为参数传递3.将返回的值存储到UIImageView.image / *中，这将在图像视图中旋转数据： ）:)
— varender singh's
先生，根据我的说法，这是最好的答案，因为如果我们旋转整个UIImageView，则UIImageView X将为负值。但是，如果我们旋转数据，则UIImageView将保留在原位置，并且仅数据将被旋转。如果您采用方形UIImageView，则可以使用CGAffineTransformMakeRotate简单地转换整个UIImageView。
— varender singh's
这应该是公认的答案！像魅力一样工作:)
— Ely Dantas
迅速3：rotateImage = UIImage（cgImage：image.cgImage !，缩放比例：1，orientation：UIImageOrientation.right）
— Ansal Antony
18

斯威夫特3.1

func fixImageOrientation(_ image: UIImage)->UIImage {
    UIGraphicsBeginImageContext(image.size)
    image.draw(at: .zero)
    let newImage = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    return newImage ?? image
}
— 水色
source
这是一个完美的解决方案：)
— miff
你应得的全部都是我的朋友
— Mitchell Gant
这是优于那。它可以快速运行4，但事实并非如此。
— AechoLiu
谢谢。如果您需要将图像上传到服务器，则此方法有效，不仅可以显示为大多数其他答案。
— Nomad Developer
9

Swift中的UIImage扩展。实际上，您根本不需要进行所有翻转。这里是Objective-C原始的，但是我添加了尊重原始图像alpha的位（很粗略，但是它可以区分不透明图像和透明图像）。

// from https://github.com/mbcharbonneau/UIImage-Categories/blob/master/UIImage%2BAlpha.m
// Returns true if the image has an alpha layer
    private func hasAlpha() -> Bool {
        guard let cg = self.cgImage else { return false }
        let alpha = cg.alphaInfo
        let retVal = (alpha == .first || alpha == .last || alpha == .premultipliedFirst || alpha == .premultipliedLast)
        return retVal
    }

    func normalizedImage() -> UIImage? {
        if self.imageOrientation == .up {
            return self
        }
        UIGraphicsBeginImageContextWithOptions(self.size, !self.hasAlpha(), self.scale)
        var rect = CGRect.zero
        rect.size = self.size
        self.draw(in: rect)
        let retVal = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return retVal
    }
— 丹·罗森斯塔克
source
8

考虑到图像方向，这是一个可行的鳕鱼样本：

#define rad(angle) ((angle) / 180.0 * M_PI)
- (CGAffineTransform)orientationTransformedRectOfImage:(UIImage *)img
{
    CGAffineTransform rectTransform;
    switch (img.imageOrientation)
    {
        case UIImageOrientationLeft:
            rectTransform = CGAffineTransformTranslate(CGAffineTransformMakeRotation(rad(90)), 0, -img.size.height);
            break;
        case UIImageOrientationRight:
            rectTransform = CGAffineTransformTranslate(CGAffineTransformMakeRotation(rad(-90)), -img.size.width, 0);
            break;
        case UIImageOrientationDown:
            rectTransform = CGAffineTransformTranslate(CGAffineTransformMakeRotation(rad(-180)), -img.size.width, -img.size.height);
            break;
        default:
            rectTransform = CGAffineTransformIdentity;
    };

    return CGAffineTransformScale(rectTransform, img.scale, img.scale);
}


- (UIImage *)croppedImage:(UIImage*)orignialImage InRect:(CGRect)visibleRect{
    //transform visible rect to image orientation
    CGAffineTransform rectTransform = [self orientationTransformedRectOfImage:orignialImage];
    visibleRect = CGRectApplyAffineTransform(visibleRect, rectTransform);

    //crop image
    CGImageRef imageRef = CGImageCreateWithImageInRect([orignialImage CGImage], visibleRect);
    UIImage *result = [UIImage imageWithCGImage:imageRef scale:orignialImage.scale orientation:orignialImage.imageOrientation];
    CGImageRelease(imageRef);
    return result;
}
— 磅周
source
8

我将@Nicolas Miari答案的代码转换为Swift 3，以防有人需要

func fixOrientation() -> UIImage
{

    if self.imageOrientation == UIImageOrientation.up {
        return self
    }

    var transform = CGAffineTransform.identity

    switch self.imageOrientation {
    case .down, .downMirrored:
        transform = transform.translatedBy(x: self.size.width, y: self.size.height)
        transform = transform.rotated(by: CGFloat(M_PI));

    case .left, .leftMirrored:
        transform = transform.translatedBy(x: self.size.width, y: 0);
        transform = transform.rotated(by: CGFloat(M_PI_2));

    case .right, .rightMirrored:
        transform = transform.translatedBy(x: 0, y: self.size.height);
        transform = transform.rotated(by: CGFloat(-M_PI_2));

    case .up, .upMirrored:
        break
    }


    switch self.imageOrientation {

    case .upMirrored, .downMirrored:
        transform = transform.translatedBy(x: self.size.width, y: 0)
        transform = transform.scaledBy(x: -1, y: 1)

    case .leftMirrored, .rightMirrored:
        transform = transform.translatedBy(x: self.size.height, y: 0)
        transform = transform.scaledBy(x: -1, y: 1);

    default:
        break;
    }

    // Now we draw the underlying CGImage into a new context, applying the transform
    // calculated above.
    let ctx = CGContext(
        data: nil,
        width: Int(self.size.width),
        height: Int(self.size.height),
        bitsPerComponent: self.cgImage!.bitsPerComponent,
        bytesPerRow: 0,
        space: self.cgImage!.colorSpace!,
        bitmapInfo: UInt32(self.cgImage!.bitmapInfo.rawValue)
    )



    ctx!.concatenate(transform);

    switch self.imageOrientation {

    case .left, .leftMirrored, .right, .rightMirrored:
        // Grr...
        ctx?.draw(self.cgImage!, in: CGRect(x:0 ,y: 0 ,width: self.size.height ,height:self.size.width))

    default:
        ctx?.draw(self.cgImage!, in: CGRect(x:0 ,y: 0 ,width: self.size.width ,height:self.size.height))
        break;
    }

    // And now we just create a new UIImage from the drawing context
    let cgimg = ctx!.makeImage()

    let img = UIImage(cgImage: cgimg!)

    return img;

}
— Waseem05
source
在Delegate方法中捕获图像后，图像imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any] let imageCaptured:UIImage = info[UIImagePickerControllerOriginalImage] as! UIImage 始终为rightOrientation，并且该方法返回了图像:(
— Sumeet Mourya
是，图像方向始终为.right，但可以在UIImageView上正确显示。苹果有一些内部数据，这些数据在这里可以正确显示
— Waseem05 '17
4

感谢Waseem05的Swift 3翻译，但是当我将它包装到UIImage扩展中并将其放置在父类的外部/下面时，他的方法才对我有用：

extension UIImage {

        func fixOrientation() -> UIImage
        {

            if self.imageOrientation == UIImageOrientation.up {
            return self
        }

        var transform = CGAffineTransform.identity

        switch self.imageOrientation {
        case .down, .downMirrored:
            transform = transform.translatedBy(x: self.size.width, y: self.size.height)
            transform = transform.rotated(by: CGFloat(M_PI));

        case .left, .leftMirrored:
            transform = transform.translatedBy(x: self.size.width, y: 0);
            transform = transform.rotated(by: CGFloat(M_PI_2));

        case .right, .rightMirrored:
            transform = transform.translatedBy(x: 0, y: self.size.height);
            transform = transform.rotated(by: CGFloat(-M_PI_2));

        case .up, .upMirrored:
            break
        }


        switch self.imageOrientation {

        case .upMirrored, .downMirrored:
            transform = transform.translatedBy(x: self.size.width, y: 0)
            transform = transform.scaledBy(x: -1, y: 1)

        case .leftMirrored, .rightMirrored:
            transform = transform.translatedBy(x: self.size.height, y: 0)
            transform = transform.scaledBy(x: -1, y: 1);

        default:
            break;
        }

        // Now we draw the underlying CGImage into a new context, applying the transform
        // calculated above.
        let ctx = CGContext(
            data: nil,
            width: Int(self.size.width),
            height: Int(self.size.height),
            bitsPerComponent: self.cgImage!.bitsPerComponent,
            bytesPerRow: 0,
            space: self.cgImage!.colorSpace!,
            bitmapInfo: UInt32(self.cgImage!.bitmapInfo.rawValue)
        )



        ctx!.concatenate(transform);

        switch self.imageOrientation {

        case .left, .leftMirrored, .right, .rightMirrored:
            // Grr...
            ctx?.draw(self.cgImage!, in: CGRect(x:0 ,y: 0 ,width: self.size.height ,height:self.size.width))

        default:
            ctx?.draw(self.cgImage!, in: CGRect(x:0 ,y: 0 ,width: self.size.width ,height:self.size.height))
            break;
        }

        // And now we just create a new UIImage from the drawing context
        let cgimg = ctx!.makeImage()

        let img = UIImage(cgImage: cgimg!)

        return img;

    }
}

然后用：

let correctedImage:UIImage = wonkyImage.fixOrientation()

一切都很好！当我们不需要前置/后置摄像头和上/下/左/右设备方向元数据时，Apple应该使丢弃方向更加容易。

— 合肥顺
source
4

如果您需要旋转并固定延伸方向以下的图像方向，将很有用。

extension UIImage {

    public func imageRotatedByDegrees(degrees: CGFloat) -> UIImage {
        //Calculate the size of the rotated view's containing box for our drawing space
        let rotatedViewBox: UIView = UIView(frame: CGRect(x: 0, y: 0, width: self.size.width, height: self.size.height))
        let t: CGAffineTransform = CGAffineTransform(rotationAngle: degrees * CGFloat.pi / 180)
        rotatedViewBox.transform = t
        let rotatedSize: CGSize = rotatedViewBox.frame.size
        //Create the bitmap context
        UIGraphicsBeginImageContext(rotatedSize)
        let bitmap: CGContext = UIGraphicsGetCurrentContext()!
        //Move the origin to the middle of the image so we will rotate and scale around the center.
        bitmap.translateBy(x: rotatedSize.width / 2, y: rotatedSize.height / 2)
        //Rotate the image context
        bitmap.rotate(by: (degrees * CGFloat.pi / 180))
        //Now, draw the rotated/scaled image into the context
        bitmap.scaleBy(x: 1.0, y: -1.0)
        bitmap.draw(self.cgImage!, in: CGRect(x: -self.size.width / 2, y: -self.size.height / 2, width: self.size.width, height: self.size.height))
        let newImage: UIImage = UIGraphicsGetImageFromCurrentImageContext()!
        UIGraphicsEndImageContext()
        return newImage
    }


    public func fixedOrientation() -> UIImage {
        if imageOrientation == UIImageOrientation.up {
            return self
        }

        var transform: CGAffineTransform = CGAffineTransform.identity

        switch imageOrientation {
        case UIImageOrientation.down, UIImageOrientation.downMirrored:
            transform = transform.translatedBy(x: size.width, y: size.height)
            transform = transform.rotated(by: CGFloat.pi)
            break
        case UIImageOrientation.left, UIImageOrientation.leftMirrored:
            transform = transform.translatedBy(x: size.width, y: 0)
            transform = transform.rotated(by: CGFloat.pi/2)
            break
        case UIImageOrientation.right, UIImageOrientation.rightMirrored:
            transform = transform.translatedBy(x: 0, y: size.height)
            transform = transform.rotated(by: -CGFloat.pi/2)
            break
        case UIImageOrientation.up, UIImageOrientation.upMirrored:
            break
        }

        switch imageOrientation {
        case UIImageOrientation.upMirrored, UIImageOrientation.downMirrored:
            transform.translatedBy(x: size.width, y: 0)
            transform.scaledBy(x: -1, y: 1)
            break
        case UIImageOrientation.leftMirrored, UIImageOrientation.rightMirrored:
            transform.translatedBy(x: size.height, y: 0)
            transform.scaledBy(x: -1, y: 1)
        case UIImageOrientation.up, UIImageOrientation.down, UIImageOrientation.left, UIImageOrientation.right:
            break
        }

        let ctx: CGContext = CGContext(data: nil,
                                       width: Int(size.width),
                                       height: Int(size.height),
                                       bitsPerComponent: self.cgImage!.bitsPerComponent,
                                       bytesPerRow: 0,
                                       space: self.cgImage!.colorSpace!,
                                       bitmapInfo: CGImageAlphaInfo.premultipliedLast.rawValue)!

        ctx.concatenate(transform)

        switch imageOrientation {
        case UIImageOrientation.left, UIImageOrientation.leftMirrored, UIImageOrientation.right, UIImageOrientation.rightMirrored:
            ctx.draw(self.cgImage!, in: CGRect(x: 0, y: 0, width: size.height, height: size.width))
        default:
            ctx.draw(self.cgImage!, in: CGRect(x: 0, y: 0, width: size.width, height: size.height))
            break
        }

        let cgImage: CGImage = ctx.makeImage()!

        return UIImage(cgImage: cgImage)
    }
}
— 达瓦尔·H·内娜
source
2 
extension UIImage {
    func fixImageOrientation() -> UIImage {
        UIGraphicsBeginImageContext(self.size)
        self.draw(at: .zero)
        let newImage = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return newImage ?? self
    }
}
  1. 像上面的例子一样创建扩展名。

  2. 称之为：imageView.image?.fixImageOrientation()或UIImage(named: "someImage").fixImageOrientation()

  3. 祝你好运！

— 米海尔·萨拉里（Mihail Salari）
source
这很好。但是内存像任何东西一样堆积，如果在循环中调用它，则应用程序将崩溃。
— abhimuralidharan
@abhimuralidharan，我没有对其进行循环检查，但100％存在一种应用方式。
— Mihail Salari
0

灵感来自@Aqua Answer .....

在目标C中

- (UIImage *)fixImageOrientation:(UIImage *)img {

   UIGraphicsBeginImageContext(img.size);
   [img drawAtPoint:CGPointZero];

   UIImage *newImg = UIGraphicsGetImageFromCurrentImageContext();
   UIGraphicsEndImageContext();

   if (newImg) {
       return newImg;
   }

   return img;
}
— umakanta
source
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