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[英]iOS: When applying a CIFilter to a UIImage the result image is rotated
[英]Filter applied to UIImage and rotated image using CIFilter
当我将UIImage
应用于过滤器时,图像的结果是图像被旋转了! 我已经试过了:
var filterNames: [String] = ["CIPhotoEffectTonal","CIPhotoEffectNoir","CIMaximumComponent","CIMinimumComponent","CIDotScreen", "CISepiaTone", "CIFalseColor", "CIColorInvert", "CIColorPosterize", "CIPhotoEffectChrome", "CIPhotoEffectInstant"]
let CIfilterName = filterNames[indexPath.row]
print(CIfilterName)
let ciContext = CIContext(options: nil)
let startImage = CIImage(image: originalImage)
let filter = CIFilter(name: CIfilterName)
filter!.setDefaults()
filter!.setValue(startImage, forKey: kCIInputImageKey)
let filteredImageData = filter!.valueForKey(kCIOutputImageKey) as! CIImage
let filteredImageRef = ciContext.createCGImage(filteredImageData, fromRect: filteredImageData.extent)
let originalOrientation: UIImageOrientation = (imageView.image?.imageOrientation)!
let originalScale: CGFloat = (imageView.image?.scale)!
let newPtImage: UIImage = UIImage.imageWithCGImage(filteredImageRef, scale: originalScale, orientation: originalOrientation)
imageView.image = newPtImage
imageView.image = UIImage(CGImage: filteredImageRef);
比例尺的最后一部分是我尝试过的部分,但是我正在显示代码的那部分,以便您可以看到我做错了什么或不知道做什么。
我找到了这个答案,但这是在Objective-c中: obj-c中的Stackoverflow答案
您可以尝试使用UIImageOrientation
来解决此问题,但我绝对建议您使用扩展名的switch
( Github Sample)语句,因为稍后将照片上传到服务器时,它也可能会再次更改其方向。
UIImage(CGImage: imageRef, scale: 1.0, orientation: UIImageOrientation.Right)
当图像高度大于图像宽度时会出现此问题,因此如果图像的高度大于宽度,则应在应用CIFilter之前通过相互交换图像高度和宽度来调整图像的大小。
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