ios - 限制 CIImage 返回奇怪的尺寸

Question

我正在尝试裁剪图像并通过夹紧从边缘延伸颜色，但之后返回一个奇怪的图像大小:

let image = UIImage(named: "frame_1")
var ciimage = CIImage(image: image!)

print("\(ciimage!.extent.width) x \(ciimage!.extent.height)")
// at this point it returns "480.0 x 360.0" that is ok

ciimage = ciimage!.clamping(to: CGRect(x: 50, y: 50, width: 480.0, height: 360.0))

print("\(ciimage!.extent.width) x \(ciimage!.extent.height)")
//now it returns two strange values: "1.79769313486232e+308 x 1.79769313486232e+308"

夹紧后不应该返回480.0和360.0吗？我做错了什么？

Answer 1

好的，我解决了这个问题，夹紧后裁剪它:

ciimage = ciimage!.clamping(to: CGRect(x: 50, y: 50, width: 480, height: 360))

ciimage = ciimage!.cropping(to: CGRect(x: 0, y: 0, width: 480, height: 360))

结果正如我所料。