我正在使用Swift做一些视频处理。升级到El Capitan(和Swift 2)后,我的代码崩溃了。我将错误追溯到CIFilter函数CIColorClamp。这个函数被认为是钳位像素值,但实际上会混淆图像范围。CIColorClamp在OS X中无法正常工作El Capitan
let _c:CGFloat = 0.05
let minComp = CIVector(x:_c, y:_c, z:_c, w: 1)
let maxComp = CIVector(x:1, y:1, z:1, w: 1)
let clamp: CIFilter = CIFilter(name: "CIColorClamp")!
print("clamp-in \(image.extent)")
clamp.setDefaults()
clamp.setValue(image, forKey: kCIInputImageKey)
clamp.setValue(minComp, forKey: "inputMinComponents")
clamp.setValue(maxComp, forKey: "inputMaxComponents")
print("clamp-out \(clamp.outputImage!.extent)")
上面代码的输出:
> clamp-in (6.0, 6.0, 1268.0, 708.0)
CoreAnimation: Warning! CAImageQueueSetOwner() is deprecated and does nothing. Please stop calling this method.
> clamp-out (-8.98846567431158e+307, -8.98846567431158e+307, 1.79769313486232e+308, 1.79769313486232e+308)
,这个调用产生一个内部警告没有任何灌输信心的事实!
任何人都可以证实此行为?我究竟做错了什么?