HSV 转换的错误结果？

Question

我有这段代码可以将 RGB 转换为 HSV

  func rgbToHSV (_ r:Double, _ g:Double, _ b:Double) -> (Double, Double, Double) {

    let cor01 : (Double) -> CGFloat = { valor in
      return CGFloat(valor / 255)
    }

    let corRGB = UIColor(red: cor01(r),
                         green: cor01(g),
                         blue: cor01(b),
                         alpha: 1.0)

    var hue         : CGFloat = CGFloat.infinity
    var saturation  : CGFloat = CGFloat.infinity
    var brightness  : CGFloat = CGFloat.infinity
    var alpha       : CGFloat = CGFloat.infinity

    _ = corRGB.getHue(&hue,
                      saturation:&saturation,
                      brightness:&brightness,
                      alpha:&alpha)

    return (Double(hue), Double(saturation), Double(brightness))
  }

我将 RGB = (168, 131, 126) 转换为 HSV 并得到

HUE = 0.019841269841269771
SAT = 0.24999999999999994
BRI = 0.6588235294117647

我用this site and this site的在线转换，都给了我7度的色相

这是怎么回事？

Answer 1

之所以这样，是因为0.01984126984126977的值是作为一个整体的一部分来的，整体是360度的。您可以乘以 360 并得到 7.1428571428571175.

的值

let result = rgbToHSV(168, 131, 126)
print(result)
print(result.0 * 360)

输出：

(0.01984126984126977, 0.24999999999999994, 0.6588235294117647)
7.1428571428571175

HSV 转换的错误结果？

Wrong results for the HSV conversion?

uicolor

ios

swift