Question

converting HSV to RGB的.NET框架中是否内置了一个API？我没有在System.Drawing.Color中看到一个方法，但是平台上没有一个方法似乎令人惊讶。

Answer 1

没有内置方法可以做到这一点，但计算并不是非常复杂另请注意，Color的GetHue（），GetSaturation（）和GetBrightness（）返回HSL值，而不是HSV。

以下C＃代码使用Wikipedia中描述的算法在RGB和HSV之间进行转换我已经发布了这个答案here，但我会在这里复制代码以供快速参考。

色调范围为0 - 360，饱和度或值范围为0 - 1。

public static void ColorToHSV(Color color, out double hue, out double saturation, out double value)
{
    int max = Math.Max(color.R, Math.Max(color.G, color.B));
    int min = Math.Min(color.R, Math.Min(color.G, color.B));

    hue = color.GetHue();
    saturation = (max == 0) ? 0 : 1d - (1d * min / max);
    value = max / 255d;
}

public static Color ColorFromHSV(double hue, double saturation, double value)
{
    int hi = Convert.ToInt32(Math.Floor(hue / 60)) % 6;
    double f = hue / 60 - Math.Floor(hue / 60);

    value = value * 255;
    int v = Convert.ToInt32(value);
    int p = Convert.ToInt32(value * (1 - saturation));
    int q = Convert.ToInt32(value * (1 - f * saturation));
    int t = Convert.ToInt32(value * (1 - (1 - f) * saturation));

    if (hi == 0)
        return Color.FromArgb(255, v, t, p);
    else if (hi == 1)
        return Color.FromArgb(255, q, v, p);
    else if (hi == 2)
        return Color.FromArgb(255, p, v, t);
    else if (hi == 3)
        return Color.FromArgb(255, p, q, v);
    else if (hi == 4)
        return Color.FromArgb(255, t, p, v);
    else
        return Color.FromArgb(255, v, p, q);
}

Answer 2

我不认为在.NET框架中有这样做的方法查看Converting HSV to RGB colour using C#

这是实施代码，

void HsvToRgb(double h, double S, double V, out int r, out int g, out int b)
{    
  double H = h;
  while (H < 0) { H += 360; };
  while (H >= 360) { H -= 360; };
  double R, G, B;
  if (V <= 0)
    { R = G = B = 0; }
  else if (S <= 0)
  {
    R = G = B = V;
  }
  else
  {
    double hf = H / 60.0;
    int i = (int)Math.Floor(hf);
    double f = hf - i;
    double pv = V * (1 - S);
    double qv = V * (1 - S * f);
    double tv = V * (1 - S * (1 - f));
    switch (i)
    {

      // Red is the dominant color

      case 0:
        R = V;
        G = tv;
        B = pv;
        break;

      // Green is the dominant color

      case 1:
        R = qv;
        G = V;
        B = pv;
        break;
      case 2:
        R = pv;
        G = V;
        B = tv;
        break;

      // Blue is the dominant color

      case 3:
        R = pv;
        G = qv;
        B = V;
        break;
      case 4:
        R = tv;
        G = pv;
        B = V;
        break;

      // Red is the dominant color

      case 5:
        R = V;
        G = pv;
        B = qv;
        break;

      // Just in case we overshoot on our math by a little, we put these here. Since its a switch it won't slow us down at all to put these here.

      case 6:
        R = V;
        G = tv;
        B = pv;
        break;
      case -1:
        R = V;
        G = pv;
        B = qv;
        break;

      // The color is not defined, we should throw an error.

      default:
        //LFATAL("i Value error in Pixel conversion, Value is %d", i);
        R = G = B = V; // Just pretend its black/white
        break;
    }
  }
  r = Clamp((int)(R * 255.0));
  g = Clamp((int)(G * 255.0));
  b = Clamp((int)(B * 255.0));
}

/// <summary>
/// Clamp a value to 0-255
/// </summary>
int Clamp(int i)
{
  if (i < 0) return 0;
  if (i > 255) return 255;
  return i;
}

Answer 3

它不是内置的，但是有一个名为ColorMine的开源C＃库，它可以很容易地在颜色空间之间进行转换。

Rgb到Hsv：

var rgb = new Rgb {R = 123, G = 11, B = 7};
var hsv = rgb.To<Hsv>();

Hsv to Rgb：

var hsv = new Hsv { H = 360, S = .5, L = .17 }
var rgb = hsv.to<Rgb>();

Answer 4

为此，您可以使用ColorHelper库：

RGB rgb = ColorConverter.HsvToRgb(new HSV(100, 100, 100));

Answer 5

查看具有优秀c＃类的http://richnewman.wordpress.com/hslcolor-class/，以提供所有必要的转换，包括与windows系统颜色之间的转换。

是否有用于HSV到RGB的内置C＃/ .NET系统API？

5 个答案: