如何将RGB颜色更改为HSV?

时间:2008-12-11 14:53:36

标签: c# colors rgb hsv

如何将RGB颜色更改为HSV?在C#语言中。 我在没有任何外部库的情况下搜索非常快的方法。

6 个答案:

答案 0 :(得分:98)

请注意,Color.GetSaturation()Color.GetBrightness()会返回HSL值,而不是HSV 以下代码演示了不同之处。

Color original = Color.FromArgb(50, 120, 200);
// original = {Name=ff3278c8, ARGB=(255, 50, 120, 200)}

double hue;
double saturation;
double value;
ColorToHSV(original, out hue, out saturation, out value);
// hue        = 212.0
// saturation = 0.75
// value      = 0.78431372549019607

Color copy = ColorFromHSV(hue, saturation, value);
// copy = {Name=ff3278c8, ARGB=(255, 50, 120, 200)}

// Compare that to the HSL values that the .NET framework provides: 
original.GetHue();        // 212.0
original.GetSaturation(); // 0.6
original.GetBrightness(); // 0.490196079

以下C#代码就是您想要的。它使用Wikipedia中描述的算法在RGB和HSV之间进行转换。 hue的范围为0 - 360,saturationvalue的范围为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);
}

答案 1 :(得分:26)

您是否考虑过简单地使用System.Drawing命名空间?例如:

System.Drawing.Color color = System.Drawing.Color.FromArgb(red, green, blue);
float hue = color.GetHue();
float saturation = color.GetSaturation();
float lightness = color.GetBrightness();

请注意,这并不是您要求的(请参阅differences between HSL and HSV,而且Color类没有从HSL / HSV转换回来,但后者合理easy to add

答案 2 :(得分:5)

这里有一个C实现:

http://www.cs.rit.edu/~ncs/color/t_convert.html

转换为C#应该非常简单,因为几乎没有函数被调用 - 只是计算。

通过Google

找到

答案 3 :(得分:4)

EasyRGB有很多色彩空间转换。 Here is the code用于RGB-> HSV转换。

答案 4 :(得分:3)

这是VB.net版本,对于我从BlaM帖子中的C代码移植来说效果很好。

  

这里有一个C实现:

     

http://www.cs.rit.edu/~ncs/color/t_convert.html

     

转换为C#应该非常简单,因为几乎没有函数被调用 - 只是>计算


Public Sub HSVtoRGB(ByRef r As Double, ByRef g As Double, ByRef b As Double, ByVal h As Double, ByVal s As Double, ByVal v As Double)
    Dim i As Integer
    Dim f, p, q, t As Double

    If (s = 0) Then
        ' achromatic (grey)
        r = v
        g = v
        b = v
        Exit Sub
    End If

    h /= 60 'sector 0 to 5
    i = Math.Floor(h)
    f = h - i 'factorial part of h
    p = v * (1 - s)
    q = v * (1 - s * f)
    t = v * (1 - s * (1 - f))

    Select Case (i)
        Case 0
            r = v
            g = t
            b = p
            Exit Select
        Case 1
            r = q
            g = v
            b = p
            Exit Select
        Case 2
            r = p
            g = v
            b = t
            Exit Select
        Case 3
            r = p
            g = q
            b = v
            Exit Select
        Case 4
            r = t
            g = p
            b = v
            Exit Select
        Case Else   'case 5:
            r = v
            g = p
            b = q
            Exit Select
    End Select
End Sub

答案 5 :(得分:0)

FIRST:确保你有一个颜色作为位图,如下所示:

Bitmap bmp = (Bitmap)pictureBox1.Image.Clone();
paintcolor = bmp.GetPixel(e.X, e.Y);

(e来自事件处理者,他选择了我的颜色!)

当我遇到这个问题时,我做了什么,我首先得到了rgba(红色,绿色,蓝色和alpha)值。 接下来我创建了3个浮点数:浮动色调,浮动饱和度,浮动亮度。然后你只需:

hue = yourcolor.Gethue;
saturation = yourcolor.GetSaturation;
brightness = yourcolor.GetBrightness;

整个地段看起来像这样:

Bitmap bmp = (Bitmap)pictureBox1.Image.Clone();
            paintcolor = bmp.GetPixel(e.X, e.Y);
            float hue;
            float saturation;
            float brightness;
            hue = paintcolor.GetHue();
            saturation = paintcolor.GetSaturation();
            brightness = paintcolor.GetBrightness();

如果您现在想要在标签中显示它们,请执行以下操作:

yourlabelname.Text = hue.ToString;
yourlabelname.Text = saturation.ToString;
yourlabelname.Text = brightness.ToString;

在这里,您现在将RGB值转换为HSV值:)

希望这有帮助

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