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。
答案 0 :(得分:98)
请注意,Color.GetSaturation()
和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,saturation
或value
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