C#RGB和HSB相互轉換

2019-11-14 14:05:38

字體：大中小

來源：轉載

供稿：網友

背景

最近做的項目中有這樣一個場景，設置任意一種顏色，得到這種顏色偏深和偏淺的兩種顏色。也就是說取該顏色同色系的深淺兩種顏色。首先想到的是調節透明度，但效果不理想。后來嘗試調節顏色亮度，發現這才是正解。但是.NET中不能直接改變Color的亮度，需要將Color轉換成HSB模式，然后改變B的值調節亮度。調節亮度后需要再轉換成我們熟悉的RGB模式才能使用。下面給出顏色轉換方法。

代碼

 1     /// <summary> 2     /// 顏色轉換幫助類 3     /// </summary> 4     public class ColorConversionHelper 5     { 6         /// <summary> 7         ///  RGB轉HSB 8         /// </summary> 9         /// <param name="red">紅色值</param>10         /// <param name="green">綠色值</param>11         /// <param name="blue">藍色值</param>12         /// <returns>返回：HSB值集合</returns>13         public static List<float> RGBtoHSB(int red, int green, int blue)14         {15             List<float> hsbList = new List<float>();16             System.Drawing.Color dColor = System.Drawing.Color.FromArgb(red, green, blue);17             hsbList.Add(dColor.GetHue());18             hsbList.Add(dColor.GetSaturation());19             hsbList.Add(dColor.GetBrightness());20             return hsbList;21         }22 23 24         /// <summary>25         /// HSB轉RGB26         /// </summary>27         /// <param name="hue">色調</param>28         /// <param name="saturation">飽和度</param>29         /// <param name="brightness">亮度</param>30         /// <returns>返回：Color</returns>31         public static Color HSBtoRGB(float hue, float saturation, float brightness)32         {33             int r = 0, g = 0, b = 0;34             if (saturation == 0)35             {36                 r = g = b = (int)(brightness * 255.0f + 0.5f);37             }38             else39             {40                 float h = (hue - (float)Math.Floor(hue)) * 6.0f;41                 float f = h - (float)Math.Floor(h);42                 float p = brightness * (1.0f - saturation);43                 float q = brightness * (1.0f - saturation * f);44                 float t = brightness * (1.0f - (saturation * (1.0f - f)));45                 switch ((int)h)46                 {47                     case 0:48                         r = (int)(brightness * 255.0f + 0.5f);49                         g = (int)(t * 255.0f + 0.5f);50                         b = (int)(p * 255.0f + 0.5f);51                         break;52                     case 1:53                         r = (int)(q * 255.0f + 0.5f);54                         g = (int)(brightness * 255.0f + 0.5f);55                         b = (int)(p * 255.0f + 0.5f);56                         break;57                     case 2:58                         r = (int)(p * 255.0f + 0.5f);59                         g = (int)(brightness * 255.0f + 0.5f);60                         b = (int)(t * 255.0f + 0.5f);61                         break;62                     case 3:63                         r = (int)(p * 255.0f + 0.5f);64                         g = (int)(q * 255.0f + 0.5f);65                         b = (int)(brightness * 255.0f + 0.5f);66                         break;67                     case 4:68                         r = (int)(t * 255.0f + 0.5f);69                         g = (int)(p * 255.0f + 0.5f);70                         b = (int)(brightness * 255.0f + 0.5f);71                         break;72                     case 5:73                         r = (int)(brightness * 255.0f + 0.5f);74                         g = (int)(p * 255.0f + 0.5f);75                         b = (int)(q * 255.0f + 0.5f);76                         break;77                 }78             }79             return Color.FromArgb(Convert.ToByte(255), Convert.ToByte(r), Convert.ToByte(g), Convert.ToByte(b));80         }81     }