【C# / Algorithm】RGB、HSV、HSL颜色模型的互相转换

RGB、HSV、HSL颜色模型的含义本文就不赘述了，大家可以直接百度到。

在此提供一个封装好的可以对三种颜色模型进行互相转换的辅助类。

以上是使用该类写出的程序示例。

以下是颜色模型类的描述

#region RGB / HSV / HSL 颜色模型类/// <summary>/// 类      名：ColorHSL/// 功      能：H 色相 \ S 饱和度(纯度) \ L 亮度 颜色模型 /// 日      期：2015-02-08/// 修      改：2015-03-20/// 作      者：ls9512/// </summary>public class ColorHSL{public ColorHSL(int h, int s, int l){this._h = h;this._s = s;this._l = l;}private int _h;private int _s;private int _l;/// <summary>/// 色相/// </summary>public int H{get { return this._h; }set{this._h = value;this._h = this._h > 360 ? 360 : this._h;this._h = this._h < 0 ? 0 : this._h;}}/// <summary>/// 饱和度(纯度)/// </summary>public int S{get { return this._s; }set{this._s = value;this._s = this._s > 255 ? 255 : this._s;this._s = this._s < 0 ? 0 : this._s;}}/// <summary>/// 饱和度/// </summary>public int L{get { return this._l; }set{this._l = value;this._l = this._l > 255 ? 255 : this._l;this._l = this._l < 0 ? 0 : this._l;}}}/// <summary>/// 类      名：ColorHSV/// 功      能：H 色相 \ S 饱和度(纯度) \ V 明度 颜色模型 /// 日      期：2015-01-22/// 修      改：2015-03-20/// 作      者：ls9512/// </summary>public class ColorHSV{/// <summary>/// 构造方法/// </summary>/// <param name="h"></param>/// <param name="s"></param>/// <param name="v"></param>public ColorHSV(int h, int s, int v){this._h = h;this._s = s;this._v = v;}private int _h;private int _s;private int _v;/// <summary>/// 色相/// </summary>public int H{get { return this._h; }set{this._h = value;this._h = this._h > 360 ? 360 : this._h;this._h = this._h < 0 ? 0 : this._h;}}/// <summary>/// 饱和度(纯度)/// </summary>public int S{get { return this._s; }set{this._s = value;this._s = this._s > 255 ? 255 : this._s;this._s = this._s < 0 ? 0 : this._s;}}/// <summary>/// 明度/// </summary>public int V{get { return this._v; }set{this._v = value;this._v = this._v > 255 ? 255 : this._v;this._v = this._v < 0 ? 0 : this._v;}}}/// <summary>/// 类      名：ColorRGB/// 功      能：R 红色 \ G 绿色 \ B 蓝色 颜色模型///                 所有颜色模型的基类，RGB是用于输出到屏幕的颜色模式，所以所有模型都将转换成RGB输出/// 日      期：2015-01-22/// 修      改：2015-03-20/// 作      者：ls9512/// </summary>public class ColorRGB{/// <summary>/// 构造方法/// </summary>/// <param name="r"></param>/// <param name="g"></param>/// <param name="b"></param>public ColorRGB(int r, int g, int b){this._r = r;this._g = g;this._b = b;}private int _r;private int _g;private int _b;/// <summary>/// 红色/// </summary>public int R{get { return this._r; }set{this._r = value;this._r = this._r > 255 ? 255 : this._r;this._r = this._r < 0 ? 0 : this._r;}}/// <summary>/// 绿色/// </summary>public int G{get { return this._g; }set{this._g = value;this._g = this._g > 255 ? 255 : this._g;this._g = this._g < 0 ? 0 : this._g;}}/// <summary>/// 蓝色/// </summary>public int B{get { return this._b; }set{this._b = value;this._b = this._b > 255 ? 255 : this._b;this._b = this._b < 0 ? 0 : this._b;}}/// <summary>/// 获取实际颜色/// </summary>/// <returns></returns>public Color GetColor(){return Color.FromArgb(this._r, this._g, this._b);}} #endregion

以下是实现颜色模型之间互相转换的类

/// <summary>/// 类      名：ColorHelper/// 功      能：提供从RGB到HSV/HSL色彩空间的相互转换/// 日      期：2015-02-08/// 修      改：2015-03-20/// 作      者：ls9512/// </summary>public static class ColorHelper{/// <summary>/// RGB转换HSV/// </summary>/// <param name="rgb"></param>/// <returns></returns>public static ColorHSV RgbToHsv(ColorRGB rgb){float min, max, tmp, H, S, V;float R = rgb.R * 1.0f / 255, G = rgb.G * 1.0f / 255, B = rgb.B * 1.0f / 255;tmp = Math.Min(R, G);min = Math.Min(tmp, B);tmp = Math.Max(R, G);max = Math.Max(tmp, B);// HH = 0;if (max == min){H = 0;}else if (max == R && G > B){H = 60 * (G - B) * 1.0f / (max - min) + 0;}else if (max == R && G < B){H = 60 * (G - B) * 1.0f / (max - min) + 360;}else if (max == G){H = H = 60 * (B - R) * 1.0f / (max - min) + 120;}else if (max == B){H = H = 60 * (R - G) * 1.0f / (max - min) + 240;}// Sif (max == 0){S = 0;}else{S = (max - min) * 1.0f / max;}// VV = max;return new ColorHSV((int)H, (int)(S * 255), (int)(V * 255));}/// <summary>/// HSV转换RGB/// </summary>/// <param name="hsv"></param>/// <returns></returns>public static ColorRGB HsvToRgb(ColorHSV hsv){if (hsv.H == 360) hsv.H = 359; // 360为全黑，原因不明float R = 0f, G = 0f, B = 0f;if (hsv.S == 0){return new ColorRGB(hsv.V, hsv.V, hsv.V);}float S = hsv.S * 1.0f / 255, V = hsv.V * 1.0f / 255;int H1 = (int)(hsv.H * 1.0f / 60), H = hsv.H;float F = H * 1.0f / 60 - H1;float P = V * (1.0f - S);float Q = V * (1.0f - F * S);float T = V * (1.0f - (1.0f - F) * S);switch (H1){case 0: R = V; G = T; B = P; break;case 1: R = Q; G = V; B = P; break;case 2: R = P; G = V; B = T; break;case 3: R = P; G = Q; B = V; break;case 4: R = T; G = P; B = V; break;case 5: R = V; G = P; B = Q; break;}R = R * 255;G = G * 255;B = B * 255;while (R > 255) R -= 255;while (R < 0) R += 255;while (G > 255) G -= 255;while (G < 0) G += 255;while (B > 255) B -= 255;while (B < 0) B += 255;return new ColorRGB((int)R, (int)G, (int)B);}/// <summary>/// RGB转换HSL/// </summary>/// <param name="rgb"></param>/// <returns></returns>public static ColorHSL RgbToHsl(ColorRGB rgb){float min, max, tmp, H, S, L;float R = rgb.R * 1.0f / 255, G = rgb.G * 1.0f / 255, B = rgb.B * 1.0f / 255;tmp = Math.Min(R, G);min = Math.Min(tmp, B);tmp = Math.Max(R, G);max = Math.Max(tmp, B);// HH = 0;if (max == min){H = 0;  // 此时H应为未定义，通常写为0}else if (max == R && G > B){H = 60 * (G - B) * 1.0f / (max - min) + 0;}else if (max == R && G < B){H = 60 * (G - B) * 1.0f / (max - min) + 360;}else if (max == G){H = H = 60 * (B - R) * 1.0f / (max - min) + 120;}else if (max == B){H = H = 60 * (R - G) * 1.0f / (max - min) + 240;}// L L = 0.5f * (max + min);// SS = 0;if (L == 0 || max == min){S = 0;}else if (0 < L && L < 0.5){S = (max - min) / (L * 2);}else if (L > 0.5){S = (max - min) / (2 - 2 * L);}return new ColorHSL((int)H, (int)(S * 255), (int)(L * 255));}/// <summary>/// HSL转换RGB/// </summary>/// <param name="hsl"></param>/// <returns></returns>public static ColorRGB HslToRgb(ColorHSL hsl){float R = 0f, G = 0f, B = 0f;float S = hsl.S * 1.0f / 255, L = hsl.L * 1.0f / 255;float temp1, temp2, temp3;if (S == 0f) // 灰色{R = L;G = L;B = L;}else{if (L < 0.5f){temp2 = L * (1.0f + S);}else{temp2 = L + S - L * S;}temp1 = 2.0f * L - temp2;float H = hsl.H * 1.0f / 360;// Rtemp3 = H + 1.0f / 3.0f;if (temp3 < 0) temp3 += 1.0f;if (temp3 > 1) temp3 -= 1.0f;R = temp3;// Gtemp3 = H;if (temp3 < 0) temp3 += 1.0f;if (temp3 > 1) temp3 -= 1.0f;G = temp3;// Btemp3 = H - 1.0f / 3.0f;if (temp3 < 0) temp3 += 1.0f;if (temp3 > 1) temp3 -= 1.0f;B = temp3;}R = R * 255;G = G * 255;B = B * 255;return new ColorRGB((int)R, (int)G, (int)B);}}

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