HSV(Hue, Saturation, Value)是根据颜色的直观特性由A. R. Smith在1978年创建的一种颜色空间, 也称六角锥体模型(Hexcone Model)。这个模型中颜色的参数分别是：色调（H），饱和度（S），明度（V）。
色调H
用角度度量，取值范围为0°～360°，从红色开始按逆时针方向计算，红色为0°，绿色为120°,蓝色为240°。它们的补色是：黄色为60°，青色为180°,紫色为300°；
饱和度S
饱和度S表示颜色接近光谱色的程度。一种颜色，可以看成是某种光谱色与白色混合的结果。其中光谱色所占的比例愈大，颜色接近光谱色的程度就愈高，颜色的饱和度也就愈高。饱和度高，颜色则深而艳。光谱色的白光成分为0，饱和度达到最高。通常取值范围为0%～100%，值越大，颜色越饱和。
明度V
明度表示颜色明亮的程度，对于光源色，明度值与发光体的光亮度有关；对于物体色，此值和物体的透射比或反射比有关。通常取值范围为0%（黑）到100%（白）。
//-------以下是HSV颜色空间和RGB颜色空间相互转换接口------------/*** @brief HSV颜色空间*/typedef struct {float h; // 色调H(hue) 0~360° {R(0°),G(120°),B(240°)}float s; // 饱和度S(saturation) 0~1.0float v; // 明度V(value) 0~1.0 }color_hsv_t;typedef struct {unsigned char r; // 0-255unsigned char g; // 0-255unsigned char b; // 0-255unsigned int color; // 0x000000 ~ 0xffffff}color_rgb_t;/*** @brief RGB颜色空间 转 HSV颜色空间 * @param rgb:RGB颜色空间参数* @param hsv:HSV颜色空间参数* @return none*/void rgb2hsv(color_rgb_t *rgb, color_hsv_t *hsv);/*** @brief HSV颜色空间 转 RGB颜色空间* @param hsv:HSV颜色空间参数* @param rgb:RGB颜色空间参数* @return none*/void hsv2rgb(color_hsv_t *hsv, color_rgb_t *rgb);/*** @brief 调节HSV颜色空间 H值(0.0~360.0)* @param hsv:HSV颜色空间参数* @param h_offset:调节参数 增加>0.0，减小<0.0* @return none*/void hsv_adjust_h(color_hsv_t *hsv, float h_offset);/*** @brief 调节HSV颜色空间 S值(0.0~1.0)* @param hsv:HSV颜色空间参数* @param s_offset:调节参数 增加>0.0，减小<0.0* @return none*/void hsv_adjust_s(color_hsv_t *hsv, float s_offset);/*** @brief 调节HSV颜色空间 V值(0.0~1.0)* @param hsv:HSV颜色空间参数* @param v_offset:调节参数 增加>0.0，减小<0.0* @return none*/void hsv_adjust_v(color_hsv_t *hsv, float v_offset);// 以下是HSV颜色空间和RGB颜色空间相互转换接口/*********************************************************************************************红： R 255 H:0G 0 S:100B 0 V:100 绿：R 0 H:120 G 255 S:100B 0 V:100 蓝：R 0 H:240 G 0 S:100B 255 V:100 *********************************************************************************************/#define max(a,b) ((a) > (b) ? (a) : (b))#define min(a,b) ((a) < (b) ? (a) : (b))#define max3(a,b,c) (((a) > (b) ? (a) : (b)) > (c) ? ((a) > (b) ? (a) : (b)) : (c))#define min3(a,b,c) (((a) < (b) ? (a) : (b)) < (c) ? ((a) < (b) ? (a) : (b)) : (c))/*********************************************************************************************RGB转化到HSV的算法:max=max(R,G,B)；min=min(R,G,B)；V=max(R,G,B)；S=(max-min)/max；if (R = max) H =(G-B)/(max-min)* 60；if (G = max) H = 120+(B-R)/(max-min)* 60；if (B = max) H = 240 +(R-G)/(max-min)* 60；if (H < 0) H = H + 360；***********************************************************************************************//*** @brief RGB颜色空间 转 HSV颜色空间 * @param rgb:RGB颜色空间参数* @param hsv:HSV颜色空间参数* @note The R,G,B values are divided by 255 to change the range from 0..255 to 0..1:* @return none*/void rgb2hsv(color_rgb_t *rgb, color_hsv_t *hsv){float max, min, delta=0;float r = (float)((float)((int)rgb->r)/255);float g = (float)((float)((int)rgb->g)/255);float b = (float)((float)((int)rgb->b)/255);max = max3(r, g, b);min = min3(r, g, b);delta = (max - min);//printf("r:%f, g:%f, b:%f\n", r, g, b);if (delta == 0) {hsv->h = 0;} else {if (r == max) {hsv->h = ((g-b)/delta)*60; } else if (g == max) {hsv->h = 120+(((b-r)/delta)*60); } else if (b == max) {hsv->h = 240 + (((r-g)/delta)*60);}if (hsv->h < 0) {hsv->h += 360;}}if (max == 0) {hsv->s = 0;} else {hsv->s = (float)(delta/max);}hsv->v = max;rgb->color = (unsigned int)(((rgb->r&0xff)<<16) | ((rgb->g&0xff)<<8) | (rgb->b&0xff));}/*************************************************************************HSV转化到RGB的算法:if (s = 0)R=G=B=V;elseH /= 60;i = INTEGER(H);f = H - i;a = V * ( 1 - s );b = V * ( 1 - s * f );c = V * ( 1 - s * (1 - f ) );switch(i)case 0: R = V; G = c; B = a;case 1: R = b; G = v; B = a;case 2: R = a; G = v; B = c;case 3: R = a; G = b; B = v;case 4: R = c; G = a; B = v;case 5: R = v; G = a; B = b;*******************************************************************************//*** @brief HSV颜色空间 转 RGB颜色空间* @param hsv:HSV颜色空间参数* @param rgb:RGB颜色空间参数* @note When 0 ≤ H < 360, 0 ≤ S ≤ 1 and 0 ≤ V ≤ 1:* @return none*/void hsv2rgb(color_hsv_t *hsv, color_rgb_t *rgb){int i;float f,a,b,c;float h = hsv->h;float s = hsv->s;float v = hsv->v;if (h >= 360) {h = 0;}if (s == 0) {rgb->r = (unsigned char)((int)(v*255));rgb->g = (unsigned char)((int)(v*255));rgb->b = (unsigned char)((int)(v*255));} else {h /= 60.0; // sector 0 to 5, h_max=360 360/60=6[0,1,2,3,4,5]i = (int)floor(h); // floor(h)f = h-i; // factorial path of ha = v * (1-s);b = v * (1-s*f);c = v * (1-s*(1-f));switch(i) {case 0:rgb->r = (unsigned char)((int)(v*255)); //v*255rgb->g = (unsigned char)((int)(c*255)); //c*255;rgb->b = (unsigned char)((int)(a*255)); //a*255;break;case 1:rgb->r = (unsigned char)((int)(b*255)); //b*255;rgb->g = (unsigned char)((int)(v*255)); //v*255;rgb->b = (unsigned char)((int)(a*255)); //a*255;break;case 2:rgb->r = (unsigned char)((int)(a*255)); //a*255;rgb->g = (unsigned char)((int)(v*255)); //v*255;rgb->b = (unsigned char)((int)(c*255)); //c*255;break;case 3:rgb->r = (unsigned char)((int)(a*255));//a*255;rgb->g = (unsigned char)((int)(b*255));//b*255;rgb->b = (unsigned char)((int)(v*255));//v*255;break;case 4:rgb->r = (unsigned char)((int)(c*255)); //c*255;rgb->g = (unsigned char)((int)(a*255)); //a*255;rgb->b = (unsigned char)((int)(v*255)); //v*255;break;default:rgb->r = (unsigned char)((int)(v*255)); //v*255;rgb->g = (unsigned char)((int)(a*255)); //a*255;rgb->b = (unsigned char)((int)(b*255)); //b*255;break;}}rgb->color = (unsigned int)(((rgb->r&0xff)<<16) | ((rgb->g&0xff)<<8) | (rgb->b&0xff));}/*** @brief 调节HSV颜色空间 H值(0.0~360.0)* @param hsv:HSV颜色空间参数* @param h_offset:调节参数 增加>0.0，减小<0.0* @return none*/void hsv_adjust_h(color_hsv_t *hsv, float h_offset){hsv->h += h_offset;if (hsv->h >= 360) {hsv->h = 360;} else if (hsv->h<=0) {hsv->h = 0;}}/*** @brief 调节HSV颜色空间 S值(0.0~1.0)* @param hsv:HSV颜色空间参数* @param s_offset:调节参数 增加>0.0，减小<0.0* @return none*/void hsv_adjust_s(color_hsv_t *hsv, float s_offset){hsv->s += s_offset;if (hsv->s >= 1.0) {hsv->s = 1.0;} else if (hsv->s <= 0) {hsv->s = 0;}}/*** @brief 调节HSV颜色空间 V值(0.0~1.0)* @param hsv:HSV颜色空间参数* @param v_offset:调节参数 增加>0.0，减小<0.0* @return none*/void hsv_adjust_v(color_hsv_t *hsv, float v_offset){hsv->v += v_offset;if (hsv->v >= 1.0) {hsv->v = 1.0;} else if (hsv->v<=0) {hsv->v = 0;}}// 测试代码static color_hsv_t hsv;static color_hsv_t tmp_hsv；static color_rgb_t rgb;// 调节H的值整数增加，负数减小hsv_adjust_h(&hsv, 10.0);hsv_adjust_h(&hsv, -10.0);// 调节S的值整数增加，负数减小hsv_adjust_s(&hsv, 0.05);hsv_adjust_s(&hsv, -0.05);// 调节S的值整数增加，负数减小hsv_adjust_v(&hsv, 0.05);hsv_adjust_v(&hsv, -0.05);// HSV颜色空间转RGB颜色空间hsv.h = 0;// 色调H(hue) 0~360° {R(0°),G(120°),B(240°)}hsv.s = 0.5; // 饱和度S(saturation) 0~1.0hsv.v = 1;// 亮度V(value) 0~1.0 hsv2rgb(&hsv, &rgb);printf("h:%f, s:%f, v:%f, r:%d, g:%d, b:%d, color:0x%06x\n", hsv.h, hsv.s, hsv.v, rgb.r, rgb.g, rgb.b, rgb.color);// RGB颜色空间转HSV颜色空间rgb.r = 0xff; // Red 0~255rgb.g = 0x00; // Green 0~255rgb.b = 0x00; // Blue 0~255rgb2hsv(&rgb, &tmp_hsv);printf("h:%f, s:%f, v:%f\n\n", tmp_hsv.h, tmp_hsv.s, tmp_hsv.v);
