RGB HSV HLS三种色彩模式转换（C语言实现）

Android项目上处理图像的代码（注释全部去掉）

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void RGB2HSV( uint16_t * h, uint16_t * s, uint16_t * v, uint8_t r, uint8_t g, uint8_t b) {     double rr, gg, bb;     double hh, ss, vv;     double cmax, cmin, cdes;       rr = r;     gg = g;     bb = b;       cmax = (rr > gg) ? rr : gg;     if (bb > cmax) {         cmax = bb;     }       cmin = (rr < gg) ? rr : gg;     if (bb < cmin) {         cmin = bb;     }       cdes = cmax - cmin;     vv = cmax;     if (cdes != 0) {         ss = cdes * SCALE / cmax;         if (cmax == rr) {             hh = (gg - bb) * SCALE / cdes;         }else if (cmax == gg) {             hh = (bb - rr) * SCALE / cdes + 2 * H_SCALE;         }else {             hh = (rr - gg) * SCALE / cdes + 4 * H_SCALE;         }     }else if (cmax != 0) {         ss = cdes * SCALE / cmax;         hh = 0;     }else {         ss = 0;         hh = 0;     }     if (hh < 0) {         hh += 6 * H_SCALE;     }       *h = hh * H_GETA;     *s = ss * H_GETA;     *v = vv * H_GETA; }   void HSV2RGB( uint8_t *r, uint8_t *g, uint8_t *b, uint16_t h, uint16_t s, uint16_t v) {     double rr = 0, gg = 0, bb = 0;     double hh, ss, vv;       if (h == 6 * H_GETA * H_SCALE) {         h = 0;     }     hh = (double)h / H_GETA;     ss = (double)s / GETA;     vv = (double)v / GETA;       switch((int)(hh / H_SCALE)) {         case 0:             rr = SCALE;             gg = hh;             bb = 0;             break;         case 1:             rr = 2 * H_SCALE - hh;             gg = SCALE;             bb = 0;             break;         case 2:             rr = 0;             gg = SCALE;             bb = hh - 2 * H_SCALE;             break;         case 3:             rr = 0;             gg = 4 * H_SCALE - hh;             bb = SCALE;             break;         case 4:             rr = hh - 4 * H_SCALE;             gg = 0;             bb = SCALE;             break;         case 5:             rr = SCALE;             gg = 0;             bb = 6 * H_SCALE - hh;             break;     }       rr = (rr + (SCALE - rr) * (SCALE - ss) / SCALE) * vv / SCALE;     gg = (gg + (SCALE - gg) * (SCALE - ss) / SCALE) * vv / SCALE;     bb = (bb + (SCALE - bb) * (SCALE - ss) / SCALE) * vv / SCALE;       *r = rr;     *g = gg;     *b = bb;     if (*r > 255)*r = 255;     if (*g > 255)*g = 255;     if (*b > 255)*b = 255; }   void RGB2HLS( double *h, double *l, double *s, uint8_t r, uint8_t g, uint8_t b) {     double dr = (double)r/255;     double dg = (double)g/255;     double db = (double)b/255;     double cmax = MAX(dr, MAX(dg, db));     double cmin = MIN(dr, MIN(dg, db));     double cdes = cmax - cmin;     double hh, ll, ss;       ll = (cmax+cmin)/2;     if(cdes){         if(ll <= 0.5)             ss = (cmax-cmin)/(cmax+cmin);         else             ss = (cmax-cmin)/(2-cmax-cmin);           if(cmax == dr)             hh = (0+(dg-db)/cdes)*60;         else if(cmax == dg)             hh = (2+(db-dr)/cdes)*60;         else// if(cmax == b)             hh = (4+(dr-dg)/cdes)*60;         if(hh<0)             hh+=360;     }else         hh = ss = 0;       *h = hh;     *l = ll;     *s = ss; }   void HLS2RGB( uint8_t *r, uint8_t *g, uint8_t *b, double h, double l, double s) {     double cmax,cmin;       if(l <= 0.5)         cmax = l*(1+s);     else         cmax = l*(1-s)+s;     cmin = 2*l-cmax;       if(s == 0){         *r = *g = *b = l*255;     }else{         *r = HLS2RGBvalue(cmin,cmax,h+120)*255;         *g = HLS2RGBvalue(cmin,cmax,h)*255;         *b = HLS2RGBvalue(cmin,cmax,h-120)*255;     } }   double HLS2RGBvalue(double n1,double n2, double hue) {     if(hue > 360)         hue -= 360;     else if(hue < 0)         hue += 360;     if(hue < 60)         return n1+(n2-n1)*hue/60;     else if(hue < 180)         return n2;     else if(hue < 240)         return n1+(n2-n1)*(240-hue)/60;     else         return n1; }