83                 float* sr, float* sg, float* sb) {  in hue()  argument
86           G = *sg,  in hue()
91     *sg = G;  in hue()
96                        float* sr, float* sg, float* sb) {  in saturation()  argument
101     set_sat(&R,&G,&B, sat(*sr,*sg,*sb));  in saturation()
104     *sg = G;  in saturation()
109                   float* sr, float* sg, float* sb) {  in color()  argument
112           G = *sg,  in color()
116     *sg = G;  in color()
121                        float* sr, float* sg, float* sb) {  in luminosity()  argument
126     set_lum(&R,&G,&B, lum(*sr,*sg,*sb));  in luminosity()
128     *sg = G;  in luminosity()