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void        gimp_rgb_to_hsv                 (gint *red,
                                             gint *green,
                                             gint *blue);
void        gimp_hsv_to_rgb                 (gint *hue,
                                             gint *saturation,
                                             gint *value);
void        gimp_rgb_to_hls                 (gint *red,
                                             gint *green,
                                             gint *blue);
gint        gimp_rgb_to_l                   (gint red,
                                             gint green,
                                             gint blue);
void        gimp_hls_to_rgb                 (gint *hue,
                                             gint *lightness,
                                             gint *saturation);
void        gimp_rgb_to_hsv_double          (gdouble *red,
                                             gdouble *green,
                                             gdouble *blue);
void        gimp_hsv_to_rgb_double          (gdouble *hue,
                                             gdouble *saturation,
                                             gdouble *value);
void        gimp_rgb_to_hsv4                (guchar *hsv,
                                             gdouble *red,
                                             gdouble *green,
                                             gdouble *blue);
void        gimp_hsv_to_rgb4                (guchar *rgb,
                                             gdouble hue,
                                             gdouble saturation,
                                             gdouble value);
#define     INTENSITY_RED
#define     INTENSITY_GREEN
#define     INTENSITY_BLUE
#define     INTENSITY                       (r,g,b) |