- alpha : weed_rgba_double_t, weed_rgba_int_t
- blue : weed_rgb_double_t, weed_rgb_int_t, weed_rgba_double_t, weed_rgba_int_t
- green : weed_rgb_double_t, weed_rgb_int_t, weed_rgba_double_t, weed_rgba_int_t
- red : weed_rgb_double_t, weed_rgb_int_t, weed_rgba_double_t, weed_rgba_int_t