al_color_lab - Allegro 5 API

       Return  an  ALLEGRO_COLOR(3alleg5)  structure  from  CIE  L*a*b* values.  The L* component corresponds to
       luminance from 0..1.  The a* and b* components are in the range -1..+1.

              Note:

              The L*a*b* color space can represent more colors than are visible in sRGB and therefore conversion
              may result in RGB  values  outside  of  the  0..1  range.   You  can  check  for  that  case  with
              al_is_color_valid(3alleg5).

              Note:

              In  some literature the range of L* is 0 to 100 and a* and b* are from -100 to +100.  In that case
              divide all components by 100 before passing them to this function.

       al_color_lab - Allegro 5 API

al_color_lab_to_rgb(3alleg5), al_color_rgb_to_lab(3alleg5)

Allegro reference manual                                                                   al_color_lab(3alleg5)

       5.2.3

              #include <allegro5/allegro_color.h>

              ALLEGRO_COLOR al_color_lab(float l, float a, float b)