specrend.h

#ifndef _SPECREND_H
#define _SPECREND_H

/* A colour system is defined by the CIE x and y coordinates of
   its three primary illuminants and the x and y coordinates of
   the white point. */
struct colourSystem
{
  const char *name;      	   /* Colour system name */
  double xRed, yRed,	    	 /* Red x, y */
         xGreen, yGreen,  	 /* Green x, y */
         xBlue, yBlue,    	 /* Blue x, y */
         xWhite, yWhite,  	 /* White point x, y */
	       gamma;   	    	   /* Gamma correction for system */
};

extern colourSystem NTSCsystem;
extern colourSystem EBUsystem;
extern colourSystem SMPTEsystem;
extern colourSystem CIEsystem;
extern colourSystem Rec709system;
extern double bbTemp;                 /* Hidden temperature argument */

void spectrum_to_xyz(double (*spec_intens)(double wavelength), double *x, double *y, double *z);
extern void xyz_to_rgb(struct colourSystem *cs, double xc, double yc, double zc, double *r, double *g, double *b);
extern double bb_spectrum(double wavelength);
extern void norm_rgb(double *r, double *g, double *b);
extern double bb_spectrum(double wavelength);

#endif