lab.h

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/*************************************************************************
 * Copyright (c) 2014 AT&T Intellectual Property 
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors: Details at https://graphviz.org
 *************************************************************************/
 
#pragma once
 
struct rgb_struct {
  double r, g, b;/* 0 to 255 */
};
typedef struct rgb_struct color_rgb;
 
struct xyz_struct {
  double x, y, z;
};
typedef struct xyz_struct color_xyz;
 
struct lab_struct {
  double l, a, b; 
};
typedef struct lab_struct color_lab;
 
color_xyz RGB2XYZ(color_rgb color);
color_rgb XYZ2RGB(color_xyz color);
color_lab RGB2LAB(color_rgb color);
void LAB2RGB_real_01(double *color);  /* convert an array[3] of LAB colors to RGB between 0 to 1, in place */
color_rgb LAB2RGB(color_lab color);
color_rgb color_rgb_init(double r, double g, double b);
color_xyz color_xyz_init(double x, double y, double z);
color_lab color_lab_init(double l, double a, double b);
QuadTree lab_gamut_quadtree(
    const int *lightness,
    int max_qtree_level); 
double *lab_gamut(const int *lightness,
                  int *n); 
 
double *color_blend_rgb2lab(char *color_list, const int maxpoints);