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/*
* International Color Consortium color transform expanded support
*
* Author: Graeme W. Gill
* Date: 2006/5/9
* Version: 1.00
*
* Copyright 2006 Graeme W. Gill
* All rights reserved.
* This material is licenced under the GNU AFFERO GENERAL PUBLIC LICENSE Version 3 :-
* see the License.txt file for licencing details.
*
*/
/*
* This is some test code to test the Daylight and Plankian spectra,
* Correlated and Visual Color Temperatures, and CRI.
*/
#include <stdio.h>
#include <math.h>
#include "xspect.h"
#include "numlib.h"
#include "plot.h"
#include "ui.h"
#define PLANKIAN
#define XRES 500
#ifdef PLANKIAN
#define BBTYPE icxIT_Ptemp
#else
#define BBTYPE icxIT_Dtemp
#endif
static int do_spec(char *name, xspect *sp) {
int i;
double xyz[3]; /* Color temperature */
double Yxy[3];
double xx[XRES];
double y1[XRES];
double cct, vct;
double cct_xyz[3], vct_xyz[3];
double cct_lab[3], vct_lab[3];
icmXYZNumber wp;
double de;
printf("\n");
/* Compute XYZ of illuminant */
if (icx_ill_sp2XYZ(xyz, icxOT_CIE_1931_2, NULL, icxIT_custom, 0, sp) != 0)
error ("icx_sp_temp2XYZ returned error");
icmXYZ2Yxy(Yxy, xyz);
printf("Type = %s\n",name);
printf("XYZ = %f %f %f, x,y = %f %f\n", xyz[0], xyz[1], xyz[2], Yxy[1], Yxy[2]);
/* Compute CCT */
if ((cct = icx_XYZ2ill_ct(cct_xyz, BBTYPE, icxOT_CIE_1931_2, NULL, xyz, NULL, 0)) < 0)
error ("Got bad cct\n");
/* Compute VCT */
if ((vct = icx_XYZ2ill_ct(vct_xyz, BBTYPE, icxOT_CIE_1931_2, NULL, xyz, NULL, 1)) < 0)
error ("Got bad vct\n");
#ifdef PLANKIAN
printf("CCT = %f, VCT = %f\n",cct, vct);
#else
printf("CDT = %f, VDT = %f\n",cct, vct);
#endif
{
int invalid = 0;
double RR[14];
double cri;
cri = icx_CIE1995_CRI(&invalid, RR, sp);
printf("CRI = %.1f [ R9 = %.1f ]%s\n",cri,RR[9],invalid ? " (Invalid)" : "");
}
/* Use modern color difference - gives a better visual match */
icmAry2XYZ(wp, vct_xyz);
icmXYZ2Lab(&wp, cct_lab, cct_xyz);
icmXYZ2Lab(&wp, vct_lab, vct_xyz);
de = icmCIE2K(cct_lab, vct_lab);
printf("CIEDE2000 Delta E = %f\n",de);
/* Plot spectrum out */
for (i = 0; i < XRES; i++) {
double ww;
ww = (sp->spec_wl_long - sp->spec_wl_short)
* ((double)i/(XRES-1.0)) + sp->spec_wl_short;
xx[i] = ww;
y1[i] = value_xspect(sp, ww);
}
do_plot(xx,y1,NULL,NULL,i);
return 0;
}
void usage(void) {
fprintf(stderr,"Plot spectrum and calculate CCT and VCT\n");
fprintf(stderr,"Author: Graeme W. Gill\n");
fprintf(stderr,"usage: ccttest [infile.sp]\n");
fprintf(stderr," [infile.sp] spectrum to plot\n");
fprintf(stderr," default is all built in illuminants\n");
exit(1);
}
int
main(
int argc,
char *argv[]
) {
int fa,nfa; /* argument we're looking at */
int k;
int verb = 0;
char in_name[100] = { '\000' }; /* Spectrum name */
double temp;
xspect sp; /* Spectra */
icxIllumeType ilType;
char buf[200];
error_program = argv[0];
/* Process the arguments */
for(fa = 1;fa < argc;fa++) {
nfa = fa; /* skip to nfa if next argument is used */
if (argv[fa][0] == '-') { /* Look for any flags */
char *na = NULL; /* next argument after flag, null if none */
if (argv[fa][2] != '\000')
na = &argv[fa][2]; /* next is directly after flag */
else {
if ((fa+1) < argc) {
if (argv[fa+1][0] != '-') {
nfa = fa + 1;
na = argv[nfa]; /* next is seperate non-flag argument */
}
}
}
/* Verbosity */
if (argv[fa][1] == 'v' || argv[fa][1] == 'V') {
verb = 1;
} else {
usage();
}
}
else
break;
}
if (fa < argc && argv[fa][0] != '-')
strcpy(in_name,argv[fa]);
#ifndef NEVER /* hack test */
{
#define NTESTS 5
int i;
double cct, vct;
double de1, de2;
double xyz[NTESTS][3] = {
{ 92.250000, 97.750000, 89.650000 }, /* Rogers spotread verification result */
{ 94.197915, 97.686362, 80.560411, }, /* Rogers target */
{ 93.51, 97.12, 80.86 }, /* Rogers test ? */
{ 75.31, 78.20, 64.59 }, /* Mac LCD test */
{ 42.98, 44.62, 36.95 } /* Hitachie CRT test */
};
double axyz[3];
double lab[3], alab[3];
for (i = 0; i < NTESTS; i++) {
/* Compute CCT */
if ((cct = icx_XYZ2ill_ct(axyz, icxIT_Ptemp, icxOT_CIE_1931_2, NULL, xyz[i], NULL, 0)) < 0)
error ("Got bad cct\n");
axyz[0] /= axyz[1];
axyz[2] /= axyz[1];
axyz[1] /= axyz[1];
icmXYZ2Lab(&icmD50, alab, axyz);
axyz[0] = xyz[i][0] / xyz[i][1];
axyz[2] = xyz[i][2] / xyz[i][1];
axyz[1] = xyz[i][1] / xyz[i][1];
icmXYZ2Lab(&icmD50, lab, axyz);
de1 = icmCIE2K(lab, alab);
/* Compute VCT */
if ((vct = icx_XYZ2ill_ct(axyz, icxIT_Ptemp, icxOT_CIE_1931_2, NULL, xyz[i], NULL, 1)) < 0)
error ("Got bad vct\n");
axyz[0] /= axyz[1];
axyz[2] /= axyz[1];
axyz[1] /= axyz[1];
icmXYZ2Lab(&icmD50, alab, axyz);
axyz[0] = xyz[i][0] / xyz[i][1];
axyz[2] = xyz[i][2] / xyz[i][1];
axyz[1] = xyz[i][1] / xyz[i][1];
icmXYZ2Lab(&icmD50, lab, axyz);
de2 = icmCIE2K(lab, alab);
printf("XYZ %f %f %f, CCT = %f de %f, VCT = %f de %f\n",xyz[i][0], xyz[i][1], xyz[i][2], cct, de1, vct, de1);
/* Compute CCT */
if ((cct = icx_XYZ2ill_ct(axyz, icxIT_Dtemp, icxOT_CIE_1931_2, NULL, xyz[i], NULL, 0)) < 0)
error ("Got bad cct\n");
axyz[0] /= axyz[1];
axyz[2] /= axyz[1];
axyz[1] /= axyz[1];
icmXYZ2Lab(&icmD50, alab, axyz);
axyz[0] = xyz[i][0] / xyz[i][1];
axyz[2] = xyz[i][2] / xyz[i][1];
axyz[1] = xyz[i][1] / xyz[i][1];
icmXYZ2Lab(&icmD50, lab, axyz);
de1 = icmCIE2K(lab, alab);
/* Compute VCT */
if ((vct = icx_XYZ2ill_ct(axyz, icxIT_Dtemp, icxOT_CIE_1931_2, NULL, xyz[i], NULL, 1)) < 0)
error ("Got bad vct\n");
axyz[0] /= axyz[1];
axyz[2] /= axyz[1];
axyz[1] /= axyz[1];
icmXYZ2Lab(&icmD50, alab, axyz);
axyz[0] = xyz[i][0] / xyz[i][1];
axyz[2] = xyz[i][2] / xyz[i][1];
axyz[1] = xyz[i][1] / xyz[i][1];
icmXYZ2Lab(&icmD50, lab, axyz);
de2 = icmCIE2K(lab, alab);
printf("XYZ %f %f %f, CDT = %f de %f, VDT = %f de %f\n",xyz[i][0], xyz[i][1], xyz[i][2], cct, de1, vct, de2);
}
}
#endif
if (in_name[0] != '\000') {
inst_meas_type mt;
if (read_xspect(&sp, &mt, in_name) != 0)
error ("Unable to read custom spectrum '%s'",in_name);
if (mt != inst_mrt_none
&& mt != inst_mrt_emission
&& mt != inst_mrt_ambient
&& mt != inst_mrt_emission_flash
&& mt != inst_mrt_ambient_flash)
error("Custom illuminant '%s' is wrong measurement type",in_name);
sprintf(buf, "File '%s'",in_name);
do_spec(buf, &sp);
} else {
/* For each standard illuminant */
for (ilType = icxIT_A; ilType <= icxIT_F10; ilType++) {
char *inm = NULL;
switch (ilType) {
case icxIT_A:
inm = "A"; break;
case icxIT_C:
inm = "C"; break;
case icxIT_D50:
inm = "D50"; break;
case icxIT_D50M2:
inm = "D50M2"; break;
case icxIT_D65:
inm = "D65"; break;
case icxIT_F5:
inm = "F5"; break;
case icxIT_F8:
inm = "F8"; break;
case icxIT_F10:
inm = "F10"; break;
default:
inm = "Unknown"; break;
break;
}
if (standardIlluminant(&sp, ilType, 0) != 0)
error ("standardIlluminant returned error");
do_spec(inm, &sp);
}
/* For each material and illuminant */
for (temp = 2500; temp <= 9000; temp += 500) {
for (k = 0; k < 2; k++) {
ilType = k == 0 ? icxIT_Dtemp : icxIT_Ptemp;
if (standardIlluminant(&sp, ilType, temp) != 0)
error ("standardIlluminant returned error");
sprintf(buf, "%s at %f", k == 0 ? "Daylight" : "Black body", temp);
do_spec(buf, &sp);
}
}
}
return 0;
}
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