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root/radiance/ray/src/px/macbethcal.c
Revision: 2.26
Committed: Tue May 14 22:45:38 2013 UTC (10 years, 10 months ago) by greg
Content type: text/plain
Branch: MAIN
CVS Tags: rad4R2P2, rad5R0, rad4R2, rad4R2P1
Changes since 2.25: +26 -26 lines
Log Message:
Update MacBeth chart values to average of 30 charts

File Contents

# Content
1 #ifndef lint
2 static const char RCSid[] = "$Id: macbethcal.c,v 2.25 2008/11/10 19:08:19 greg Exp $";
3 #endif
4 /*
5 * Calibrate a scanned MacBeth Color Checker Chart
6 *
7 * Produce a .cal file suitable for use with pcomb,
8 * or .cwp file suitable for use with pcwarp.
9 *
10 * Warping code depends on conformance of COLOR and W3VEC types.
11 */
12
13 #include <stdio.h>
14 #include <math.h>
15 #include <time.h>
16
17 #include "platform.h"
18 #include "rtprocess.h"
19 #include "rtio.h"
20 #include "color.h"
21 #include "resolu.h"
22 #include "pmap.h"
23 #include "warp3d.h"
24 #include "mx3.h"
25
26 /* MacBeth colors */
27 #define DarkSkin 0
28 #define LightSkin 1
29 #define BlueSky 2
30 #define Foliage 3
31 #define BlueFlower 4
32 #define BluishGreen 5
33 #define Orange 6
34 #define PurplishBlue 7
35 #define ModerateRed 8
36 #define Purple 9
37 #define YellowGreen 10
38 #define OrangeYellow 11
39 #define Blue 12
40 #define Green 13
41 #define Red 14
42 #define Yellow 15
43 #define Magenta 16
44 #define Cyan 17
45 #define White 18
46 #define Neutral8 19
47 #define Neutral65 20
48 #define Neutral5 21
49 #define Neutral35 22
50 #define Black 23
51 /* computed from 10nm spectral measurements */
52 /* CIE 1931 2 degree obs, equal-energy white */
53 float mbxyY[24][3] = {
54 {0.421236, 0.361196, 0.103392}, /* DarkSkin */
55 {0.40868, 0.358157, 0.352867}, /* LightSkin */
56 {0.265063, 0.271424, 0.185124}, /* BlueSky */
57 {0.362851, 0.43055, 0.132625}, /* Foliage */
58 {0.28888, 0.260851, 0.233138}, /* BlueFlower */
59 {0.277642, 0.365326, 0.416443}, /* BluishGreen */
60 {0.524965, 0.40068, 0.312039}, /* Orange */
61 {0.225018, 0.190392, 0.114999}, /* PurplishBlue */
62 {0.487199, 0.315372, 0.198616}, /* ModerateRed */
63 {0.314245, 0.227231, 0.0646047}, /* Purple */
64 {0.396202, 0.489732, 0.440724}, /* YellowGreen */
65 {0.493297, 0.435299, 0.43444}, /* OrangeYellow */
66 {0.198191, 0.149265, 0.0588122}, /* Blue */
67 {0.322838, 0.487601, 0.229258}, /* Green */
68 {0.561833, 0.321165, 0.126978}, /* Red */
69 {0.468113, 0.467021, 0.605289}, /* Yellow */
70 {0.397128, 0.248535, 0.201761}, /* Magenta */
71 {0.209552, 0.276256, 0.190917}, /* Cyan */
72 {0.337219, 0.339042, 0.912482}, /* White */
73 {0.333283, 0.335077, 0.588297}, /* Neutral.8 */
74 {0.332747, 0.334371, 0.3594}, /* Neutral.65 */
75 {0.331925, 0.334202, 0.19114}, /* Neutral.5 */
76 {0.330408, 0.332615, 0.0892964}, /* Neutral.35 */
77 {0.331841, 0.331405, 0.0319541}, /* Black */
78 };
79
80 COLOR mbRGB[24]; /* MacBeth RGB values */
81
82 #define NMBNEU 6 /* Number of MacBeth neutral colors */
83 short mbneu[NMBNEU] = {Black,Neutral35,Neutral5,Neutral65,Neutral8,White};
84
85 #define NEUFLGS (1L<<White|1L<<Neutral8|1L<<Neutral65| \
86 1L<<Neutral5|1L<<Neutral35|1L<<Black)
87
88 #define SATFLGS (1L<<Red|1L<<Green|1L<<Blue|1L<<Magenta|1L<<Yellow| \
89 1L<<Cyan|1L<<Orange|1L<<Purple|1L<<PurplishBlue| \
90 1L<<YellowGreen|1<<OrangeYellow|1L<<BlueFlower)
91
92 #define UNSFLGS (1L<<DarkSkin|1L<<LightSkin|1L<<BlueSky|1L<<Foliage| \
93 1L<<BluishGreen|1L<<ModerateRed)
94
95 #define REQFLGS NEUFLGS /* need these colors */
96 #define MODFLGS (NEUFLGS|UNSFLGS) /* should be in gamut */
97
98 #define RG_BORD 0 /* patch border */
99 #define RG_CENT 01 /* central region of patch */
100 #define RG_ORIG 02 /* original color region */
101 #define RG_CORR 04 /* corrected color region */
102
103 #ifndef DISPCOM
104 #define DISPCOM "ximage -op \"%s\""
105 #endif
106
107 int scanning = 1; /* scanned input (or recorded output)? */
108 double irrad = 1.0; /* irradiance multiplication factor */
109 int rawmap = 0; /* put out raw color mapping? */
110
111 int xmax, ymax; /* input image dimensions */
112 int bounds[4][2]; /* image coordinates of chart corners */
113 double imgxfm[3][3]; /* coordinate transformation matrix */
114
115 COLOR inpRGB[24]; /* measured or scanned input colors */
116 long inpflags = 0; /* flags of which colors were input */
117 long gmtflags = 0; /* flags of out-of-gamut colors */
118
119 COLOR bramp[NMBNEU][2]; /* brightness ramp (per primary) */
120 COLORMAT solmat; /* color mapping matrix */
121 COLOR colmin, colmax; /* gamut limits */
122
123 WARP3D *wcor = NULL; /* color space warp */
124
125 FILE *debugfp = NULL; /* debug output picture */
126 char *progname;
127
128 static void init(void);
129 static int chartndx(int x, int y, int *np);
130 static void getpicture(void);
131 static void getcolors(void);
132 static void bresp(COLOR y, COLOR x);
133 static void compute(void);
134 static void putmapping(void);
135 static void compsoln(COLOR cin[], COLOR cout[], int n);
136 static void cwarp(void);
137 static int cvtcolor(COLOR cout, COLOR cin);
138 static int cresp(COLOR cout, COLOR cin);
139 static void xyY2RGB(COLOR rgbout, float xyYin[3]);
140 static void picdebug(void);
141 static void clrdebug(void);
142 static void getpos(char *name, int bnds[2], FILE *fp);
143 static void pickchartpos(char *pfn);
144
145
146 int
147 main(
148 int argc,
149 char **argv
150 )
151 {
152 int i;
153
154 progname = argv[0];
155 for (i = 1; i < argc && argv[i][0] == '-'; i++)
156 switch (argv[i][1]) {
157 case 'd': /* debug output */
158 i++;
159 if (badarg(argc-i, argv+i, "s"))
160 goto userr;
161 if ((debugfp = fopen(argv[i], "w")) == NULL) {
162 perror(argv[i]);
163 exit(1);
164 }
165 SET_FILE_BINARY(debugfp);
166 newheader("RADIANCE", debugfp); /* start */
167 printargs(argc, argv, debugfp); /* header */
168 break;
169 case 'p': /* picture position */
170 if (badarg(argc-i-1, argv+i+1, "iiiiiiii"))
171 goto userr;
172 bounds[0][0] = atoi(argv[++i]);
173 bounds[0][1] = atoi(argv[++i]);
174 bounds[1][0] = atoi(argv[++i]);
175 bounds[1][1] = atoi(argv[++i]);
176 bounds[2][0] = atoi(argv[++i]);
177 bounds[2][1] = atoi(argv[++i]);
178 bounds[3][0] = atoi(argv[++i]);
179 bounds[3][1] = atoi(argv[++i]);
180 scanning = 2;
181 break;
182 case 'P': /* pick position */
183 scanning = 3;
184 break;
185 case 'i': /* irradiance factor */
186 i++;
187 if (badarg(argc-i, argv+i, "f"))
188 goto userr;
189 irrad = atof(argv[i]);
190 break;
191 case 'm': /* raw map output */
192 rawmap = 1;
193 break;
194 case 'c': /* color input */
195 scanning = 0;
196 break;
197 default:
198 goto userr;
199 }
200 /* open files */
201 if (i < argc && freopen(argv[i], "r", stdin) == NULL) {
202 perror(argv[i]);
203 exit(1);
204 }
205 if (i+1 < argc && freopen(argv[i+1], "w", stdout) == NULL) {
206 perror(argv[i+1]);
207 exit(1);
208 }
209 if (scanning) { /* load input picture header */
210 SET_FILE_BINARY(stdin);
211 if (checkheader(stdin, COLRFMT, NULL) < 0 ||
212 fgetresolu(&xmax, &ymax, stdin) < 0) {
213 fprintf(stderr, "%s: bad input picture\n", progname);
214 exit(1);
215 }
216 if (scanning == 3) {
217 if (i >= argc)
218 goto userr;
219 pickchartpos(argv[i]);
220 scanning = 2;
221 }
222 } else { /* else set default xmax and ymax */
223 xmax = 512;
224 ymax = 2*512/3;
225 }
226 if (scanning != 2) { /* use default boundaries */
227 bounds[0][0] = bounds[2][0] = .029*xmax + .5;
228 bounds[0][1] = bounds[1][1] = .956*ymax + .5;
229 bounds[1][0] = bounds[3][0] = .971*xmax + .5;
230 bounds[2][1] = bounds[3][1] = .056*ymax + .5;
231 }
232 init(); /* initialize */
233 if (scanning) /* get picture colors */
234 getpicture();
235 else
236 getcolors();
237 compute(); /* compute color mapping */
238 if (rawmap) { /* print out raw correspondence */
239 register int j;
240
241 printf("# Color correspondence produced by:\n#\t\t");
242 printargs(argc, argv, stdout);
243 printf("#\tUsage: pcwarp %s uncorrected.hdr > corrected.hdr\n",
244 i+1 < argc ? argv[i+1] : "{this_file}");
245 printf("#\t Or: pcond [options] -m %s orig.hdr > output.hdr\n",
246 i+1 < argc ? argv[i+1] : "{this_file}");
247 for (j = 0; j < 24; j++)
248 printf("%f %f %f %f %f %f\n",
249 colval(inpRGB[j],RED), colval(inpRGB[j],GRN),
250 colval(inpRGB[j],BLU), colval(mbRGB[j],RED),
251 colval(mbRGB[j],GRN), colval(mbRGB[j],BLU));
252 if (scanning && debugfp != NULL)
253 cwarp(); /* color warp for debugging */
254 } else { /* print color mapping */
255 /* print header */
256 printf("{\n\tColor correction file computed by:\n\t\t");
257 printargs(argc, argv, stdout);
258 printf("\n\tUsage: pcomb -f %s uncorrected.hdr > corrected.hdr\n",
259 i+1 < argc ? argv[i+1] : "{this_file}");
260 if (!scanning)
261 printf("\t Or: pcond [options] -f %s orig.hdr > output.hdr\n",
262 i+1 < argc ? argv[i+1] : "{this_file}");
263 printf("}\n");
264 putmapping(); /* put out color mapping */
265 }
266 if (debugfp != NULL) { /* put out debug picture */
267 if (scanning)
268 picdebug();
269 else
270 clrdebug();
271 }
272 exit(0);
273 userr:
274 fprintf(stderr,
275 "Usage: %s [-d dbg.hdr][-P | -p xul yul xur yur xll yll xlr ylr][-i irrad][-m] input.hdr [output.{cal|cwp}]\n",
276 progname);
277 fprintf(stderr, " or: %s [-d dbg.hdr][-i irrad][-m] -c [xyY.dat [output.{cal|cwp}]]\n",
278 progname);
279 exit(1);
280 return 1; /* pro forma return */
281 }
282
283
284 static void
285 init(void) /* initialize */
286 {
287 double quad[4][2];
288 register int i;
289 /* make coordinate transformation */
290 quad[0][0] = bounds[0][0];
291 quad[0][1] = bounds[0][1];
292 quad[1][0] = bounds[1][0];
293 quad[1][1] = bounds[1][1];
294 quad[2][0] = bounds[3][0];
295 quad[2][1] = bounds[3][1];
296 quad[3][0] = bounds[2][0];
297 quad[3][1] = bounds[2][1];
298
299 if (pmap_quad_rect(0., 0., 6., 4., quad, imgxfm) == PMAP_BAD) {
300 fprintf(stderr, "%s: bad chart boundaries\n", progname);
301 exit(1);
302 }
303 /* map MacBeth colors to RGB space */
304 for (i = 0; i < 24; i++) {
305 xyY2RGB(mbRGB[i], mbxyY[i]);
306 scalecolor(mbRGB[i], irrad);
307 }
308 }
309
310
311 static int
312 chartndx( /* find color number for position */
313 int x,
314 int y,
315 int *np
316 )
317 {
318 double ipos[3], cpos[3];
319 int ix, iy;
320 double fx, fy;
321
322 ipos[0] = x;
323 ipos[1] = y;
324 ipos[2] = 1;
325 mx3d_transform(ipos, imgxfm, cpos);
326 cpos[0] /= cpos[2];
327 cpos[1] /= cpos[2];
328 if (cpos[0] < 0. || cpos[0] >= 6. || cpos[1] < 0. || cpos[1] >= 4.)
329 return(RG_BORD);
330 ix = cpos[0];
331 iy = cpos[1];
332 fx = cpos[0] - ix;
333 fy = cpos[1] - iy;
334 *np = iy*6 + ix;
335 if (fx >= 0.35 && fx < 0.65 && fy >= 0.35 && fy < 0.65)
336 return(RG_CENT);
337 if (fx < 0.05 || fx >= 0.95 || fy < 0.05 || fy >= 0.95)
338 return(RG_BORD);
339 if (fx >= 0.5) /* right side is corrected */
340 return(RG_CORR);
341 return(RG_ORIG); /* left side is original */
342 }
343
344
345 static void
346 getpicture(void) /* load in picture colors */
347 {
348 COLR *scanln;
349 COLOR pval;
350 int ccount[24];
351 double d;
352 int y, i;
353 register int x;
354
355 scanln = (COLR *)malloc(xmax*sizeof(COLR));
356 if (scanln == NULL) {
357 perror(progname);
358 exit(1);
359 }
360 for (i = 0; i < 24; i++) {
361 setcolor(inpRGB[i], 0., 0., 0.);
362 ccount[i] = 0;
363 }
364 for (y = ymax-1; y >= 0; y--) {
365 if (freadcolrs(scanln, xmax, stdin) < 0) {
366 fprintf(stderr, "%s: error reading input picture\n",
367 progname);
368 exit(1);
369 }
370 for (x = 0; x < xmax; x++)
371 if (chartndx(x, y, &i) == RG_CENT) {
372 colr_color(pval, scanln[x]);
373 addcolor(inpRGB[i], pval);
374 ccount[i]++;
375 }
376 }
377 for (i = 0; i < 24; i++) { /* compute averages */
378 if (ccount[i] == 0)
379 continue;
380 d = 1./ccount[i];
381 scalecolor(inpRGB[i], d);
382 inpflags |= 1L<<i;
383 }
384 free((void *)scanln);
385 }
386
387
388 static void
389 getcolors(void) /* get xyY colors from standard input */
390 {
391 int gotwhite = 0;
392 COLOR whiteclr;
393 int n;
394 float xyYin[3];
395
396 while (fgetval(stdin, 'i', &n) == 1) { /* read colors */
397 if ((n < 0) | (n > 24) ||
398 fgetval(stdin, 'f', &xyYin[0]) != 1 ||
399 fgetval(stdin, 'f', &xyYin[1]) != 1 ||
400 fgetval(stdin, 'f', &xyYin[2]) != 1 ||
401 (xyYin[0] < 0.) | (xyYin[1] < 0.) ||
402 xyYin[0] + xyYin[1] > 1.) {
403 fprintf(stderr, "%s: bad color input data\n",
404 progname);
405 exit(1);
406 }
407 if (n == 0) { /* calibration white */
408 xyY2RGB(whiteclr, xyYin);
409 gotwhite++;
410 } else { /* standard color */
411 n--;
412 xyY2RGB(inpRGB[n], xyYin);
413 inpflags |= 1L<<n;
414 }
415 }
416 /* normalize colors */
417 if (!gotwhite) {
418 if (!(inpflags & 1L<<White)) {
419 fprintf(stderr, "%s: missing input for White\n",
420 progname);
421 exit(1);
422 }
423 setcolor(whiteclr,
424 colval(inpRGB[White],RED)/colval(mbRGB[White],RED),
425 colval(inpRGB[White],GRN)/colval(mbRGB[White],GRN),
426 colval(inpRGB[White],BLU)/colval(mbRGB[White],BLU));
427 }
428 for (n = 0; n < 24; n++)
429 if (inpflags & 1L<<n)
430 setcolor(inpRGB[n],
431 colval(inpRGB[n],RED)/colval(whiteclr,RED),
432 colval(inpRGB[n],GRN)/colval(whiteclr,GRN),
433 colval(inpRGB[n],BLU)/colval(whiteclr,BLU));
434 }
435
436
437 static void
438 bresp( /* piecewise linear interpolation of primaries */
439 COLOR y,
440 COLOR x
441 )
442 {
443 register int i, n;
444
445 for (i = 0; i < 3; i++) {
446 for (n = 0; n < NMBNEU-2; n++)
447 if (colval(x,i) < colval(bramp[n+1][0],i))
448 break;
449 colval(y,i) = ((colval(bramp[n+1][0],i) - colval(x,i)) *
450 colval(bramp[n][1],i) +
451 (colval(x,i) - colval(bramp[n][0],i)) *
452 colval(bramp[n+1][1],i)) /
453 (colval(bramp[n+1][0],i) - colval(bramp[n][0],i));
454 }
455 }
456
457
458 static void
459 compute(void) /* compute color mapping */
460 {
461 COLOR clrin[24], clrout[24];
462 long cflags;
463 COLOR ctmp;
464 register int i, n;
465 /* did we get what we need? */
466 if ((inpflags & REQFLGS) != REQFLGS) {
467 fprintf(stderr, "%s: missing required input colors\n",
468 progname);
469 exit(1);
470 }
471 /* compute piecewise luminance curve */
472 for (i = 0; i < NMBNEU; i++) {
473 copycolor(bramp[i][0], inpRGB[mbneu[i]]);
474 for (n = i ? 3 : 0; n--; )
475 if (colval(bramp[i][0],n) <=
476 colval(bramp[i-1][0],n)+1e-7) {
477 fprintf(stderr,
478 "%s: non-increasing neutral patch\n", progname);
479 exit(1);
480 }
481 copycolor(bramp[i][1], mbRGB[mbneu[i]]);
482 }
483 /* compute color space gamut */
484 if (scanning) {
485 copycolor(colmin, cblack);
486 copycolor(colmax, cwhite);
487 scalecolor(colmax, irrad);
488 } else
489 for (i = 0; i < 3; i++) {
490 colval(colmin,i) = colval(bramp[0][0],i) -
491 colval(bramp[0][1],i) *
492 (colval(bramp[1][0],i)-colval(bramp[0][0],i)) /
493 (colval(bramp[1][1],i)-colval(bramp[1][0],i));
494 colval(colmax,i) = colval(bramp[NMBNEU-2][0],i) +
495 (1.-colval(bramp[NMBNEU-2][1],i)) *
496 (colval(bramp[NMBNEU-1][0],i) -
497 colval(bramp[NMBNEU-2][0],i)) /
498 (colval(bramp[NMBNEU-1][1],i) -
499 colval(bramp[NMBNEU-2][1],i));
500 }
501 /* compute color mapping */
502 do {
503 cflags = inpflags & ~gmtflags;
504 n = 0; /* compute transform matrix */
505 for (i = 0; i < 24; i++)
506 if (cflags & 1L<<i) {
507 bresp(clrin[n], inpRGB[i]);
508 copycolor(clrout[n], mbRGB[i]);
509 n++;
510 }
511 compsoln(clrin, clrout, n);
512 if (irrad > 0.99 && irrad < 1.01) /* check gamut */
513 for (i = 0; i < 24; i++)
514 if (cflags & 1L<<i && cvtcolor(ctmp, mbRGB[i]))
515 gmtflags |= 1L<<i;
516 } while (cflags & gmtflags);
517 if (gmtflags & MODFLGS)
518 fprintf(stderr,
519 "%s: warning - some moderate colors are out of gamut\n",
520 progname);
521 }
522
523
524 static void
525 putmapping(void) /* put out color mapping */
526 {
527 static char cchar[3] = {'r', 'g', 'b'};
528 register int i, j;
529 /* print brightness mapping */
530 for (j = 0; j < 3; j++) {
531 printf("%cxa(i) : select(i", cchar[j]);
532 for (i = 0; i < NMBNEU; i++)
533 printf(",%g", colval(bramp[i][0],j));
534 printf(");\n");
535 printf("%cya(i) : select(i", cchar[j]);
536 for (i = 0; i < NMBNEU; i++)
537 printf(",%g", colval(bramp[i][1],j));
538 printf(");\n");
539 printf("%cfi(n) = if(n-%g, %d, if(%cxa(n+1)-%c, n, %cfi(n+1)));\n",
540 cchar[j], NMBNEU-1.5, NMBNEU-1, cchar[j],
541 cchar[j], cchar[j]);
542 printf("%cndx = %cfi(1);\n", cchar[j], cchar[j]);
543 printf("%c%c = ((%cxa(%cndx+1)-%c)*%cya(%cndx) + ",
544 cchar[j], scanning?'n':'o', cchar[j],
545 cchar[j], cchar[j], cchar[j], cchar[j]);
546 printf("(%c-%cxa(%cndx))*%cya(%cndx+1)) /\n",
547 cchar[j], cchar[j], cchar[j],
548 cchar[j], cchar[j]);
549 printf("\t\t(%cxa(%cndx+1) - %cxa(%cndx)) ;\n",
550 cchar[j], cchar[j], cchar[j], cchar[j]);
551 }
552 /* print color mapping */
553 if (scanning) {
554 printf("r = ri(1); g = gi(1); b = bi(1);\n");
555 printf("ro = %g*rn + %g*gn + %g*bn ;\n",
556 solmat[0][0], solmat[0][1], solmat[0][2]);
557 printf("go = %g*rn + %g*gn + %g*bn ;\n",
558 solmat[1][0], solmat[1][1], solmat[1][2]);
559 printf("bo = %g*rn + %g*gn + %g*bn ;\n",
560 solmat[2][0], solmat[2][1], solmat[2][2]);
561 } else {
562 printf("r1 = ri(1); g1 = gi(1); b1 = bi(1);\n");
563 printf("r = %g*r1 + %g*g1 + %g*b1 ;\n",
564 solmat[0][0], solmat[0][1], solmat[0][2]);
565 printf("g = %g*r1 + %g*g1 + %g*b1 ;\n",
566 solmat[1][0], solmat[1][1], solmat[1][2]);
567 printf("b = %g*r1 + %g*g1 + %g*b1 ;\n",
568 solmat[2][0], solmat[2][1], solmat[2][2]);
569 }
570 }
571
572
573 static void
574 compsoln( /* solve 3xN system using least-squares */
575 COLOR cin[],
576 COLOR cout[],
577 int n
578 )
579 {
580 extern double mx3d_adjoint(), fabs();
581 double mat[3][3], invmat[3][3];
582 double det;
583 double colv[3], rowv[3];
584 register int i, j, k;
585
586 if (n < 3) {
587 fprintf(stderr, "%s: too few colors to match!\n", progname);
588 exit(1);
589 }
590 if (n == 3)
591 for (i = 0; i < 3; i++)
592 for (j = 0; j < 3; j++)
593 mat[i][j] = colval(cin[j],i);
594 else { /* compute A^t A */
595 for (i = 0; i < 3; i++)
596 for (j = i; j < 3; j++) {
597 mat[i][j] = 0.;
598 for (k = 0; k < n; k++)
599 mat[i][j] += colval(cin[k],i) *
600 colval(cin[k],j);
601 }
602 for (i = 1; i < 3; i++) /* using symmetry */
603 for (j = 0; j < i; j++)
604 mat[i][j] = mat[j][i];
605 }
606 det = mx3d_adjoint(mat, invmat);
607 if (fabs(det) < 1e-4) {
608 fprintf(stderr, "%s: cannot compute color mapping\n",
609 progname);
610 solmat[0][0] = solmat[1][1] = solmat[2][2] = 1.;
611 solmat[0][1] = solmat[0][2] = solmat[1][0] =
612 solmat[1][2] = solmat[2][0] = solmat[2][1] = 0.;
613 return;
614 }
615 for (i = 0; i < 3; i++)
616 for (j = 0; j < 3; j++)
617 invmat[i][j] /= det;
618 for (i = 0; i < 3; i++) {
619 if (n == 3)
620 for (j = 0; j < 3; j++)
621 colv[j] = colval(cout[j],i);
622 else
623 for (j = 0; j < 3; j++) {
624 colv[j] = 0.;
625 for (k = 0; k < n; k++)
626 colv[j] += colval(cout[k],i) *
627 colval(cin[k],j);
628 }
629 mx3d_transform(colv, invmat, rowv);
630 for (j = 0; j < 3; j++)
631 solmat[i][j] = rowv[j];
632 }
633 }
634
635
636 static void
637 cwarp(void) /* compute color warp map */
638 {
639 register int i;
640
641 if ((wcor = new3dw(W3EXACT)) == NULL)
642 goto memerr;
643 for (i = 0; i < 24; i++)
644 if (!add3dpt(wcor, inpRGB[i], mbRGB[i]))
645 goto memerr;
646 return;
647 memerr:
648 perror(progname);
649 exit(1);
650 }
651
652
653 static int
654 cvtcolor( /* convert color according to our mapping */
655 COLOR cout,
656 COLOR cin
657 )
658 {
659 COLOR ctmp;
660 int clipped;
661
662 if (wcor != NULL) {
663 clipped = warp3d(cout, cin, wcor);
664 clipped |= clipgamut(cout,bright(cout),CGAMUT,colmin,colmax);
665 } else if (scanning) {
666 bresp(ctmp, cin);
667 clipped = cresp(cout, ctmp);
668 } else {
669 clipped = cresp(ctmp, cin);
670 bresp(cout, ctmp);
671 }
672 return(clipped);
673 }
674
675
676 static int
677 cresp( /* transform color according to matrix */
678 COLOR cout,
679 COLOR cin
680 )
681 {
682 colortrans(cout, solmat, cin);
683 return(clipgamut(cout, bright(cout), CGAMUT, colmin, colmax));
684 }
685
686
687 static void
688 xyY2RGB( /* convert xyY to RGB */
689 COLOR rgbout,
690 register float xyYin[3]
691 )
692 {
693 COLOR ctmp;
694 double d;
695
696 d = xyYin[2] / xyYin[1];
697 ctmp[0] = xyYin[0] * d;
698 ctmp[1] = xyYin[2];
699 ctmp[2] = (1. - xyYin[0] - xyYin[1]) * d;
700 /* allow negative values */
701 colortrans(rgbout, xyz2rgbmat, ctmp);
702 }
703
704
705 static void
706 picdebug(void) /* put out debugging picture */
707 {
708 static COLOR blkcol = BLKCOLOR;
709 COLOR *scan;
710 int y, i;
711 register int x, rg;
712
713 if (fseek(stdin, 0L, 0) == EOF) {
714 fprintf(stderr, "%s: cannot seek on input picture\n", progname);
715 exit(1);
716 }
717 getheader(stdin, NULL, NULL); /* skip input header */
718 fgetresolu(&xmax, &ymax, stdin);
719 /* allocate scanline */
720 scan = (COLOR *)malloc(xmax*sizeof(COLOR));
721 if (scan == NULL) {
722 perror(progname);
723 exit(1);
724 }
725 /* finish debug header */
726 fputformat(COLRFMT, debugfp);
727 putc('\n', debugfp);
728 fprtresolu(xmax, ymax, debugfp);
729 /* write debug picture */
730 for (y = ymax-1; y >= 0; y--) {
731 if (freadscan(scan, xmax, stdin) < 0) {
732 fprintf(stderr, "%s: error rereading input picture\n",
733 progname);
734 exit(1);
735 }
736 for (x = 0; x < xmax; x++) {
737 rg = chartndx(x, y, &i);
738 if (rg == RG_CENT) {
739 if (!(1L<<i & gmtflags) || (x+y)&07) {
740 copycolor(scan[x], mbRGB[i]);
741 clipgamut(scan[x], bright(scan[x]),
742 CGAMUT, colmin, colmax);
743 } else
744 copycolor(scan[x], blkcol);
745 } else if (rg == RG_CORR)
746 cvtcolor(scan[x], scan[x]);
747 else if (rg != RG_ORIG)
748 copycolor(scan[x], blkcol);
749 }
750 if (fwritescan(scan, xmax, debugfp) < 0) {
751 fprintf(stderr, "%s: error writing debugging picture\n",
752 progname);
753 exit(1);
754 }
755 }
756 /* clean up */
757 fclose(debugfp);
758 free((void *)scan);
759 }
760
761
762 static void
763 clrdebug(void) /* put out debug picture from color input */
764 {
765 static COLR blkclr = BLKCOLR;
766 COLR mbclr[24], cvclr[24], orclr[24];
767 COLR *scan;
768 COLOR ctmp, ct2;
769 int y, i;
770 register int x, rg;
771 /* convert colors */
772 for (i = 0; i < 24; i++) {
773 copycolor(ctmp, mbRGB[i]);
774 clipgamut(ctmp, bright(ctmp), CGAMUT, cblack, cwhite);
775 setcolr(mbclr[i], colval(ctmp,RED),
776 colval(ctmp,GRN), colval(ctmp,BLU));
777 if (inpflags & 1L<<i) {
778 copycolor(ctmp, inpRGB[i]);
779 clipgamut(ctmp, bright(ctmp), CGAMUT, cblack, cwhite);
780 setcolr(orclr[i], colval(ctmp,RED),
781 colval(ctmp,GRN), colval(ctmp,BLU));
782 if (rawmap)
783 copycolr(cvclr[i], mbclr[i]);
784 else {
785 bresp(ctmp, inpRGB[i]);
786 colortrans(ct2, solmat, ctmp);
787 clipgamut(ct2, bright(ct2), CGAMUT,
788 cblack, cwhite);
789 setcolr(cvclr[i], colval(ct2,RED),
790 colval(ct2,GRN),
791 colval(ct2,BLU));
792 }
793 }
794 }
795 /* allocate scanline */
796 scan = (COLR *)malloc(xmax*sizeof(COLR));
797 if (scan == NULL) {
798 perror(progname);
799 exit(1);
800 }
801 /* finish debug header */
802 fputformat(COLRFMT, debugfp);
803 putc('\n', debugfp);
804 fprtresolu(xmax, ymax, debugfp);
805 /* write debug picture */
806 for (y = ymax-1; y >= 0; y--) {
807 for (x = 0; x < xmax; x++) {
808 rg = chartndx(x, y, &i);
809 if (rg == RG_CENT) {
810 if (!(1L<<i & gmtflags) || (x+y)&07)
811 copycolr(scan[x], mbclr[i]);
812 else
813 copycolr(scan[x], blkclr);
814 } else if (rg == RG_BORD || !(1L<<i & inpflags))
815 copycolr(scan[x], blkclr);
816 else if (rg == RG_ORIG)
817 copycolr(scan[x], orclr[i]);
818 else /* rg == RG_CORR */
819 copycolr(scan[x], cvclr[i]);
820 }
821 if (fwritecolrs(scan, xmax, debugfp) < 0) {
822 fprintf(stderr, "%s: error writing debugging picture\n",
823 progname);
824 exit(1);
825 }
826 }
827 /* clean up */
828 fclose(debugfp);
829 free((void *)scan);
830 }
831
832
833 static void
834 getpos( /* get boundary position */
835 char *name,
836 int bnds[2],
837 FILE *fp
838 )
839 {
840 char buf[64];
841
842 fprintf(stderr, "\tSelect corner: %s\n", name);
843 if (fgets(buf, sizeof(buf), fp) == NULL ||
844 sscanf(buf, "%d %d", &bnds[0], &bnds[1]) != 2) {
845 fprintf(stderr, "%s: read error from display process\n",
846 progname);
847 exit(1);
848 }
849 }
850
851
852 static void
853 pickchartpos( /* display picture and pick chart location */
854 char *pfn
855 )
856 {
857 char combuf[PATH_MAX];
858 FILE *pfp;
859
860 sprintf(combuf, DISPCOM, pfn);
861 if ((pfp = popen(combuf, "r")) == NULL) {
862 perror(combuf);
863 exit(1);
864 }
865 fputs("Use middle mouse button to select chart corners:\n", stderr);
866 getpos("upper left (dark skin)", bounds[0], pfp);
867 getpos("upper right (bluish green)", bounds[1], pfp);
868 getpos("lower left (white)", bounds[2], pfp);
869 getpos("lower right (black)", bounds[3], pfp);
870 fputs("Got it -- quit display program.\n", stderr);
871 pclose(pfp);
872 }