1 |
#ifndef lint |
2 |
static const char RCSid[] = "$Id$"; |
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 |
#ifdef MSDOS |
16 |
#include <fcntl.h> |
17 |
#endif |
18 |
#include <time.h> |
19 |
#include "color.h" |
20 |
#include "resolu.h" |
21 |
#include "pmap.h" |
22 |
#include "warp3d.h" |
23 |
|
24 |
/* MacBeth colors */ |
25 |
#define DarkSkin 0 |
26 |
#define LightSkin 1 |
27 |
#define BlueSky 2 |
28 |
#define Foliage 3 |
29 |
#define BlueFlower 4 |
30 |
#define BluishGreen 5 |
31 |
#define Orange 6 |
32 |
#define PurplishBlue 7 |
33 |
#define ModerateRed 8 |
34 |
#define Purple 9 |
35 |
#define YellowGreen 10 |
36 |
#define OrangeYellow 11 |
37 |
#define Blue 12 |
38 |
#define Green 13 |
39 |
#define Red 14 |
40 |
#define Yellow 15 |
41 |
#define Magenta 16 |
42 |
#define Cyan 17 |
43 |
#define White 18 |
44 |
#define Neutral8 19 |
45 |
#define Neutral65 20 |
46 |
#define Neutral5 21 |
47 |
#define Neutral35 22 |
48 |
#define Black 23 |
49 |
/* computed from 5nm spectral measurements */ |
50 |
/* CIE 1931 2 degree obs, equal-energy white */ |
51 |
float mbxyY[24][3] = { |
52 |
{0.462, 0.3769, 0.0932961}, /* DarkSkin */ |
53 |
{0.4108, 0.3542, 0.410348}, /* LightSkin */ |
54 |
{0.2626, 0.267, 0.181554}, /* BlueSky */ |
55 |
{0.36, 0.4689, 0.108447}, /* Foliage */ |
56 |
{0.2977, 0.2602, 0.248407}, /* BlueFlower */ |
57 |
{0.2719, 0.3485, 0.401156}, /* BluishGreen */ |
58 |
{0.52, 0.4197, 0.357899}, /* Orange */ |
59 |
{0.229, 0.1866, 0.103911}, /* PurplishBlue */ |
60 |
{0.4909, 0.3262, 0.242615}, /* ModerateRed */ |
61 |
{0.3361, 0.2249, 0.0600102}, /* Purple */ |
62 |
{0.3855, 0.4874, 0.42963}, /* YellowGreen */ |
63 |
{0.4853, 0.4457, 0.476343}, /* OrangeYellow */ |
64 |
{0.2026, 0.1369, 0.0529249}, /* Blue */ |
65 |
{0.3007, 0.4822, 0.221226}, /* Green */ |
66 |
{0.5805, 0.3238, 0.162167}, /* Red */ |
67 |
{0.4617, 0.472, 0.64909}, /* Yellow */ |
68 |
{0.4178, 0.2625, 0.233662}, /* Magenta */ |
69 |
{0.2038, 0.2508, 0.167275}, /* Cyan */ |
70 |
{0.3358, 0.337, 0.916877}, /* White */ |
71 |
{0.3338, 0.3348, 0.604678}, /* Neutral.8 */ |
72 |
{0.3333, 0.3349, 0.364566}, /* Neutral.65 */ |
73 |
{0.3353, 0.3359, 0.200238}, /* Neutral.5 */ |
74 |
{0.3363, 0.336, 0.0878721}, /* Neutral.35 */ |
75 |
{0.3346, 0.3349, 0.0308383} /* Black */ |
76 |
}; |
77 |
|
78 |
COLOR mbRGB[24]; /* MacBeth RGB values */ |
79 |
|
80 |
#define NMBNEU 6 /* Number of MacBeth neutral colors */ |
81 |
short mbneu[NMBNEU] = {Black,Neutral35,Neutral5,Neutral65,Neutral8,White}; |
82 |
|
83 |
#define NEUFLGS (1L<<White|1L<<Neutral8|1L<<Neutral65| \ |
84 |
1L<<Neutral5|1L<<Neutral35|1L<<Black) |
85 |
|
86 |
#define SATFLGS (1L<<Red|1L<<Green|1L<<Blue|1L<<Magenta|1L<<Yellow| \ |
87 |
1L<<Cyan|1L<<Orange|1L<<Purple|1L<<PurplishBlue| \ |
88 |
1L<<YellowGreen|1<<OrangeYellow|1L<<BlueFlower) |
89 |
|
90 |
#define UNSFLGS (1L<<DarkSkin|1L<<LightSkin|1L<<BlueSky|1L<<Foliage| \ |
91 |
1L<<BluishGreen|1L<<ModerateRed) |
92 |
|
93 |
#define REQFLGS NEUFLGS /* need these colors */ |
94 |
#define MODFLGS (NEUFLGS|UNSFLGS) /* should be in gamut */ |
95 |
|
96 |
#define RG_BORD 0 /* patch border */ |
97 |
#define RG_CENT 01 /* central region of patch */ |
98 |
#define RG_ORIG 02 /* original color region */ |
99 |
#define RG_CORR 04 /* corrected color region */ |
100 |
|
101 |
#ifndef DISPCOM |
102 |
#define DISPCOM "ximage -op %s" |
103 |
#endif |
104 |
|
105 |
int scanning = 1; /* scanned input (or recorded output)? */ |
106 |
double irrad = 1.0; /* irradiance multiplication factor */ |
107 |
int rawmap = 0; /* put out raw color mapping? */ |
108 |
|
109 |
int xmax, ymax; /* input image dimensions */ |
110 |
int bounds[4][2]; /* image coordinates of chart corners */ |
111 |
double imgxfm[3][3]; /* coordinate transformation matrix */ |
112 |
|
113 |
COLOR inpRGB[24]; /* measured or scanned input colors */ |
114 |
long inpflags = 0; /* flags of which colors were input */ |
115 |
long gmtflags = 0; /* flags of out-of-gamut colors */ |
116 |
|
117 |
COLOR bramp[NMBNEU][2]; /* brightness ramp (per primary) */ |
118 |
COLORMAT solmat; /* color mapping matrix */ |
119 |
COLOR colmin, colmax; /* gamut limits */ |
120 |
|
121 |
WARP3D *wcor = NULL; /* color space warp */ |
122 |
|
123 |
FILE *debugfp = NULL; /* debug output picture */ |
124 |
char *progname; |
125 |
|
126 |
|
127 |
main(argc, argv) |
128 |
int argc; |
129 |
char **argv; |
130 |
{ |
131 |
int i; |
132 |
|
133 |
progname = argv[0]; |
134 |
for (i = 1; i < argc && argv[i][0] == '-'; i++) |
135 |
switch (argv[i][1]) { |
136 |
case 'd': /* debug output */ |
137 |
i++; |
138 |
if (badarg(argc-i, argv+i, "s")) |
139 |
goto userr; |
140 |
if ((debugfp = fopen(argv[i], "w")) == NULL) { |
141 |
perror(argv[i]); |
142 |
exit(1); |
143 |
} |
144 |
#ifdef MSDOS |
145 |
setmode(fileno(debugfp), O_BINARY); |
146 |
#endif |
147 |
newheader("RADIANCE", debugfp); /* start */ |
148 |
printargs(argc, argv, debugfp); /* header */ |
149 |
break; |
150 |
case 'p': /* picture position */ |
151 |
if (badarg(argc-i-1, argv+i+1, "iiiiiiii")) |
152 |
goto userr; |
153 |
bounds[0][0] = atoi(argv[++i]); |
154 |
bounds[0][1] = atoi(argv[++i]); |
155 |
bounds[1][0] = atoi(argv[++i]); |
156 |
bounds[1][1] = atoi(argv[++i]); |
157 |
bounds[2][0] = atoi(argv[++i]); |
158 |
bounds[2][1] = atoi(argv[++i]); |
159 |
bounds[3][0] = atoi(argv[++i]); |
160 |
bounds[3][1] = atoi(argv[++i]); |
161 |
scanning = 2; |
162 |
break; |
163 |
case 'P': /* pick position */ |
164 |
scanning = 3; |
165 |
break; |
166 |
case 'i': /* irradiance factor */ |
167 |
i++; |
168 |
if (badarg(argc-i, argv+i, "f")) |
169 |
goto userr; |
170 |
irrad = atof(argv[i]); |
171 |
break; |
172 |
case 'm': /* raw map output */ |
173 |
rawmap = 1; |
174 |
break; |
175 |
case 'c': /* color input */ |
176 |
scanning = 0; |
177 |
break; |
178 |
default: |
179 |
goto userr; |
180 |
} |
181 |
/* open files */ |
182 |
if (i < argc && freopen(argv[i], "r", stdin) == NULL) { |
183 |
perror(argv[i]); |
184 |
exit(1); |
185 |
} |
186 |
if (i+1 < argc && freopen(argv[i+1], "w", stdout) == NULL) { |
187 |
perror(argv[i+1]); |
188 |
exit(1); |
189 |
} |
190 |
if (scanning) { /* load input picture header */ |
191 |
#ifdef MSDOS |
192 |
setmode(fileno(stdin), O_BINARY); |
193 |
#endif |
194 |
if (checkheader(stdin, COLRFMT, NULL) < 0 || |
195 |
fgetresolu(&xmax, &ymax, stdin) < 0) { |
196 |
fprintf(stderr, "%s: bad input picture\n", progname); |
197 |
exit(1); |
198 |
} |
199 |
if (scanning == 3) { |
200 |
if (i >= argc) |
201 |
goto userr; |
202 |
pickchartpos(argv[i]); |
203 |
scanning = 2; |
204 |
} |
205 |
} else { /* else set default xmax and ymax */ |
206 |
xmax = 512; |
207 |
ymax = 2*512/3; |
208 |
} |
209 |
if (scanning != 2) { /* use default boundaries */ |
210 |
bounds[0][0] = bounds[2][0] = .029*xmax + .5; |
211 |
bounds[0][1] = bounds[1][1] = .956*ymax + .5; |
212 |
bounds[1][0] = bounds[3][0] = .971*xmax + .5; |
213 |
bounds[2][1] = bounds[3][1] = .056*ymax + .5; |
214 |
} |
215 |
init(); /* initialize */ |
216 |
if (scanning) /* get picture colors */ |
217 |
getpicture(); |
218 |
else |
219 |
getcolors(); |
220 |
compute(); /* compute color mapping */ |
221 |
if (rawmap) { /* print out raw correspondence */ |
222 |
register int j; |
223 |
|
224 |
printf("# Color correspondence produced by:\n#\t\t"); |
225 |
printargs(argc, argv, stdout); |
226 |
printf("#\tUsage: pcwarp %s uncorrected.pic > corrected.pic\n", |
227 |
i+1 < argc ? argv[i+1] : "{this_file}"); |
228 |
printf("#\t Or: pcond [options] -m %s orig.pic > output.pic\n", |
229 |
i+1 < argc ? argv[i+1] : "{this_file}"); |
230 |
for (j = 0; j < 24; j++) |
231 |
printf("%f %f %f %f %f %f\n", |
232 |
colval(inpRGB[j],RED), colval(inpRGB[j],GRN), |
233 |
colval(inpRGB[j],BLU), colval(mbRGB[j],RED), |
234 |
colval(mbRGB[j],GRN), colval(mbRGB[j],BLU)); |
235 |
if (scanning && debugfp != NULL) |
236 |
cwarp(); /* color warp for debugging */ |
237 |
} else { /* print color mapping */ |
238 |
/* print header */ |
239 |
printf("{\n\tColor correction file computed by:\n\t\t"); |
240 |
printargs(argc, argv, stdout); |
241 |
printf("\n\tUsage: pcomb -f %s uncorrected.pic > corrected.pic\n", |
242 |
i+1 < argc ? argv[i+1] : "{this_file}"); |
243 |
if (!scanning) |
244 |
printf("\t Or: pcond [options] -f %s orig.pic > output.pic\n", |
245 |
i+1 < argc ? argv[i+1] : "{this_file}"); |
246 |
printf("}\n"); |
247 |
putmapping(); /* put out color mapping */ |
248 |
} |
249 |
if (debugfp != NULL) /* put out debug picture */ |
250 |
if (scanning) |
251 |
picdebug(); |
252 |
else |
253 |
clrdebug(); |
254 |
exit(0); |
255 |
userr: |
256 |
fprintf(stderr, |
257 |
"Usage: %s [-d dbg.pic][-P | -p xul yul xur yur xll yll xlr ylr][-i irrad][-m] input.pic [output.{cal|cwp}]\n", |
258 |
progname); |
259 |
fprintf(stderr, " or: %s [-d dbg.pic][-i irrad][-m] -c [xyY.dat [output.{cal|cwp}]]\n", |
260 |
progname); |
261 |
exit(1); |
262 |
} |
263 |
|
264 |
|
265 |
init() /* initialize */ |
266 |
{ |
267 |
double quad[4][2]; |
268 |
register int i; |
269 |
/* make coordinate transformation */ |
270 |
quad[0][0] = bounds[0][0]; |
271 |
quad[0][1] = bounds[0][1]; |
272 |
quad[1][0] = bounds[1][0]; |
273 |
quad[1][1] = bounds[1][1]; |
274 |
quad[2][0] = bounds[3][0]; |
275 |
quad[2][1] = bounds[3][1]; |
276 |
quad[3][0] = bounds[2][0]; |
277 |
quad[3][1] = bounds[2][1]; |
278 |
|
279 |
if (pmap_quad_rect(0., 0., 6., 4., quad, imgxfm) == PMAP_BAD) { |
280 |
fprintf(stderr, "%s: bad chart boundaries\n", progname); |
281 |
exit(1); |
282 |
} |
283 |
/* map MacBeth colors to RGB space */ |
284 |
for (i = 0; i < 24; i++) { |
285 |
xyY2RGB(mbRGB[i], mbxyY[i]); |
286 |
scalecolor(mbRGB[i], irrad); |
287 |
} |
288 |
} |
289 |
|
290 |
|
291 |
int |
292 |
chartndx(x, y, np) /* find color number for position */ |
293 |
int x, y; |
294 |
int *np; |
295 |
{ |
296 |
double ipos[3], cpos[3]; |
297 |
int ix, iy; |
298 |
double fx, fy; |
299 |
|
300 |
ipos[0] = x; |
301 |
ipos[1] = y; |
302 |
ipos[2] = 1; |
303 |
mx3d_transform(ipos, imgxfm, cpos); |
304 |
cpos[0] /= cpos[2]; |
305 |
cpos[1] /= cpos[2]; |
306 |
if (cpos[0] < 0. || cpos[0] >= 6. || cpos[1] < 0. || cpos[1] >= 4.) |
307 |
return(RG_BORD); |
308 |
ix = cpos[0]; |
309 |
iy = cpos[1]; |
310 |
fx = cpos[0] - ix; |
311 |
fy = cpos[1] - iy; |
312 |
*np = iy*6 + ix; |
313 |
if (fx >= 0.35 && fx < 0.65 && fy >= 0.35 && fy < 0.65) |
314 |
return(RG_CENT); |
315 |
if (fx < 0.05 || fx >= 0.95 || fy < 0.05 || fy >= 0.95) |
316 |
return(RG_BORD); |
317 |
if (fx >= 0.5) /* right side is corrected */ |
318 |
return(RG_CORR); |
319 |
return(RG_ORIG); /* left side is original */ |
320 |
} |
321 |
|
322 |
|
323 |
getpicture() /* load in picture colors */ |
324 |
{ |
325 |
COLR *scanln; |
326 |
COLOR pval; |
327 |
int ccount[24]; |
328 |
double d; |
329 |
int y, i; |
330 |
register int x; |
331 |
|
332 |
scanln = (COLR *)malloc(xmax*sizeof(COLR)); |
333 |
if (scanln == NULL) { |
334 |
perror(progname); |
335 |
exit(1); |
336 |
} |
337 |
for (i = 0; i < 24; i++) { |
338 |
setcolor(inpRGB[i], 0., 0., 0.); |
339 |
ccount[i] = 0; |
340 |
} |
341 |
for (y = ymax-1; y >= 0; y--) { |
342 |
if (freadcolrs(scanln, xmax, stdin) < 0) { |
343 |
fprintf(stderr, "%s: error reading input picture\n", |
344 |
progname); |
345 |
exit(1); |
346 |
} |
347 |
for (x = 0; x < xmax; x++) |
348 |
if (chartndx(x, y, &i) == RG_CENT) { |
349 |
colr_color(pval, scanln[x]); |
350 |
addcolor(inpRGB[i], pval); |
351 |
ccount[i]++; |
352 |
} |
353 |
} |
354 |
for (i = 0; i < 24; i++) { /* compute averages */ |
355 |
if (ccount[i] == 0) |
356 |
continue; |
357 |
d = 1./ccount[i]; |
358 |
scalecolor(inpRGB[i], d); |
359 |
inpflags |= 1L<<i; |
360 |
} |
361 |
free((void *)scanln); |
362 |
} |
363 |
|
364 |
|
365 |
getcolors() /* get xyY colors from standard input */ |
366 |
{ |
367 |
int gotwhite = 0; |
368 |
COLOR whiteclr; |
369 |
int n; |
370 |
float xyYin[3]; |
371 |
|
372 |
while (fgetval(stdin, 'i', &n) == 1) { /* read colors */ |
373 |
if (n < 0 | n > 24 || |
374 |
fgetval(stdin, 'f', &xyYin[0]) != 1 || |
375 |
fgetval(stdin, 'f', &xyYin[1]) != 1 || |
376 |
fgetval(stdin, 'f', &xyYin[2]) != 1 || |
377 |
xyYin[0] < 0. | xyYin[1] < 0. || |
378 |
xyYin[0] + xyYin[1] > 1.) { |
379 |
fprintf(stderr, "%s: bad color input data\n", |
380 |
progname); |
381 |
exit(1); |
382 |
} |
383 |
if (n == 0) { /* calibration white */ |
384 |
xyY2RGB(whiteclr, xyYin); |
385 |
gotwhite++; |
386 |
} else { /* standard color */ |
387 |
n--; |
388 |
xyY2RGB(inpRGB[n], xyYin); |
389 |
inpflags |= 1L<<n; |
390 |
} |
391 |
} |
392 |
/* normalize colors */ |
393 |
if (!gotwhite) { |
394 |
if (!(inpflags & 1L<<White)) { |
395 |
fprintf(stderr, "%s: missing input for White\n", |
396 |
progname); |
397 |
exit(1); |
398 |
} |
399 |
setcolor(whiteclr, |
400 |
colval(inpRGB[White],RED)/colval(mbRGB[White],RED), |
401 |
colval(inpRGB[White],GRN)/colval(mbRGB[White],GRN), |
402 |
colval(inpRGB[White],BLU)/colval(mbRGB[White],BLU)); |
403 |
} |
404 |
for (n = 0; n < 24; n++) |
405 |
if (inpflags & 1L<<n) |
406 |
setcolor(inpRGB[n], |
407 |
colval(inpRGB[n],RED)/colval(whiteclr,RED), |
408 |
colval(inpRGB[n],GRN)/colval(whiteclr,GRN), |
409 |
colval(inpRGB[n],BLU)/colval(whiteclr,BLU)); |
410 |
} |
411 |
|
412 |
|
413 |
bresp(y, x) /* piecewise linear interpolation of primaries */ |
414 |
COLOR y, x; |
415 |
{ |
416 |
register int i, n; |
417 |
|
418 |
for (i = 0; i < 3; i++) { |
419 |
for (n = 0; n < NMBNEU-2; n++) |
420 |
if (colval(x,i) < colval(bramp[n+1][0],i)) |
421 |
break; |
422 |
colval(y,i) = ((colval(bramp[n+1][0],i) - colval(x,i)) * |
423 |
colval(bramp[n][1],i) + |
424 |
(colval(x,i) - colval(bramp[n][0],i)) * |
425 |
colval(bramp[n+1][1],i)) / |
426 |
(colval(bramp[n+1][0],i) - colval(bramp[n][0],i)); |
427 |
} |
428 |
} |
429 |
|
430 |
|
431 |
compute() /* compute color mapping */ |
432 |
{ |
433 |
COLOR clrin[24], clrout[24]; |
434 |
long cflags; |
435 |
COLOR ctmp; |
436 |
register int i, n; |
437 |
/* did we get what we need? */ |
438 |
if ((inpflags & REQFLGS) != REQFLGS) { |
439 |
fprintf(stderr, "%s: missing required input colors\n", |
440 |
progname); |
441 |
exit(1); |
442 |
} |
443 |
/* compute piecewise luminance curve */ |
444 |
for (i = 0; i < NMBNEU; i++) { |
445 |
copycolor(bramp[i][0], inpRGB[mbneu[i]]); |
446 |
copycolor(bramp[i][1], mbRGB[mbneu[i]]); |
447 |
} |
448 |
/* compute color space gamut */ |
449 |
if (scanning) { |
450 |
copycolor(colmin, cblack); |
451 |
copycolor(colmax, cwhite); |
452 |
scalecolor(colmax, irrad); |
453 |
} else |
454 |
for (i = 0; i < 3; i++) { |
455 |
colval(colmin,i) = colval(bramp[0][0],i) - |
456 |
colval(bramp[0][1],i) * |
457 |
(colval(bramp[1][0],i)-colval(bramp[0][0],i)) / |
458 |
(colval(bramp[1][1],i)-colval(bramp[1][0],i)); |
459 |
colval(colmax,i) = colval(bramp[NMBNEU-2][0],i) + |
460 |
(1.-colval(bramp[NMBNEU-2][1],i)) * |
461 |
(colval(bramp[NMBNEU-1][0],i) - |
462 |
colval(bramp[NMBNEU-2][0],i)) / |
463 |
(colval(bramp[NMBNEU-1][1],i) - |
464 |
colval(bramp[NMBNEU-2][1],i)); |
465 |
} |
466 |
/* compute color mapping */ |
467 |
do { |
468 |
cflags = inpflags & ~gmtflags; |
469 |
n = 0; /* compute transform matrix */ |
470 |
for (i = 0; i < 24; i++) |
471 |
if (cflags & 1L<<i) { |
472 |
bresp(clrin[n], inpRGB[i]); |
473 |
copycolor(clrout[n], mbRGB[i]); |
474 |
n++; |
475 |
} |
476 |
compsoln(clrin, clrout, n); |
477 |
if (irrad > 0.99 && irrad < 1.01) /* check gamut */ |
478 |
for (i = 0; i < 24; i++) |
479 |
if (cflags & 1L<<i && cvtcolor(ctmp, mbRGB[i])) |
480 |
gmtflags |= 1L<<i; |
481 |
} while (cflags & gmtflags); |
482 |
if (gmtflags & MODFLGS) |
483 |
fprintf(stderr, |
484 |
"%s: warning - some moderate colors are out of gamut\n", |
485 |
progname); |
486 |
} |
487 |
|
488 |
|
489 |
putmapping() /* put out color mapping */ |
490 |
{ |
491 |
static char cchar[3] = {'r', 'g', 'b'}; |
492 |
register int i, j; |
493 |
/* print brightness mapping */ |
494 |
for (j = 0; j < 3; j++) { |
495 |
printf("%cxa(i) : select(i", cchar[j]); |
496 |
for (i = 0; i < NMBNEU; i++) |
497 |
printf(",%g", colval(bramp[i][0],j)); |
498 |
printf(");\n"); |
499 |
printf("%cya(i) : select(i", cchar[j]); |
500 |
for (i = 0; i < NMBNEU; i++) |
501 |
printf(",%g", colval(bramp[i][1],j)); |
502 |
printf(");\n"); |
503 |
printf("%cfi(n) = if(n-%g, %d, if(%cxa(n+1)-%c, n, %cfi(n+1)));\n", |
504 |
cchar[j], NMBNEU-1.5, NMBNEU-1, cchar[j], |
505 |
cchar[j], cchar[j]); |
506 |
printf("%cndx = %cfi(1);\n", cchar[j], cchar[j]); |
507 |
printf("%c%c = ((%cxa(%cndx+1)-%c)*%cya(%cndx) + ", |
508 |
cchar[j], scanning?'n':'o', cchar[j], |
509 |
cchar[j], cchar[j], cchar[j], cchar[j]); |
510 |
printf("(%c-%cxa(%cndx))*%cya(%cndx+1)) /\n", |
511 |
cchar[j], cchar[j], cchar[j], |
512 |
cchar[j], cchar[j]); |
513 |
printf("\t\t(%cxa(%cndx+1) - %cxa(%cndx)) ;\n", |
514 |
cchar[j], cchar[j], cchar[j], cchar[j]); |
515 |
} |
516 |
/* print color mapping */ |
517 |
if (scanning) { |
518 |
printf("r = ri(1); g = gi(1); b = bi(1);\n"); |
519 |
printf("ro = %g*rn + %g*gn + %g*bn ;\n", |
520 |
solmat[0][0], solmat[0][1], solmat[0][2]); |
521 |
printf("go = %g*rn + %g*gn + %g*bn ;\n", |
522 |
solmat[1][0], solmat[1][1], solmat[1][2]); |
523 |
printf("bo = %g*rn + %g*gn + %g*bn ;\n", |
524 |
solmat[2][0], solmat[2][1], solmat[2][2]); |
525 |
} else { |
526 |
printf("r1 = ri(1); g1 = gi(1); b1 = bi(1);\n"); |
527 |
printf("r = %g*r1 + %g*g1 + %g*b1 ;\n", |
528 |
solmat[0][0], solmat[0][1], solmat[0][2]); |
529 |
printf("g = %g*r1 + %g*g1 + %g*b1 ;\n", |
530 |
solmat[1][0], solmat[1][1], solmat[1][2]); |
531 |
printf("b = %g*r1 + %g*g1 + %g*b1 ;\n", |
532 |
solmat[2][0], solmat[2][1], solmat[2][2]); |
533 |
} |
534 |
} |
535 |
|
536 |
|
537 |
compsoln(cin, cout, n) /* solve 3xN system using least-squares */ |
538 |
COLOR cin[], cout[]; |
539 |
int n; |
540 |
{ |
541 |
extern double mx3d_adjoint(), fabs(); |
542 |
double mat[3][3], invmat[3][3]; |
543 |
double det; |
544 |
double colv[3], rowv[3]; |
545 |
register int i, j, k; |
546 |
|
547 |
if (n < 3) { |
548 |
fprintf(stderr, "%s: too few colors to match!\n", progname); |
549 |
exit(1); |
550 |
} |
551 |
if (n == 3) |
552 |
for (i = 0; i < 3; i++) |
553 |
for (j = 0; j < 3; j++) |
554 |
mat[i][j] = colval(cin[j],i); |
555 |
else { /* compute A^t A */ |
556 |
for (i = 0; i < 3; i++) |
557 |
for (j = i; j < 3; j++) { |
558 |
mat[i][j] = 0.; |
559 |
for (k = 0; k < n; k++) |
560 |
mat[i][j] += colval(cin[k],i) * |
561 |
colval(cin[k],j); |
562 |
} |
563 |
for (i = 1; i < 3; i++) /* using symmetry */ |
564 |
for (j = 0; j < i; j++) |
565 |
mat[i][j] = mat[j][i]; |
566 |
} |
567 |
det = mx3d_adjoint(mat, invmat); |
568 |
if (fabs(det) < 1e-4) { |
569 |
fprintf(stderr, "%s: cannot compute color mapping\n", |
570 |
progname); |
571 |
solmat[0][0] = solmat[1][1] = solmat[2][2] = 1.; |
572 |
solmat[0][1] = solmat[0][2] = solmat[1][0] = |
573 |
solmat[1][2] = solmat[2][0] = solmat[2][1] = 0.; |
574 |
return; |
575 |
} |
576 |
for (i = 0; i < 3; i++) |
577 |
for (j = 0; j < 3; j++) |
578 |
invmat[i][j] /= det; |
579 |
for (i = 0; i < 3; i++) { |
580 |
if (n == 3) |
581 |
for (j = 0; j < 3; j++) |
582 |
colv[j] = colval(cout[j],i); |
583 |
else |
584 |
for (j = 0; j < 3; j++) { |
585 |
colv[j] = 0.; |
586 |
for (k = 0; k < n; k++) |
587 |
colv[j] += colval(cout[k],i) * |
588 |
colval(cin[k],j); |
589 |
} |
590 |
mx3d_transform(colv, invmat, rowv); |
591 |
for (j = 0; j < 3; j++) |
592 |
solmat[i][j] = rowv[j]; |
593 |
} |
594 |
} |
595 |
|
596 |
|
597 |
cwarp() /* compute color warp map */ |
598 |
{ |
599 |
register int i; |
600 |
|
601 |
if ((wcor = new3dw(W3EXACT)) == NULL) |
602 |
goto memerr; |
603 |
for (i = 0; i < 24; i++) |
604 |
if (!add3dpt(wcor, inpRGB[i], mbRGB[i])) |
605 |
goto memerr; |
606 |
return; |
607 |
memerr: |
608 |
perror(progname); |
609 |
exit(1); |
610 |
} |
611 |
|
612 |
|
613 |
int |
614 |
cvtcolor(cout, cin) /* convert color according to our mapping */ |
615 |
COLOR cout, cin; |
616 |
{ |
617 |
COLOR ctmp; |
618 |
int clipped; |
619 |
|
620 |
if (wcor != NULL) { |
621 |
clipped = warp3d(cout, cin, wcor); |
622 |
clipped |= clipgamut(cout,bright(cout),CGAMUT,colmin,colmax); |
623 |
} else if (scanning) { |
624 |
bresp(ctmp, cin); |
625 |
clipped = cresp(cout, ctmp); |
626 |
} else { |
627 |
clipped = cresp(ctmp, cin); |
628 |
bresp(cout, ctmp); |
629 |
} |
630 |
return(clipped); |
631 |
} |
632 |
|
633 |
|
634 |
int |
635 |
cresp(cout, cin) /* transform color according to matrix */ |
636 |
COLOR cout, cin; |
637 |
{ |
638 |
colortrans(cout, solmat, cin); |
639 |
return(clipgamut(cout, bright(cout), CGAMUT, colmin, colmax)); |
640 |
} |
641 |
|
642 |
|
643 |
xyY2RGB(rgbout, xyYin) /* convert xyY to RGB */ |
644 |
COLOR rgbout; |
645 |
register float xyYin[3]; |
646 |
{ |
647 |
COLOR ctmp; |
648 |
double d; |
649 |
|
650 |
d = xyYin[2] / xyYin[1]; |
651 |
ctmp[0] = xyYin[0] * d; |
652 |
ctmp[1] = xyYin[2]; |
653 |
ctmp[2] = (1. - xyYin[0] - xyYin[1]) * d; |
654 |
/* allow negative values */ |
655 |
colortrans(rgbout, xyz2rgbmat, ctmp); |
656 |
} |
657 |
|
658 |
|
659 |
picdebug() /* put out debugging picture */ |
660 |
{ |
661 |
static COLOR blkcol = BLKCOLOR; |
662 |
COLOR *scan; |
663 |
int y, i; |
664 |
register int x, rg; |
665 |
|
666 |
if (fseek(stdin, 0L, 0) == EOF) { |
667 |
fprintf(stderr, "%s: cannot seek on input picture\n", progname); |
668 |
exit(1); |
669 |
} |
670 |
getheader(stdin, NULL, NULL); /* skip input header */ |
671 |
fgetresolu(&xmax, &ymax, stdin); |
672 |
/* allocate scanline */ |
673 |
scan = (COLOR *)malloc(xmax*sizeof(COLOR)); |
674 |
if (scan == NULL) { |
675 |
perror(progname); |
676 |
exit(1); |
677 |
} |
678 |
/* finish debug header */ |
679 |
fputformat(COLRFMT, debugfp); |
680 |
putc('\n', debugfp); |
681 |
fprtresolu(xmax, ymax, debugfp); |
682 |
/* write debug picture */ |
683 |
for (y = ymax-1; y >= 0; y--) { |
684 |
if (freadscan(scan, xmax, stdin) < 0) { |
685 |
fprintf(stderr, "%s: error rereading input picture\n", |
686 |
progname); |
687 |
exit(1); |
688 |
} |
689 |
for (x = 0; x < xmax; x++) { |
690 |
rg = chartndx(x, y, &i); |
691 |
if (rg == RG_CENT) { |
692 |
if (!(1L<<i & gmtflags) || (x+y)&07) { |
693 |
copycolor(scan[x], mbRGB[i]); |
694 |
clipgamut(scan[x], bright(scan[x]), |
695 |
CGAMUT, colmin, colmax); |
696 |
} else |
697 |
copycolor(scan[x], blkcol); |
698 |
} else if (rg == RG_CORR) |
699 |
cvtcolor(scan[x], scan[x]); |
700 |
else if (rg != RG_ORIG) |
701 |
copycolor(scan[x], blkcol); |
702 |
} |
703 |
if (fwritescan(scan, xmax, debugfp) < 0) { |
704 |
fprintf(stderr, "%s: error writing debugging picture\n", |
705 |
progname); |
706 |
exit(1); |
707 |
} |
708 |
} |
709 |
/* clean up */ |
710 |
fclose(debugfp); |
711 |
free((void *)scan); |
712 |
} |
713 |
|
714 |
|
715 |
clrdebug() /* put out debug picture from color input */ |
716 |
{ |
717 |
static COLR blkclr = BLKCOLR; |
718 |
COLR mbclr[24], cvclr[24], orclr[24]; |
719 |
COLR *scan; |
720 |
COLOR ctmp, ct2; |
721 |
int y, i; |
722 |
register int x, rg; |
723 |
/* convert colors */ |
724 |
for (i = 0; i < 24; i++) { |
725 |
copycolor(ctmp, mbRGB[i]); |
726 |
clipgamut(ctmp, bright(ctmp), CGAMUT, cblack, cwhite); |
727 |
setcolr(mbclr[i], colval(ctmp,RED), |
728 |
colval(ctmp,GRN), colval(ctmp,BLU)); |
729 |
if (inpflags & 1L<<i) { |
730 |
copycolor(ctmp, inpRGB[i]); |
731 |
clipgamut(ctmp, bright(ctmp), CGAMUT, cblack, cwhite); |
732 |
setcolr(orclr[i], colval(ctmp,RED), |
733 |
colval(ctmp,GRN), colval(ctmp,BLU)); |
734 |
if (rawmap) |
735 |
copycolr(cvclr[i], mbclr[i]); |
736 |
else { |
737 |
bresp(ctmp, inpRGB[i]); |
738 |
colortrans(ct2, solmat, ctmp); |
739 |
clipgamut(ct2, bright(ct2), CGAMUT, |
740 |
cblack, cwhite); |
741 |
setcolr(cvclr[i], colval(ct2,RED), |
742 |
colval(ct2,GRN), |
743 |
colval(ct2,BLU)); |
744 |
} |
745 |
} |
746 |
} |
747 |
/* allocate scanline */ |
748 |
scan = (COLR *)malloc(xmax*sizeof(COLR)); |
749 |
if (scan == NULL) { |
750 |
perror(progname); |
751 |
exit(1); |
752 |
} |
753 |
/* finish debug header */ |
754 |
fputformat(COLRFMT, debugfp); |
755 |
putc('\n', debugfp); |
756 |
fprtresolu(xmax, ymax, debugfp); |
757 |
/* write debug picture */ |
758 |
for (y = ymax-1; y >= 0; y--) { |
759 |
for (x = 0; x < xmax; x++) { |
760 |
rg = chartndx(x, y, &i); |
761 |
if (rg == RG_CENT) { |
762 |
if (!(1L<<i & gmtflags) || (x+y)&07) |
763 |
copycolr(scan[x], mbclr[i]); |
764 |
else |
765 |
copycolr(scan[x], blkclr); |
766 |
} else if (rg == RG_BORD || !(1L<<i & inpflags)) |
767 |
copycolr(scan[x], blkclr); |
768 |
else if (rg == RG_ORIG) |
769 |
copycolr(scan[x], orclr[i]); |
770 |
else /* rg == RG_CORR */ |
771 |
copycolr(scan[x], cvclr[i]); |
772 |
} |
773 |
if (fwritecolrs(scan, xmax, debugfp) < 0) { |
774 |
fprintf(stderr, "%s: error writing debugging picture\n", |
775 |
progname); |
776 |
exit(1); |
777 |
} |
778 |
} |
779 |
/* clean up */ |
780 |
fclose(debugfp); |
781 |
free((void *)scan); |
782 |
} |
783 |
|
784 |
|
785 |
getpos(name, bnds, fp) /* get boundary position */ |
786 |
char *name; |
787 |
int bnds[2]; |
788 |
FILE *fp; |
789 |
{ |
790 |
char buf[64]; |
791 |
|
792 |
fprintf(stderr, "\tSelect corner: %s\n", name); |
793 |
if (fgets(buf, sizeof(buf), fp) == NULL || |
794 |
sscanf(buf, "%d %d", &bnds[0], &bnds[1]) != 2) { |
795 |
fprintf(stderr, "%s: read error from display process\n", |
796 |
progname); |
797 |
exit(1); |
798 |
} |
799 |
} |
800 |
|
801 |
|
802 |
pickchartpos(pfn) /* display picture and pick chart location */ |
803 |
char *pfn; |
804 |
{ |
805 |
char combuf[512]; |
806 |
FILE *pfp; |
807 |
|
808 |
sprintf(combuf, DISPCOM, pfn); |
809 |
if ((pfp = popen(combuf, "r")) == NULL) { |
810 |
perror(combuf); |
811 |
exit(1); |
812 |
} |
813 |
fputs("Use middle mouse button to select chart corners:\n", stderr); |
814 |
getpos("upper left (dark skin)", bounds[0], pfp); |
815 |
getpos("upper right (bluish green)", bounds[1], pfp); |
816 |
getpos("lower left (white)", bounds[2], pfp); |
817 |
getpos("lower right (black)", bounds[3], pfp); |
818 |
fputs("Got it -- quit display program.\n", stderr); |
819 |
pclose(pfp); |
820 |
} |