1 |
#ifndef lint |
2 |
static const char RCSid[] = "$Id: macbethcal.c,v 2.21 2003/10/27 10:24:51 schorsch 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 "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 |
SET_FILE_BINARY(debugfp); |
145 |
newheader("RADIANCE", debugfp); /* start */ |
146 |
printargs(argc, argv, debugfp); /* header */ |
147 |
break; |
148 |
case 'p': /* picture position */ |
149 |
if (badarg(argc-i-1, argv+i+1, "iiiiiiii")) |
150 |
goto userr; |
151 |
bounds[0][0] = atoi(argv[++i]); |
152 |
bounds[0][1] = atoi(argv[++i]); |
153 |
bounds[1][0] = atoi(argv[++i]); |
154 |
bounds[1][1] = atoi(argv[++i]); |
155 |
bounds[2][0] = atoi(argv[++i]); |
156 |
bounds[2][1] = atoi(argv[++i]); |
157 |
bounds[3][0] = atoi(argv[++i]); |
158 |
bounds[3][1] = atoi(argv[++i]); |
159 |
scanning = 2; |
160 |
break; |
161 |
case 'P': /* pick position */ |
162 |
scanning = 3; |
163 |
break; |
164 |
case 'i': /* irradiance factor */ |
165 |
i++; |
166 |
if (badarg(argc-i, argv+i, "f")) |
167 |
goto userr; |
168 |
irrad = atof(argv[i]); |
169 |
break; |
170 |
case 'm': /* raw map output */ |
171 |
rawmap = 1; |
172 |
break; |
173 |
case 'c': /* color input */ |
174 |
scanning = 0; |
175 |
break; |
176 |
default: |
177 |
goto userr; |
178 |
} |
179 |
/* open files */ |
180 |
if (i < argc && freopen(argv[i], "r", stdin) == NULL) { |
181 |
perror(argv[i]); |
182 |
exit(1); |
183 |
} |
184 |
if (i+1 < argc && freopen(argv[i+1], "w", stdout) == NULL) { |
185 |
perror(argv[i+1]); |
186 |
exit(1); |
187 |
} |
188 |
if (scanning) { /* load input picture header */ |
189 |
SET_FILE_BINARY(stdin); |
190 |
if (checkheader(stdin, COLRFMT, NULL) < 0 || |
191 |
fgetresolu(&xmax, &ymax, stdin) < 0) { |
192 |
fprintf(stderr, "%s: bad input picture\n", progname); |
193 |
exit(1); |
194 |
} |
195 |
if (scanning == 3) { |
196 |
if (i >= argc) |
197 |
goto userr; |
198 |
pickchartpos(argv[i]); |
199 |
scanning = 2; |
200 |
} |
201 |
} else { /* else set default xmax and ymax */ |
202 |
xmax = 512; |
203 |
ymax = 2*512/3; |
204 |
} |
205 |
if (scanning != 2) { /* use default boundaries */ |
206 |
bounds[0][0] = bounds[2][0] = .029*xmax + .5; |
207 |
bounds[0][1] = bounds[1][1] = .956*ymax + .5; |
208 |
bounds[1][0] = bounds[3][0] = .971*xmax + .5; |
209 |
bounds[2][1] = bounds[3][1] = .056*ymax + .5; |
210 |
} |
211 |
init(); /* initialize */ |
212 |
if (scanning) /* get picture colors */ |
213 |
getpicture(); |
214 |
else |
215 |
getcolors(); |
216 |
compute(); /* compute color mapping */ |
217 |
if (rawmap) { /* print out raw correspondence */ |
218 |
register int j; |
219 |
|
220 |
printf("# Color correspondence produced by:\n#\t\t"); |
221 |
printargs(argc, argv, stdout); |
222 |
printf("#\tUsage: pcwarp %s uncorrected.pic > corrected.pic\n", |
223 |
i+1 < argc ? argv[i+1] : "{this_file}"); |
224 |
printf("#\t Or: pcond [options] -m %s orig.pic > output.pic\n", |
225 |
i+1 < argc ? argv[i+1] : "{this_file}"); |
226 |
for (j = 0; j < 24; j++) |
227 |
printf("%f %f %f %f %f %f\n", |
228 |
colval(inpRGB[j],RED), colval(inpRGB[j],GRN), |
229 |
colval(inpRGB[j],BLU), colval(mbRGB[j],RED), |
230 |
colval(mbRGB[j],GRN), colval(mbRGB[j],BLU)); |
231 |
if (scanning && debugfp != NULL) |
232 |
cwarp(); /* color warp for debugging */ |
233 |
} else { /* print color mapping */ |
234 |
/* print header */ |
235 |
printf("{\n\tColor correction file computed by:\n\t\t"); |
236 |
printargs(argc, argv, stdout); |
237 |
printf("\n\tUsage: pcomb -f %s uncorrected.pic > corrected.pic\n", |
238 |
i+1 < argc ? argv[i+1] : "{this_file}"); |
239 |
if (!scanning) |
240 |
printf("\t Or: pcond [options] -f %s orig.pic > output.pic\n", |
241 |
i+1 < argc ? argv[i+1] : "{this_file}"); |
242 |
printf("}\n"); |
243 |
putmapping(); /* put out color mapping */ |
244 |
} |
245 |
if (debugfp != NULL) { /* put out debug picture */ |
246 |
if (scanning) |
247 |
picdebug(); |
248 |
else |
249 |
clrdebug(); |
250 |
} |
251 |
exit(0); |
252 |
userr: |
253 |
fprintf(stderr, |
254 |
"Usage: %s [-d dbg.pic][-P | -p xul yul xur yur xll yll xlr ylr][-i irrad][-m] input.pic [output.{cal|cwp}]\n", |
255 |
progname); |
256 |
fprintf(stderr, " or: %s [-d dbg.pic][-i irrad][-m] -c [xyY.dat [output.{cal|cwp}]]\n", |
257 |
progname); |
258 |
exit(1); |
259 |
} |
260 |
|
261 |
|
262 |
init() /* initialize */ |
263 |
{ |
264 |
double quad[4][2]; |
265 |
register int i; |
266 |
/* make coordinate transformation */ |
267 |
quad[0][0] = bounds[0][0]; |
268 |
quad[0][1] = bounds[0][1]; |
269 |
quad[1][0] = bounds[1][0]; |
270 |
quad[1][1] = bounds[1][1]; |
271 |
quad[2][0] = bounds[3][0]; |
272 |
quad[2][1] = bounds[3][1]; |
273 |
quad[3][0] = bounds[2][0]; |
274 |
quad[3][1] = bounds[2][1]; |
275 |
|
276 |
if (pmap_quad_rect(0., 0., 6., 4., quad, imgxfm) == PMAP_BAD) { |
277 |
fprintf(stderr, "%s: bad chart boundaries\n", progname); |
278 |
exit(1); |
279 |
} |
280 |
/* map MacBeth colors to RGB space */ |
281 |
for (i = 0; i < 24; i++) { |
282 |
xyY2RGB(mbRGB[i], mbxyY[i]); |
283 |
scalecolor(mbRGB[i], irrad); |
284 |
} |
285 |
} |
286 |
|
287 |
|
288 |
int |
289 |
chartndx(x, y, np) /* find color number for position */ |
290 |
int x, y; |
291 |
int *np; |
292 |
{ |
293 |
double ipos[3], cpos[3]; |
294 |
int ix, iy; |
295 |
double fx, fy; |
296 |
|
297 |
ipos[0] = x; |
298 |
ipos[1] = y; |
299 |
ipos[2] = 1; |
300 |
mx3d_transform(ipos, imgxfm, cpos); |
301 |
cpos[0] /= cpos[2]; |
302 |
cpos[1] /= cpos[2]; |
303 |
if (cpos[0] < 0. || cpos[0] >= 6. || cpos[1] < 0. || cpos[1] >= 4.) |
304 |
return(RG_BORD); |
305 |
ix = cpos[0]; |
306 |
iy = cpos[1]; |
307 |
fx = cpos[0] - ix; |
308 |
fy = cpos[1] - iy; |
309 |
*np = iy*6 + ix; |
310 |
if (fx >= 0.35 && fx < 0.65 && fy >= 0.35 && fy < 0.65) |
311 |
return(RG_CENT); |
312 |
if (fx < 0.05 || fx >= 0.95 || fy < 0.05 || fy >= 0.95) |
313 |
return(RG_BORD); |
314 |
if (fx >= 0.5) /* right side is corrected */ |
315 |
return(RG_CORR); |
316 |
return(RG_ORIG); /* left side is original */ |
317 |
} |
318 |
|
319 |
|
320 |
getpicture() /* load in picture colors */ |
321 |
{ |
322 |
COLR *scanln; |
323 |
COLOR pval; |
324 |
int ccount[24]; |
325 |
double d; |
326 |
int y, i; |
327 |
register int x; |
328 |
|
329 |
scanln = (COLR *)malloc(xmax*sizeof(COLR)); |
330 |
if (scanln == NULL) { |
331 |
perror(progname); |
332 |
exit(1); |
333 |
} |
334 |
for (i = 0; i < 24; i++) { |
335 |
setcolor(inpRGB[i], 0., 0., 0.); |
336 |
ccount[i] = 0; |
337 |
} |
338 |
for (y = ymax-1; y >= 0; y--) { |
339 |
if (freadcolrs(scanln, xmax, stdin) < 0) { |
340 |
fprintf(stderr, "%s: error reading input picture\n", |
341 |
progname); |
342 |
exit(1); |
343 |
} |
344 |
for (x = 0; x < xmax; x++) |
345 |
if (chartndx(x, y, &i) == RG_CENT) { |
346 |
colr_color(pval, scanln[x]); |
347 |
addcolor(inpRGB[i], pval); |
348 |
ccount[i]++; |
349 |
} |
350 |
} |
351 |
for (i = 0; i < 24; i++) { /* compute averages */ |
352 |
if (ccount[i] == 0) |
353 |
continue; |
354 |
d = 1./ccount[i]; |
355 |
scalecolor(inpRGB[i], d); |
356 |
inpflags |= 1L<<i; |
357 |
} |
358 |
free((void *)scanln); |
359 |
} |
360 |
|
361 |
|
362 |
getcolors() /* get xyY colors from standard input */ |
363 |
{ |
364 |
int gotwhite = 0; |
365 |
COLOR whiteclr; |
366 |
int n; |
367 |
float xyYin[3]; |
368 |
|
369 |
while (fgetval(stdin, 'i', &n) == 1) { /* read colors */ |
370 |
if ((n < 0) | (n > 24) || |
371 |
fgetval(stdin, 'f', &xyYin[0]) != 1 || |
372 |
fgetval(stdin, 'f', &xyYin[1]) != 1 || |
373 |
fgetval(stdin, 'f', &xyYin[2]) != 1 || |
374 |
(xyYin[0] < 0.) | (xyYin[1] < 0.) || |
375 |
xyYin[0] + xyYin[1] > 1.) { |
376 |
fprintf(stderr, "%s: bad color input data\n", |
377 |
progname); |
378 |
exit(1); |
379 |
} |
380 |
if (n == 0) { /* calibration white */ |
381 |
xyY2RGB(whiteclr, xyYin); |
382 |
gotwhite++; |
383 |
} else { /* standard color */ |
384 |
n--; |
385 |
xyY2RGB(inpRGB[n], xyYin); |
386 |
inpflags |= 1L<<n; |
387 |
} |
388 |
} |
389 |
/* normalize colors */ |
390 |
if (!gotwhite) { |
391 |
if (!(inpflags & 1L<<White)) { |
392 |
fprintf(stderr, "%s: missing input for White\n", |
393 |
progname); |
394 |
exit(1); |
395 |
} |
396 |
setcolor(whiteclr, |
397 |
colval(inpRGB[White],RED)/colval(mbRGB[White],RED), |
398 |
colval(inpRGB[White],GRN)/colval(mbRGB[White],GRN), |
399 |
colval(inpRGB[White],BLU)/colval(mbRGB[White],BLU)); |
400 |
} |
401 |
for (n = 0; n < 24; n++) |
402 |
if (inpflags & 1L<<n) |
403 |
setcolor(inpRGB[n], |
404 |
colval(inpRGB[n],RED)/colval(whiteclr,RED), |
405 |
colval(inpRGB[n],GRN)/colval(whiteclr,GRN), |
406 |
colval(inpRGB[n],BLU)/colval(whiteclr,BLU)); |
407 |
} |
408 |
|
409 |
|
410 |
bresp(y, x) /* piecewise linear interpolation of primaries */ |
411 |
COLOR y, x; |
412 |
{ |
413 |
register int i, n; |
414 |
|
415 |
for (i = 0; i < 3; i++) { |
416 |
for (n = 0; n < NMBNEU-2; n++) |
417 |
if (colval(x,i) < colval(bramp[n+1][0],i)) |
418 |
break; |
419 |
colval(y,i) = ((colval(bramp[n+1][0],i) - colval(x,i)) * |
420 |
colval(bramp[n][1],i) + |
421 |
(colval(x,i) - colval(bramp[n][0],i)) * |
422 |
colval(bramp[n+1][1],i)) / |
423 |
(colval(bramp[n+1][0],i) - colval(bramp[n][0],i)); |
424 |
} |
425 |
} |
426 |
|
427 |
|
428 |
compute() /* compute color mapping */ |
429 |
{ |
430 |
COLOR clrin[24], clrout[24]; |
431 |
long cflags; |
432 |
COLOR ctmp; |
433 |
register int i, n; |
434 |
/* did we get what we need? */ |
435 |
if ((inpflags & REQFLGS) != REQFLGS) { |
436 |
fprintf(stderr, "%s: missing required input colors\n", |
437 |
progname); |
438 |
exit(1); |
439 |
} |
440 |
/* compute piecewise luminance curve */ |
441 |
for (i = 0; i < NMBNEU; i++) { |
442 |
copycolor(bramp[i][0], inpRGB[mbneu[i]]); |
443 |
copycolor(bramp[i][1], mbRGB[mbneu[i]]); |
444 |
} |
445 |
/* compute color space gamut */ |
446 |
if (scanning) { |
447 |
copycolor(colmin, cblack); |
448 |
copycolor(colmax, cwhite); |
449 |
scalecolor(colmax, irrad); |
450 |
} else |
451 |
for (i = 0; i < 3; i++) { |
452 |
colval(colmin,i) = colval(bramp[0][0],i) - |
453 |
colval(bramp[0][1],i) * |
454 |
(colval(bramp[1][0],i)-colval(bramp[0][0],i)) / |
455 |
(colval(bramp[1][1],i)-colval(bramp[1][0],i)); |
456 |
colval(colmax,i) = colval(bramp[NMBNEU-2][0],i) + |
457 |
(1.-colval(bramp[NMBNEU-2][1],i)) * |
458 |
(colval(bramp[NMBNEU-1][0],i) - |
459 |
colval(bramp[NMBNEU-2][0],i)) / |
460 |
(colval(bramp[NMBNEU-1][1],i) - |
461 |
colval(bramp[NMBNEU-2][1],i)); |
462 |
} |
463 |
/* compute color mapping */ |
464 |
do { |
465 |
cflags = inpflags & ~gmtflags; |
466 |
n = 0; /* compute transform matrix */ |
467 |
for (i = 0; i < 24; i++) |
468 |
if (cflags & 1L<<i) { |
469 |
bresp(clrin[n], inpRGB[i]); |
470 |
copycolor(clrout[n], mbRGB[i]); |
471 |
n++; |
472 |
} |
473 |
compsoln(clrin, clrout, n); |
474 |
if (irrad > 0.99 && irrad < 1.01) /* check gamut */ |
475 |
for (i = 0; i < 24; i++) |
476 |
if (cflags & 1L<<i && cvtcolor(ctmp, mbRGB[i])) |
477 |
gmtflags |= 1L<<i; |
478 |
} while (cflags & gmtflags); |
479 |
if (gmtflags & MODFLGS) |
480 |
fprintf(stderr, |
481 |
"%s: warning - some moderate colors are out of gamut\n", |
482 |
progname); |
483 |
} |
484 |
|
485 |
|
486 |
putmapping() /* put out color mapping */ |
487 |
{ |
488 |
static char cchar[3] = {'r', 'g', 'b'}; |
489 |
register int i, j; |
490 |
/* print brightness mapping */ |
491 |
for (j = 0; j < 3; j++) { |
492 |
printf("%cxa(i) : select(i", cchar[j]); |
493 |
for (i = 0; i < NMBNEU; i++) |
494 |
printf(",%g", colval(bramp[i][0],j)); |
495 |
printf(");\n"); |
496 |
printf("%cya(i) : select(i", cchar[j]); |
497 |
for (i = 0; i < NMBNEU; i++) |
498 |
printf(",%g", colval(bramp[i][1],j)); |
499 |
printf(");\n"); |
500 |
printf("%cfi(n) = if(n-%g, %d, if(%cxa(n+1)-%c, n, %cfi(n+1)));\n", |
501 |
cchar[j], NMBNEU-1.5, NMBNEU-1, cchar[j], |
502 |
cchar[j], cchar[j]); |
503 |
printf("%cndx = %cfi(1);\n", cchar[j], cchar[j]); |
504 |
printf("%c%c = ((%cxa(%cndx+1)-%c)*%cya(%cndx) + ", |
505 |
cchar[j], scanning?'n':'o', cchar[j], |
506 |
cchar[j], cchar[j], cchar[j], cchar[j]); |
507 |
printf("(%c-%cxa(%cndx))*%cya(%cndx+1)) /\n", |
508 |
cchar[j], cchar[j], cchar[j], |
509 |
cchar[j], cchar[j]); |
510 |
printf("\t\t(%cxa(%cndx+1) - %cxa(%cndx)) ;\n", |
511 |
cchar[j], cchar[j], cchar[j], cchar[j]); |
512 |
} |
513 |
/* print color mapping */ |
514 |
if (scanning) { |
515 |
printf("r = ri(1); g = gi(1); b = bi(1);\n"); |
516 |
printf("ro = %g*rn + %g*gn + %g*bn ;\n", |
517 |
solmat[0][0], solmat[0][1], solmat[0][2]); |
518 |
printf("go = %g*rn + %g*gn + %g*bn ;\n", |
519 |
solmat[1][0], solmat[1][1], solmat[1][2]); |
520 |
printf("bo = %g*rn + %g*gn + %g*bn ;\n", |
521 |
solmat[2][0], solmat[2][1], solmat[2][2]); |
522 |
} else { |
523 |
printf("r1 = ri(1); g1 = gi(1); b1 = bi(1);\n"); |
524 |
printf("r = %g*r1 + %g*g1 + %g*b1 ;\n", |
525 |
solmat[0][0], solmat[0][1], solmat[0][2]); |
526 |
printf("g = %g*r1 + %g*g1 + %g*b1 ;\n", |
527 |
solmat[1][0], solmat[1][1], solmat[1][2]); |
528 |
printf("b = %g*r1 + %g*g1 + %g*b1 ;\n", |
529 |
solmat[2][0], solmat[2][1], solmat[2][2]); |
530 |
} |
531 |
} |
532 |
|
533 |
|
534 |
compsoln(cin, cout, n) /* solve 3xN system using least-squares */ |
535 |
COLOR cin[], cout[]; |
536 |
int n; |
537 |
{ |
538 |
extern double mx3d_adjoint(), fabs(); |
539 |
double mat[3][3], invmat[3][3]; |
540 |
double det; |
541 |
double colv[3], rowv[3]; |
542 |
register int i, j, k; |
543 |
|
544 |
if (n < 3) { |
545 |
fprintf(stderr, "%s: too few colors to match!\n", progname); |
546 |
exit(1); |
547 |
} |
548 |
if (n == 3) |
549 |
for (i = 0; i < 3; i++) |
550 |
for (j = 0; j < 3; j++) |
551 |
mat[i][j] = colval(cin[j],i); |
552 |
else { /* compute A^t A */ |
553 |
for (i = 0; i < 3; i++) |
554 |
for (j = i; j < 3; j++) { |
555 |
mat[i][j] = 0.; |
556 |
for (k = 0; k < n; k++) |
557 |
mat[i][j] += colval(cin[k],i) * |
558 |
colval(cin[k],j); |
559 |
} |
560 |
for (i = 1; i < 3; i++) /* using symmetry */ |
561 |
for (j = 0; j < i; j++) |
562 |
mat[i][j] = mat[j][i]; |
563 |
} |
564 |
det = mx3d_adjoint(mat, invmat); |
565 |
if (fabs(det) < 1e-4) { |
566 |
fprintf(stderr, "%s: cannot compute color mapping\n", |
567 |
progname); |
568 |
solmat[0][0] = solmat[1][1] = solmat[2][2] = 1.; |
569 |
solmat[0][1] = solmat[0][2] = solmat[1][0] = |
570 |
solmat[1][2] = solmat[2][0] = solmat[2][1] = 0.; |
571 |
return; |
572 |
} |
573 |
for (i = 0; i < 3; i++) |
574 |
for (j = 0; j < 3; j++) |
575 |
invmat[i][j] /= det; |
576 |
for (i = 0; i < 3; i++) { |
577 |
if (n == 3) |
578 |
for (j = 0; j < 3; j++) |
579 |
colv[j] = colval(cout[j],i); |
580 |
else |
581 |
for (j = 0; j < 3; j++) { |
582 |
colv[j] = 0.; |
583 |
for (k = 0; k < n; k++) |
584 |
colv[j] += colval(cout[k],i) * |
585 |
colval(cin[k],j); |
586 |
} |
587 |
mx3d_transform(colv, invmat, rowv); |
588 |
for (j = 0; j < 3; j++) |
589 |
solmat[i][j] = rowv[j]; |
590 |
} |
591 |
} |
592 |
|
593 |
|
594 |
cwarp() /* compute color warp map */ |
595 |
{ |
596 |
register int i; |
597 |
|
598 |
if ((wcor = new3dw(W3EXACT)) == NULL) |
599 |
goto memerr; |
600 |
for (i = 0; i < 24; i++) |
601 |
if (!add3dpt(wcor, inpRGB[i], mbRGB[i])) |
602 |
goto memerr; |
603 |
return; |
604 |
memerr: |
605 |
perror(progname); |
606 |
exit(1); |
607 |
} |
608 |
|
609 |
|
610 |
int |
611 |
cvtcolor(cout, cin) /* convert color according to our mapping */ |
612 |
COLOR cout, cin; |
613 |
{ |
614 |
COLOR ctmp; |
615 |
int clipped; |
616 |
|
617 |
if (wcor != NULL) { |
618 |
clipped = warp3d(cout, cin, wcor); |
619 |
clipped |= clipgamut(cout,bright(cout),CGAMUT,colmin,colmax); |
620 |
} else if (scanning) { |
621 |
bresp(ctmp, cin); |
622 |
clipped = cresp(cout, ctmp); |
623 |
} else { |
624 |
clipped = cresp(ctmp, cin); |
625 |
bresp(cout, ctmp); |
626 |
} |
627 |
return(clipped); |
628 |
} |
629 |
|
630 |
|
631 |
int |
632 |
cresp(cout, cin) /* transform color according to matrix */ |
633 |
COLOR cout, cin; |
634 |
{ |
635 |
colortrans(cout, solmat, cin); |
636 |
return(clipgamut(cout, bright(cout), CGAMUT, colmin, colmax)); |
637 |
} |
638 |
|
639 |
|
640 |
xyY2RGB(rgbout, xyYin) /* convert xyY to RGB */ |
641 |
COLOR rgbout; |
642 |
register float xyYin[3]; |
643 |
{ |
644 |
COLOR ctmp; |
645 |
double d; |
646 |
|
647 |
d = xyYin[2] / xyYin[1]; |
648 |
ctmp[0] = xyYin[0] * d; |
649 |
ctmp[1] = xyYin[2]; |
650 |
ctmp[2] = (1. - xyYin[0] - xyYin[1]) * d; |
651 |
/* allow negative values */ |
652 |
colortrans(rgbout, xyz2rgbmat, ctmp); |
653 |
} |
654 |
|
655 |
|
656 |
picdebug() /* put out debugging picture */ |
657 |
{ |
658 |
static COLOR blkcol = BLKCOLOR; |
659 |
COLOR *scan; |
660 |
int y, i; |
661 |
register int x, rg; |
662 |
|
663 |
if (fseek(stdin, 0L, 0) == EOF) { |
664 |
fprintf(stderr, "%s: cannot seek on input picture\n", progname); |
665 |
exit(1); |
666 |
} |
667 |
getheader(stdin, NULL, NULL); /* skip input header */ |
668 |
fgetresolu(&xmax, &ymax, stdin); |
669 |
/* allocate scanline */ |
670 |
scan = (COLOR *)malloc(xmax*sizeof(COLOR)); |
671 |
if (scan == NULL) { |
672 |
perror(progname); |
673 |
exit(1); |
674 |
} |
675 |
/* finish debug header */ |
676 |
fputformat(COLRFMT, debugfp); |
677 |
putc('\n', debugfp); |
678 |
fprtresolu(xmax, ymax, debugfp); |
679 |
/* write debug picture */ |
680 |
for (y = ymax-1; y >= 0; y--) { |
681 |
if (freadscan(scan, xmax, stdin) < 0) { |
682 |
fprintf(stderr, "%s: error rereading input picture\n", |
683 |
progname); |
684 |
exit(1); |
685 |
} |
686 |
for (x = 0; x < xmax; x++) { |
687 |
rg = chartndx(x, y, &i); |
688 |
if (rg == RG_CENT) { |
689 |
if (!(1L<<i & gmtflags) || (x+y)&07) { |
690 |
copycolor(scan[x], mbRGB[i]); |
691 |
clipgamut(scan[x], bright(scan[x]), |
692 |
CGAMUT, colmin, colmax); |
693 |
} else |
694 |
copycolor(scan[x], blkcol); |
695 |
} else if (rg == RG_CORR) |
696 |
cvtcolor(scan[x], scan[x]); |
697 |
else if (rg != RG_ORIG) |
698 |
copycolor(scan[x], blkcol); |
699 |
} |
700 |
if (fwritescan(scan, xmax, debugfp) < 0) { |
701 |
fprintf(stderr, "%s: error writing debugging picture\n", |
702 |
progname); |
703 |
exit(1); |
704 |
} |
705 |
} |
706 |
/* clean up */ |
707 |
fclose(debugfp); |
708 |
free((void *)scan); |
709 |
} |
710 |
|
711 |
|
712 |
clrdebug() /* put out debug picture from color input */ |
713 |
{ |
714 |
static COLR blkclr = BLKCOLR; |
715 |
COLR mbclr[24], cvclr[24], orclr[24]; |
716 |
COLR *scan; |
717 |
COLOR ctmp, ct2; |
718 |
int y, i; |
719 |
register int x, rg; |
720 |
/* convert colors */ |
721 |
for (i = 0; i < 24; i++) { |
722 |
copycolor(ctmp, mbRGB[i]); |
723 |
clipgamut(ctmp, bright(ctmp), CGAMUT, cblack, cwhite); |
724 |
setcolr(mbclr[i], colval(ctmp,RED), |
725 |
colval(ctmp,GRN), colval(ctmp,BLU)); |
726 |
if (inpflags & 1L<<i) { |
727 |
copycolor(ctmp, inpRGB[i]); |
728 |
clipgamut(ctmp, bright(ctmp), CGAMUT, cblack, cwhite); |
729 |
setcolr(orclr[i], colval(ctmp,RED), |
730 |
colval(ctmp,GRN), colval(ctmp,BLU)); |
731 |
if (rawmap) |
732 |
copycolr(cvclr[i], mbclr[i]); |
733 |
else { |
734 |
bresp(ctmp, inpRGB[i]); |
735 |
colortrans(ct2, solmat, ctmp); |
736 |
clipgamut(ct2, bright(ct2), CGAMUT, |
737 |
cblack, cwhite); |
738 |
setcolr(cvclr[i], colval(ct2,RED), |
739 |
colval(ct2,GRN), |
740 |
colval(ct2,BLU)); |
741 |
} |
742 |
} |
743 |
} |
744 |
/* allocate scanline */ |
745 |
scan = (COLR *)malloc(xmax*sizeof(COLR)); |
746 |
if (scan == NULL) { |
747 |
perror(progname); |
748 |
exit(1); |
749 |
} |
750 |
/* finish debug header */ |
751 |
fputformat(COLRFMT, debugfp); |
752 |
putc('\n', debugfp); |
753 |
fprtresolu(xmax, ymax, debugfp); |
754 |
/* write debug picture */ |
755 |
for (y = ymax-1; y >= 0; y--) { |
756 |
for (x = 0; x < xmax; x++) { |
757 |
rg = chartndx(x, y, &i); |
758 |
if (rg == RG_CENT) { |
759 |
if (!(1L<<i & gmtflags) || (x+y)&07) |
760 |
copycolr(scan[x], mbclr[i]); |
761 |
else |
762 |
copycolr(scan[x], blkclr); |
763 |
} else if (rg == RG_BORD || !(1L<<i & inpflags)) |
764 |
copycolr(scan[x], blkclr); |
765 |
else if (rg == RG_ORIG) |
766 |
copycolr(scan[x], orclr[i]); |
767 |
else /* rg == RG_CORR */ |
768 |
copycolr(scan[x], cvclr[i]); |
769 |
} |
770 |
if (fwritecolrs(scan, xmax, debugfp) < 0) { |
771 |
fprintf(stderr, "%s: error writing debugging picture\n", |
772 |
progname); |
773 |
exit(1); |
774 |
} |
775 |
} |
776 |
/* clean up */ |
777 |
fclose(debugfp); |
778 |
free((void *)scan); |
779 |
} |
780 |
|
781 |
|
782 |
getpos(name, bnds, fp) /* get boundary position */ |
783 |
char *name; |
784 |
int bnds[2]; |
785 |
FILE *fp; |
786 |
{ |
787 |
char buf[64]; |
788 |
|
789 |
fprintf(stderr, "\tSelect corner: %s\n", name); |
790 |
if (fgets(buf, sizeof(buf), fp) == NULL || |
791 |
sscanf(buf, "%d %d", &bnds[0], &bnds[1]) != 2) { |
792 |
fprintf(stderr, "%s: read error from display process\n", |
793 |
progname); |
794 |
exit(1); |
795 |
} |
796 |
} |
797 |
|
798 |
|
799 |
pickchartpos(pfn) /* display picture and pick chart location */ |
800 |
char *pfn; |
801 |
{ |
802 |
char combuf[PATH_MAX]; |
803 |
FILE *pfp; |
804 |
|
805 |
sprintf(combuf, DISPCOM, pfn); |
806 |
if ((pfp = popen(combuf, "r")) == NULL) { |
807 |
perror(combuf); |
808 |
exit(1); |
809 |
} |
810 |
fputs("Use middle mouse button to select chart corners:\n", stderr); |
811 |
getpos("upper left (dark skin)", bounds[0], pfp); |
812 |
getpos("upper right (bluish green)", bounds[1], pfp); |
813 |
getpos("lower left (white)", bounds[2], pfp); |
814 |
getpos("lower right (black)", bounds[3], pfp); |
815 |
fputs("Got it -- quit display program.\n", stderr); |
816 |
pclose(pfp); |
817 |
} |