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greg |
2.1 |
/* Copyright (c) 1995 Regents of the University of California */
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#ifndef lint
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static char SCCSid[] = "$SunId$ LBL";
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#endif
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/*
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* Calibrate a scanned MacBeth Color Checker Chart
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*
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* Produce a .cal file suitable for use with pcomb.
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*/
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#include <stdio.h>
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#ifdef MSDOS
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#include <fcntl.h>
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#endif
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#include "color.h"
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#include "resolu.h"
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#include "pmap.h"
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/* MacBeth colors (CIE 1931, absolute white) */
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/* computed from spectral measurements */
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float mbxyY[24][3] = {
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{0.462, 0.3769, 0.0932961}, /* DarkSkin */
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{0.4108, 0.3542, 0.410348}, /* LightSkin */
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{0.2626, 0.267, 0.181554}, /* BlueSky */
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{0.36, 0.4689, 0.108447}, /* Foliage */
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{0.2977, 0.2602, 0.248407}, /* BlueFlower */
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{0.2719, 0.3485, 0.401156}, /* BluishGreen */
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{0.52, 0.4197, 0.357899}, /* Orange */
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{0.229, 0.1866, 0.103911}, /* PurplishBlue */
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{0.4909, 0.3262, 0.242615}, /* ModerateRed */
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{0.3361, 0.2249, 0.0600102}, /* Purple */
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{0.3855, 0.4874, 0.42963}, /* YellowGreen */
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{0.4853, 0.4457, 0.476343}, /* OrangeYellow */
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{0.2026, 0.1369, 0.0529249}, /* Blue */
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{0.3007, 0.4822, 0.221226}, /* Green */
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{0.5805, 0.3238, 0.162167}, /* Red */
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{0.4617, 0.472, 0.64909}, /* Yellow */
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{0.4178, 0.2625, 0.233662}, /* Magenta */
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{0.2038, 0.2508, 0.167275}, /* Cyan */
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{0.3358, 0.337, 0.916877}, /* White */
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{0.3338, 0.3348, 0.604678}, /* Neutral.8 */
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{0.3333, 0.3349, 0.364566}, /* Neutral.65 */
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{0.3353, 0.3359, 0.200238}, /* Neutral.5 */
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{0.3363, 0.336, 0.0878721}, /* Neutral.35 */
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{0.3346, 0.3349, 0.0308383} /* Black */
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};
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COLOR mbRGB[24]; /* MacBeth RGB values */
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#define NMBNEU 6 /* Number of MacBeth neutral colors */
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short mbneu[NMBNEU] = {23,22,21,20,19,18};
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greg |
2.3 |
#define NMBMOD 16 /* Number of MacBeth unsaturated colors */
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short mbmod[NMBMOD] = {0,1,2,3,4,5,6,7,8,9,10,11,19,20,21,22};
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greg |
2.1 |
#define NMBSAT 6 /* Number of MacBeth saturated colors */
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short mbsat[NMBSAT] = {14,12,13,15,16,17};
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int xmax, ymax; /* input image dimensions */
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int bounds[4][2]; /* image coordinates of chart corners */
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double imgxfm[3][3]; /* coordinate transformation matrix */
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COLOR picRGB[24]; /* picture colors */
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greg |
2.2 |
COLOR bramp[NMBNEU][2]; /* brightness ramp (per primary) */
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greg |
2.1 |
double solmat[3][3]; /* color mapping matrix */
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FILE *debugfp = NULL;
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char *progname;
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extern char *malloc();
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main(argc, argv)
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int argc;
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char **argv;
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{
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int i;
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progname = argv[0];
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if (argc > 2 && !strcmp(argv[1], "-d")) { /* debug output */
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if ((debugfp = fopen(argv[2], "w")) == NULL) {
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perror(argv[2]);
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exit(1);
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}
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#ifdef MSDOS
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setmode(fileno(debugfp), O_BINARY);
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#endif
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newheader("RADIANCE", debugfp);
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printargs(argc, argv, debugfp);
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argv += 2;
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argc -= 2;
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}
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if (argc != 3 && argc != 11)
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goto userr;
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if (strcmp(argv[1], "-") && freopen(argv[1], "r", stdin) == NULL) {
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perror(argv[1]);
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exit(1);
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}
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if (strcmp(argv[2], "-") && freopen(argv[2], "w", stdout) == NULL) {
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perror(argv[2]);
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exit(1);
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}
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#ifdef MSDOS
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setmode(fileno(stdin), O_BINARY);
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#endif
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if (checkheader(stdin, COLRFMT, NULL) < 0 ||
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fgetresolu(&xmax, &ymax, stdin) < 0) {
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fprintf(stderr, "%s: bad input picture\n", progname);
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exit(1);
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}
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/* get chart boundaries */
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if (argc == 11) {
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for (i = 0; i < 4; i++) {
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if (!isint(argv[2*i+3]) | !isint(argv[2*i+4]))
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goto userr;
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bounds[i][0] = atoi(argv[2*i+3]);
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bounds[i][1] = atoi(argv[2*i+4]);
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}
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} else {
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bounds[0][0] = bounds[2][0] = .029*xmax + .5;
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bounds[0][1] = bounds[1][1] = .956*ymax + .5;
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bounds[1][0] = bounds[3][0] = .971*xmax + .5;
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bounds[2][1] = bounds[3][1] = .056*ymax + .5;
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}
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init(); /* initialize */
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getcolors(); /* get picture colors */
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greg |
2.2 |
compute(); /* compute color mapping */
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greg |
2.1 |
putmapping(); /* put out color mapping */
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putdebug(); /* put out debug picture */
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exit(0);
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userr:
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fprintf(stderr, "Usage: %s [-d dbg.pic] input.pic output.cal [xul yul xur yur xll yll xlr ylr]\n",
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progname);
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exit(1);
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}
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init() /* initialize */
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{
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double quad[4][2];
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/* make coordinate transformation */
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quad[0][0] = bounds[0][0];
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quad[0][1] = bounds[0][1];
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quad[1][0] = bounds[1][0];
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quad[1][1] = bounds[1][1];
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quad[2][0] = bounds[3][0];
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quad[2][1] = bounds[3][1];
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quad[3][0] = bounds[2][0];
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quad[3][1] = bounds[2][1];
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if (pmap_quad_rect(0., 0., 6., 4., quad, imgxfm) == PMAP_BAD) {
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fprintf(stderr, "%s: bad chart boundaries\n", progname);
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exit(1);
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}
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}
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int
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chartndx(x, y) /* find color number for position */
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int x, y;
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{
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double ipos[3], cpos[3];
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int ix, iy;
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double fx, fy;
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ipos[0] = x;
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ipos[1] = y;
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ipos[2] = 1;
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mx3d_transform(ipos, imgxfm, cpos);
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cpos[0] /= cpos[2];
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cpos[1] /= cpos[2];
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if (cpos[0] < 0. || cpos[0] >= 6. || cpos[1] < 0. || cpos[1] >= 4.)
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return(-1);
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ix = cpos[0];
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iy = cpos[1];
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fx = cpos[0] - ix;
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fy = cpos[1] - iy;
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if (fx < .35 || fx >= .65 || fy < .35 || fy >= .65)
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return(-1);
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return(iy*6 + ix);
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}
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getcolors() /* load in picture colors */
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{
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COLR *scanln;
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COLOR pval;
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int ccount[24];
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double d;
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int y;
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register int x, i;
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scanln = (COLR *)malloc(xmax*sizeof(COLR));
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if (scanln == NULL) {
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perror(progname);
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exit(1);
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| 198 |
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}
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for (i = 0; i < 24; i++) {
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setcolor(picRGB[i], 0., 0., 0.);
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ccount[i] = 0;
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}
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for (y = ymax-1; y >= 0; y--) {
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if (freadcolrs(scanln, xmax, stdin) < 0) {
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fprintf(stderr, "%s: error reading input picture\n",
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progname);
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exit(1);
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}
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for (x = 0; x < xmax; x++) {
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i = chartndx(x, y);
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if (i >= 0) {
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colr_color(pval, scanln[x]);
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addcolor(picRGB[i], pval);
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ccount[i]++;
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}
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}
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}
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for (i = 0; i < 24; i++) {
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if (ccount[i] == 0) {
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fprintf(stderr, "%s: bad chart boundaries\n",
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progname);
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exit(1);
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}
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d = 1.0/ccount[i];
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scalecolor(picRGB[i], d);
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}
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free((char *)scanln);
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}
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greg |
2.2 |
bresp(y, x) /* piecewise linear interpolation of primaries */
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COLOR y, x;
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| 233 |
greg |
2.1 |
{
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| 234 |
greg |
2.3 |
double cv[3];
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| 235 |
greg |
2.2 |
register int i, n;
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| 236 |
greg |
2.1 |
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greg |
2.2 |
for (i = 0; i < 3; i++) {
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n = NMBNEU;
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while (n > 0 && colval(x,i) < colval(bramp[--n][0],i))
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;
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greg |
2.3 |
cv[i] = ((colval(bramp[n+1][0],i) - colval(x,i)) *
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greg |
2.2 |
colval(bramp[n][1],i) +
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(colval(x,i) - colval(bramp[n][0],i)) *
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colval(bramp[n+1][1],i)) /
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(colval(bramp[n+1][0],i) - colval(bramp[n][0],i));
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greg |
2.3 |
if (cv[i] < 0.) cv[i] = 0.;
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| 247 |
greg |
2.2 |
}
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| 248 |
greg |
2.3 |
setcolor(y, cv[0], cv[1], cv[2]);
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greg |
2.1 |
}
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| 252 |
greg |
2.2 |
compute() /* compute color mapping */
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| 253 |
greg |
2.1 |
{
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| 254 |
greg |
2.2 |
COLOR clrin[NMBMOD], clrout[NMBMOD];
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| 255 |
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COLOR ctmp;
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| 256 |
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double d;
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| 257 |
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register int i;
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/* map MacBeth colors to RGB space */
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for (i = 0; i < 24; i++) {
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d = mbxyY[i][2] / mbxyY[i][1];
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ctmp[0] = mbxyY[i][0] * d;
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| 262 |
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ctmp[1] = mbxyY[i][2];
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| 263 |
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ctmp[2] = (1. - mbxyY[i][0] - mbxyY[i][1]) * d;
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| 264 |
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cie_rgb(mbRGB[i], ctmp);
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| 265 |
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}
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| 266 |
greg |
2.1 |
/* compute piecewise luminance curve */
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| 267 |
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for (i = 0; i < NMBNEU; i++) {
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| 268 |
greg |
2.2 |
copycolor(bramp[i][0], picRGB[mbneu[i]]);
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| 269 |
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copycolor(bramp[i][1], mbRGB[mbneu[i]]);
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| 270 |
greg |
2.1 |
}
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| 271 |
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/* compute color matrix */
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| 272 |
greg |
2.2 |
for (i = 0; i < NMBMOD; i++) {
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| 273 |
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bresp(clrin[i], picRGB[mbmod[i]]);
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| 274 |
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copycolor(clrout[i], mbRGB[mbmod[i]]);
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| 275 |
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}
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| 276 |
greg |
2.1 |
compsoln(clrin, clrout, NMBMOD);
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| 277 |
greg |
2.2 |
}
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| 278 |
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| 279 |
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| 280 |
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putmapping() /* put out color mapping for pcomb -f */
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| 281 |
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{
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| 282 |
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static char cchar[3] = {'r', 'g', 'b'};
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| 283 |
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register int i, j;
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| 284 |
greg |
2.1 |
/* print brightness mapping */
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| 285 |
greg |
2.2 |
for (j = 0; j < 3; j++) {
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| 286 |
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printf("%cxa(i) : select(i", cchar[j]);
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| 287 |
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for (i = 0; i < NMBNEU; i++)
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| 288 |
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printf(",%g", colval(bramp[i][0],j));
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| 289 |
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printf(");\n");
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| 290 |
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printf("%cya(i) : select(i", cchar[j]);
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| 291 |
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for (i = 0; i < NMBNEU; i++)
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| 292 |
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printf(",%g", colval(bramp[i][1],j));
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| 293 |
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printf(");\n");
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| 294 |
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printf("%c = %ci(1);\n", cchar[j], cchar[j]);
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| 295 |
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printf("%cfi(n) = if(n-%g, %d, if(%cxa(n+1)-%c, n, %cfi(n+1)));\n",
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| 296 |
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cchar[j], NMBNEU-1.5, NMBNEU-1, cchar[j],
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| 297 |
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cchar[j], cchar[j]);
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| 298 |
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printf("%cndx = %cfi(1);\n", cchar[j], cchar[j]);
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| 299 |
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printf("%cn = ((%cxa(%cndx+1)-%c)*%cya(%cndx) + ",
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| 300 |
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cchar[j], cchar[j], cchar[j],
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| 301 |
|
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cchar[j], cchar[j], cchar[j]);
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| 302 |
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printf("(%c-%cxa(%cndx))*%cya(%cndx+1)) /\n",
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| 303 |
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cchar[j], cchar[j], cchar[j],
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| 304 |
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cchar[j], cchar[j]);
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| 305 |
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printf("\t\t(%cxa(%cndx+1) - %cxa(%cndx)) ;\n",
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| 306 |
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cchar[j], cchar[j], cchar[j], cchar[j]);
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| 307 |
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}
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| 308 |
greg |
2.1 |
/* print color mapping */
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| 309 |
greg |
2.2 |
printf("ro = %g*rn + %g*gn + %g*bn ;\n",
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| 310 |
greg |
2.3 |
solmat[0][0], solmat[0][1], solmat[0][2]);
|
| 311 |
greg |
2.2 |
printf("go = %g*rn + %g*gn + %g*bn ;\n",
|
| 312 |
greg |
2.3 |
solmat[1][0], solmat[1][1], solmat[1][2]);
|
| 313 |
greg |
2.2 |
printf("bo = %g*rn + %g*gn + %g*bn ;\n",
|
| 314 |
greg |
2.3 |
solmat[2][0], solmat[2][1], solmat[2][2]);
|
| 315 |
greg |
2.1 |
}
|
| 316 |
|
|
|
| 317 |
|
|
|
| 318 |
greg |
2.3 |
#if NMBMOD == 3
|
| 319 |
greg |
2.1 |
compsoln(cin, cout, n) /* solve 3x3 system */
|
| 320 |
greg |
2.2 |
COLOR cin[], cout[];
|
| 321 |
greg |
2.1 |
int n;
|
| 322 |
|
|
{
|
| 323 |
|
|
extern double mx3d_adjoint(), fabs();
|
| 324 |
|
|
double mat[3][3], invmat[3][3];
|
| 325 |
|
|
double det;
|
| 326 |
|
|
double colv[3], rowv[3];
|
| 327 |
|
|
register int i, j;
|
| 328 |
|
|
|
| 329 |
|
|
if (n != 3) {
|
| 330 |
|
|
fprintf(stderr, "%s: inconsistent code!\n", progname);
|
| 331 |
|
|
exit(1);
|
| 332 |
|
|
}
|
| 333 |
|
|
for (i = 0; i < 3; i++)
|
| 334 |
|
|
for (j = 0; j < 3; j++)
|
| 335 |
greg |
2.2 |
mat[i][j] = colval(cin[j],i);
|
| 336 |
greg |
2.1 |
det = mx3d_adjoint(mat, invmat);
|
| 337 |
|
|
if (fabs(det) < 1e-4) {
|
| 338 |
|
|
fprintf(stderr, "%s: cannot compute color mapping\n",
|
| 339 |
|
|
progname);
|
| 340 |
|
|
solmat[0][0] = solmat[1][1] = solmat[2][2] = 1.;
|
| 341 |
|
|
solmat[0][1] = solmat[0][2] = solmat[1][0] =
|
| 342 |
|
|
solmat[1][2] = solmat[2][0] = solmat[2][1] = 0.;
|
| 343 |
|
|
return;
|
| 344 |
|
|
}
|
| 345 |
|
|
for (i = 0; i < 3; i++)
|
| 346 |
|
|
for (j = 0; j < 3; j++)
|
| 347 |
|
|
invmat[i][j] /= det;
|
| 348 |
|
|
for (i = 0; i < 3; i++) {
|
| 349 |
|
|
for (j = 0; j < 3; j++)
|
| 350 |
greg |
2.3 |
colv[j] = colval(cout[j],i);
|
| 351 |
|
|
mx3d_transform(colv, invmat, rowv);
|
| 352 |
greg |
2.1 |
for (j = 0; j < 3; j++)
|
| 353 |
greg |
2.3 |
solmat[i][j] = rowv[j];
|
| 354 |
greg |
2.1 |
}
|
| 355 |
|
|
}
|
| 356 |
greg |
2.3 |
#else
|
| 357 |
|
|
compsoln(cin, cout, n) /* solve 3xN system (N > 3) */
|
| 358 |
|
|
COLOR cin[], cout[];
|
| 359 |
|
|
int n;
|
| 360 |
|
|
{
|
| 361 |
|
|
double *au[NMBMOD], *v[3], vv[3][3], auv[NMBMOD][3], w[3];
|
| 362 |
|
|
double b[NMBMOD];
|
| 363 |
|
|
register int i, j;
|
| 364 |
greg |
2.1 |
|
| 365 |
greg |
2.3 |
if (n > NMBMOD) {
|
| 366 |
|
|
fprintf(stderr, "%s: inconsistent code!\n", progname);
|
| 367 |
|
|
exit(1);
|
| 368 |
|
|
}
|
| 369 |
|
|
for (i = 0; i < n; i++) /* assign rectangular matrix A */
|
| 370 |
|
|
for (j = 0; j < 3; j++)
|
| 371 |
|
|
auv[i][j] = colval(cin[i],j);
|
| 372 |
|
|
/* svdcmp indexing requires pointer offsets */
|
| 373 |
|
|
for (j = 0; j < 3; j++)
|
| 374 |
|
|
v[j] = vv[j] - 1;
|
| 375 |
|
|
for (i = 0; i < n; i++)
|
| 376 |
|
|
au[i] = auv[i] - 1;
|
| 377 |
|
|
/* compute singular value decomposition */
|
| 378 |
|
|
fprintf(stderr, "A:\n");
|
| 379 |
|
|
for (i = 1; i <= n; i++)
|
| 380 |
|
|
fprintf(stderr, "%g %g %g\n", (au-1)[i][1], (au-1)[i][2], (au-1)[i][3]);
|
| 381 |
|
|
svdcmp(au-1, n, 3, w-1, v-1);
|
| 382 |
|
|
fprintf(stderr, "U:\n");
|
| 383 |
|
|
for (i = 0; i < n; i++)
|
| 384 |
|
|
fprintf(stderr, "%g %g %g\n", auv[i][0], auv[i][1], auv[i][2]);
|
| 385 |
|
|
fprintf(stderr, "V:\n");
|
| 386 |
|
|
for (i = 0; i < 3; i++)
|
| 387 |
|
|
fprintf(stderr, "%g %g %g\n", vv[i][0], vv[i][1], vv[i][2]);
|
| 388 |
|
|
fprintf(stderr, "W: %g %g %g\n", w[0], w[1], w[2]);
|
| 389 |
|
|
/* zero out small weights */
|
| 390 |
|
|
for (j = 0; j < 3; j++)
|
| 391 |
|
|
if (w[j] < 1e-4)
|
| 392 |
|
|
w[j] = 0.;
|
| 393 |
|
|
/* back substitution for each row vector */
|
| 394 |
|
|
for (j = 0; j < 3; j++) {
|
| 395 |
|
|
for (i = 0; i < n; i++)
|
| 396 |
|
|
b[i] = colval(cout[i],j);
|
| 397 |
|
|
svbksb(au-1, w-1, v-1, n, 3, b-1, solmat[j]-1);
|
| 398 |
|
|
}
|
| 399 |
|
|
}
|
| 400 |
|
|
#endif
|
| 401 |
greg |
2.1 |
|
| 402 |
greg |
2.3 |
|
| 403 |
greg |
2.1 |
cvtcolor(cout, cin) /* convert color according to our mapping */
|
| 404 |
|
|
COLOR cout, cin;
|
| 405 |
|
|
{
|
| 406 |
|
|
double r, g, b;
|
| 407 |
|
|
|
| 408 |
greg |
2.2 |
bresp(cout, cin);
|
| 409 |
greg |
2.3 |
r = colval(cout,0)*solmat[0][0] + colval(cout,1)*solmat[0][1]
|
| 410 |
|
|
+ colval(cout,2)*solmat[0][2];
|
| 411 |
greg |
2.2 |
if (r < 0) r = 0;
|
| 412 |
greg |
2.3 |
g = colval(cout,0)*solmat[1][0] + colval(cout,1)*solmat[1][1]
|
| 413 |
|
|
+ colval(cout,2)*solmat[1][2];
|
| 414 |
greg |
2.2 |
if (g < 0) g = 0;
|
| 415 |
greg |
2.3 |
b = colval(cout,0)*solmat[2][0] + colval(cout,1)*solmat[2][1]
|
| 416 |
greg |
2.2 |
+ colval(cout,2)*solmat[2][2];
|
| 417 |
|
|
if (b < 0) b = 0;
|
| 418 |
|
|
setcolor(cout, r, g, b);
|
| 419 |
greg |
2.1 |
}
|
| 420 |
|
|
|
| 421 |
|
|
|
| 422 |
|
|
putdebug() /* put out debugging picture */
|
| 423 |
|
|
{
|
| 424 |
|
|
COLOR *scan;
|
| 425 |
|
|
int y;
|
| 426 |
|
|
register int x, i;
|
| 427 |
|
|
|
| 428 |
|
|
if (debugfp == NULL)
|
| 429 |
|
|
return;
|
| 430 |
|
|
if (fseek(stdin, 0L, 0) == EOF) {
|
| 431 |
|
|
fprintf(stderr, "%s: cannot seek on input picture\n", progname);
|
| 432 |
|
|
exit(1);
|
| 433 |
|
|
}
|
| 434 |
|
|
getheader(stdin, NULL, NULL); /* skip input header */
|
| 435 |
|
|
fgetresolu(&xmax, &ymax, stdin);
|
| 436 |
|
|
/* allocate scanline */
|
| 437 |
|
|
scan = (COLOR *)malloc(xmax*sizeof(COLOR));
|
| 438 |
|
|
if (scan == NULL) {
|
| 439 |
|
|
perror(progname);
|
| 440 |
|
|
exit(1);
|
| 441 |
|
|
}
|
| 442 |
|
|
/* finish debug header */
|
| 443 |
|
|
putc('\n', debugfp);
|
| 444 |
|
|
fprtresolu(xmax, ymax, debugfp);
|
| 445 |
|
|
for (y = ymax-1; y >= 0; y--) {
|
| 446 |
|
|
if (freadscan(scan, xmax, stdin) < 0) {
|
| 447 |
|
|
fprintf(stderr, "%s: error rereading input picture\n",
|
| 448 |
|
|
progname);
|
| 449 |
|
|
exit(1);
|
| 450 |
|
|
}
|
| 451 |
|
|
for (x = 0; x < xmax; x++) {
|
| 452 |
|
|
i = chartndx(x, y);
|
| 453 |
|
|
if (i < 0)
|
| 454 |
|
|
cvtcolor(scan[x], scan[x]);
|
| 455 |
|
|
else
|
| 456 |
|
|
copycolor(scan[x], mbRGB[i]);
|
| 457 |
|
|
}
|
| 458 |
|
|
if (fwritescan(scan, xmax, debugfp) < 0) {
|
| 459 |
|
|
fprintf(stderr, "%s: error writing debugging picture\n",
|
| 460 |
|
|
progname);
|
| 461 |
|
|
exit(1);
|
| 462 |
|
|
}
|
| 463 |
|
|
}
|
| 464 |
|
|
free((char *)scan);
|
| 465 |
|
|
}
|
