| 1 |
greg |
2.1 |
/* Copyright (c) 1995 Regents of the University of California */ |
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#ifndef lint |
| 4 |
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static char SCCSid[] = "$SunId$ LBL"; |
| 5 |
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#endif |
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| 7 |
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/* |
| 8 |
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* Calibrate a scanned MacBeth Color Checker Chart |
| 9 |
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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 |
| 15 |
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#include <fcntl.h> |
| 16 |
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#endif |
| 17 |
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#include "color.h" |
| 18 |
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#include "resolu.h" |
| 19 |
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#include "pmap.h" |
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| 21 |
greg |
2.4 |
/* MacBeth colors */ |
| 22 |
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#define DarkSkin 0 |
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#define LightSkin 1 |
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#define BlueSky 2 |
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#define Foliage 3 |
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#define BlueFlower 4 |
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#define BluishGreen 5 |
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#define Orange 6 |
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#define PurplishBlue 7 |
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#define ModerateRed 8 |
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#define Purple 9 |
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#define YellowGreen 10 |
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#define OrangeYellow 11 |
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#define Blue 12 |
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#define Green 13 |
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#define Red 14 |
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#define Yellow 15 |
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#define Magenta 16 |
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#define Cyan 17 |
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#define White 18 |
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#define Neutral8 19 |
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#define Neutral65 20 |
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#define Neutral5 21 |
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#define Neutral35 22 |
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#define Black 23 |
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/* computed from 5nm spectral measurements */ |
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/* CIE 1931 2 degree obs, equal-energy white */ |
| 48 |
greg |
2.1 |
float mbxyY[24][3] = { |
| 49 |
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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 */ |
| 69 |
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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 */ |
| 72 |
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{0.3346, 0.3349, 0.0308383} /* Black */ |
| 73 |
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}; |
| 74 |
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| 75 |
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COLOR mbRGB[24]; /* MacBeth RGB values */ |
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| 77 |
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#define NMBNEU 6 /* Number of MacBeth neutral colors */ |
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greg |
2.4 |
short mbneu[NMBNEU] = {Black,Neutral35,Neutral5,Neutral65,Neutral8,White}; |
| 79 |
greg |
2.1 |
|
| 80 |
greg |
2.8 |
#define NEUFLGS (1L<<White|1L<<Neutral8|1L<<Neutral65| \ |
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1L<<Neutral5|1L<<Neutral35|1L<<Black) |
| 82 |
greg |
2.4 |
|
| 83 |
greg |
2.8 |
#define SATFLGS (1L<<Red|1L<<Green|1L<<Blue|1L<<Magenta|1L<<Yellow| \ |
| 84 |
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1L<<Cyan|1L<<Orange|1L<<Purple|1L<<PurplishBlue| \ |
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1L<<YellowGreen|1<<OrangeYellow|1L<<BlueFlower) |
| 86 |
greg |
2.4 |
|
| 87 |
greg |
2.8 |
#define UNSFLGS (1L<<DarkSkin|1L<<LightSkin|1L<<BlueSky|1L<<Foliage| \ |
| 88 |
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1L<<BluishGreen|1L<<ModerateRed) |
| 89 |
greg |
2.7 |
|
| 90 |
greg |
2.8 |
#define REQFLGS NEUFLGS /* need these colors */ |
| 91 |
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#define MODFLGS (NEUFLGS|UNSFLGS) /* should be in gamut */ |
| 92 |
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| 93 |
greg |
2.7 |
#define CENTCVG 0.3 /* measured coverage of square sample */ |
| 94 |
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#define FULLCVG 0.9 /* coverage of entire square */ |
| 95 |
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| 96 |
greg |
2.1 |
int xmax, ymax; /* input image dimensions */ |
| 97 |
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int bounds[4][2]; /* image coordinates of chart corners */ |
| 98 |
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double imgxfm[3][3]; /* coordinate transformation matrix */ |
| 99 |
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| 100 |
greg |
2.7 |
COLOR inpRGB[24]; /* measured or scanned input colors */ |
| 101 |
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long inpflags = 0; /* flags of which colors were input */ |
| 102 |
greg |
2.8 |
long gmtflags = 0; /* flags of out-of-gamut colors */ |
| 103 |
greg |
2.1 |
|
| 104 |
greg |
2.2 |
COLOR bramp[NMBNEU][2]; /* brightness ramp (per primary) */ |
| 105 |
greg |
2.1 |
double solmat[3][3]; /* color mapping matrix */ |
| 106 |
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| 107 |
greg |
2.4 |
FILE *debugfp = NULL; /* debug output picture */ |
| 108 |
greg |
2.1 |
char *progname; |
| 109 |
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| 110 |
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extern char *malloc(); |
| 111 |
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| 112 |
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| 113 |
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main(argc, argv) |
| 114 |
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int argc; |
| 115 |
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char **argv; |
| 116 |
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{ |
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greg |
2.7 |
int inpispic = 1; |
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greg |
2.1 |
int i; |
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| 120 |
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progname = argv[0]; |
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greg |
2.7 |
for (i = 1; i < argc && argv[i][0] == '-'; i++) |
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switch (argv[i][1]) { |
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case 'd': /* debug output */ |
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i++; |
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if (badarg(argc-i, argv+i, "s")) |
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goto userr; |
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if ((debugfp = fopen(argv[i], "w")) == NULL) { |
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perror(argv[i]); |
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exit(1); |
| 130 |
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} |
| 131 |
greg |
2.1 |
#ifdef MSDOS |
| 132 |
greg |
2.7 |
setmode(fileno(debugfp), O_BINARY); |
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greg |
2.1 |
#endif |
| 134 |
greg |
2.7 |
newheader("RADIANCE", debugfp); /* start */ |
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printargs(argc, argv, debugfp); /* header */ |
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break; |
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case 'p': /* picture position */ |
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if (badarg(argc-i-1, argv+i+1, "iiiiiiii")) |
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goto userr; |
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bounds[0][0] = atoi(argv[++i]); |
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bounds[0][1] = atoi(argv[++i]); |
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bounds[1][0] = atoi(argv[++i]); |
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bounds[1][1] = atoi(argv[++i]); |
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bounds[2][0] = atoi(argv[++i]); |
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bounds[2][1] = atoi(argv[++i]); |
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bounds[3][0] = atoi(argv[++i]); |
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bounds[3][1] = atoi(argv[++i]); |
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inpispic = 2; |
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break; |
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case 'c': /* color input */ |
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inpispic = 0; |
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break; |
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default: |
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goto userr; |
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} |
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/* open files */ |
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if (i < argc && freopen(argv[i], "r", stdin) == NULL) { |
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greg |
2.1 |
perror(argv[1]); |
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exit(1); |
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} |
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greg |
2.7 |
if (i+1 < argc && freopen(argv[i+1], "w", stdout) == NULL) { |
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greg |
2.1 |
perror(argv[2]); |
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exit(1); |
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} |
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greg |
2.7 |
if (inpispic) { /* load input picture header */ |
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greg |
2.1 |
#ifdef MSDOS |
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greg |
2.7 |
setmode(fileno(stdin), O_BINARY); |
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greg |
2.1 |
#endif |
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greg |
2.7 |
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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} else { /* else set default xmax and ymax */ |
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xmax = 512; |
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ymax = 2*512/3; |
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greg |
2.1 |
} |
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greg |
2.7 |
if (inpispic != 2) { /* use default boundaries */ |
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greg |
2.1 |
bounds[0][0] = bounds[2][0] = .029*xmax + .5; |
| 180 |
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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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greg |
2.7 |
if (inpispic) /* get picture colors */ |
| 186 |
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getpicture(); |
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else |
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getcolors(); |
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greg |
2.2 |
compute(); /* compute color mapping */ |
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greg |
2.4 |
/* print comment */ |
| 191 |
greg |
2.7 |
printf("{ Color correction file computed by:\n\t"); |
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printargs(argc, argv, stdout); |
| 193 |
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printf("}\n"); |
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greg |
2.1 |
putmapping(); /* put out color mapping */ |
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greg |
2.7 |
if (debugfp != NULL) /* put out debug picture */ |
| 196 |
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if (inpispic) |
| 197 |
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picdebug(); |
| 198 |
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else |
| 199 |
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clrdebug(); |
| 200 |
greg |
2.1 |
exit(0); |
| 201 |
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userr: |
| 202 |
greg |
2.7 |
fprintf(stderr, |
| 203 |
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"Usage: %s [-d dbg.pic][-p xul yul xur yur xll yll xlr ylr] input.pic [output.cal]\n", |
| 204 |
greg |
2.1 |
progname); |
| 205 |
greg |
2.7 |
fprintf(stderr, " or: %s [-d dbg.pic] -c [xyY.dat [output.cal]]\n", |
| 206 |
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progname); |
| 207 |
greg |
2.1 |
exit(1); |
| 208 |
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} |
| 209 |
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| 210 |
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| 211 |
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init() /* initialize */ |
| 212 |
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{ |
| 213 |
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double quad[4][2]; |
| 214 |
greg |
2.7 |
register int i; |
| 215 |
greg |
2.1 |
/* make coordinate transformation */ |
| 216 |
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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]; |
| 219 |
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quad[1][1] = bounds[1][1]; |
| 220 |
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quad[2][0] = bounds[3][0]; |
| 221 |
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quad[2][1] = bounds[3][1]; |
| 222 |
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quad[3][0] = bounds[2][0]; |
| 223 |
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quad[3][1] = bounds[2][1]; |
| 224 |
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| 225 |
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if (pmap_quad_rect(0., 0., 6., 4., quad, imgxfm) == PMAP_BAD) { |
| 226 |
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fprintf(stderr, "%s: bad chart boundaries\n", progname); |
| 227 |
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exit(1); |
| 228 |
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} |
| 229 |
greg |
2.7 |
/* map MacBeth colors to RGB space */ |
| 230 |
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for (i = 0; i < 24; i++) |
| 231 |
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xyY2RGB(mbRGB[i], mbxyY[i]); |
| 232 |
greg |
2.1 |
} |
| 233 |
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| 234 |
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| 235 |
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int |
| 236 |
greg |
2.7 |
chartndx(x, y, cvg) /* find color number for position */ |
| 237 |
greg |
2.1 |
int x, y; |
| 238 |
greg |
2.7 |
double cvg; |
| 239 |
greg |
2.1 |
{ |
| 240 |
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double ipos[3], cpos[3]; |
| 241 |
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int ix, iy; |
| 242 |
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double fx, fy; |
| 243 |
greg |
2.7 |
double cmin, cmax; |
| 244 |
greg |
2.1 |
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| 245 |
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ipos[0] = x; |
| 246 |
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ipos[1] = y; |
| 247 |
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ipos[2] = 1; |
| 248 |
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mx3d_transform(ipos, imgxfm, cpos); |
| 249 |
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cpos[0] /= cpos[2]; |
| 250 |
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cpos[1] /= cpos[2]; |
| 251 |
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if (cpos[0] < 0. || cpos[0] >= 6. || cpos[1] < 0. || cpos[1] >= 4.) |
| 252 |
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return(-1); |
| 253 |
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ix = cpos[0]; |
| 254 |
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iy = cpos[1]; |
| 255 |
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fx = cpos[0] - ix; |
| 256 |
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fy = cpos[1] - iy; |
| 257 |
greg |
2.7 |
cmin = .5*(1.-cvg); |
| 258 |
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cmax = 1. - cmin; |
| 259 |
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if (fx < cmin || fx >= cmax || fy < cmin || fy >= cmax) |
| 260 |
greg |
2.1 |
return(-1); |
| 261 |
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return(iy*6 + ix); |
| 262 |
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} |
| 263 |
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| 264 |
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| 265 |
greg |
2.7 |
getpicture() /* load in picture colors */ |
| 266 |
greg |
2.1 |
{ |
| 267 |
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COLR *scanln; |
| 268 |
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COLOR pval; |
| 269 |
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int ccount[24]; |
| 270 |
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double d; |
| 271 |
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int y; |
| 272 |
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register int x, i; |
| 273 |
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| 274 |
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scanln = (COLR *)malloc(xmax*sizeof(COLR)); |
| 275 |
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if (scanln == NULL) { |
| 276 |
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perror(progname); |
| 277 |
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exit(1); |
| 278 |
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} |
| 279 |
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for (i = 0; i < 24; i++) { |
| 280 |
greg |
2.7 |
setcolor(inpRGB[i], 0., 0., 0.); |
| 281 |
greg |
2.1 |
ccount[i] = 0; |
| 282 |
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} |
| 283 |
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for (y = ymax-1; y >= 0; y--) { |
| 284 |
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if (freadcolrs(scanln, xmax, stdin) < 0) { |
| 285 |
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fprintf(stderr, "%s: error reading input picture\n", |
| 286 |
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progname); |
| 287 |
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exit(1); |
| 288 |
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} |
| 289 |
|
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for (x = 0; x < xmax; x++) { |
| 290 |
greg |
2.7 |
i = chartndx(x, y, CENTCVG); |
| 291 |
greg |
2.1 |
if (i >= 0) { |
| 292 |
|
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colr_color(pval, scanln[x]); |
| 293 |
greg |
2.7 |
addcolor(inpRGB[i], pval); |
| 294 |
greg |
2.1 |
ccount[i]++; |
| 295 |
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} |
| 296 |
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} |
| 297 |
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} |
| 298 |
greg |
2.7 |
for (i = 0; i < 24; i++) { /* compute averages */ |
| 299 |
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if (ccount[i] == 0) |
| 300 |
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continue; |
| 301 |
|
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d = 1./ccount[i]; |
| 302 |
|
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scalecolor(inpRGB[i], d); |
| 303 |
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inpflags |= 1L<<i; |
| 304 |
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} |
| 305 |
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free((char *)scanln); |
| 306 |
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} |
| 307 |
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| 308 |
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| 309 |
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getcolors() /* get xyY colors from standard input */ |
| 310 |
|
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{ |
| 311 |
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int gotwhite = 0; |
| 312 |
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COLOR whiteclr; |
| 313 |
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int n; |
| 314 |
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float xyYin[3]; |
| 315 |
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| 316 |
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while (fgetval(stdin, 'i', &n) == 1) { /* read colors */ |
| 317 |
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if (n < 0 | n > 24 || |
| 318 |
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fgetval(stdin, 'f', &xyYin[0]) != 1 || |
| 319 |
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fgetval(stdin, 'f', &xyYin[1]) != 1 || |
| 320 |
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fgetval(stdin, 'f', &xyYin[2]) != 1 || |
| 321 |
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xyYin[0] < 0. | xyYin[0] > 1. | |
| 322 |
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xyYin[1] < 0. | xyYin[1] > 1.) { |
| 323 |
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fprintf(stderr, "%s: bad color input data\n", |
| 324 |
greg |
2.1 |
progname); |
| 325 |
|
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exit(1); |
| 326 |
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} |
| 327 |
greg |
2.7 |
if (n == 0) { /* calibration white */ |
| 328 |
|
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xyY2RGB(whiteclr, xyYin); |
| 329 |
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gotwhite++; |
| 330 |
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} else { /* standard color */ |
| 331 |
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n--; |
| 332 |
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xyY2RGB(inpRGB[n], xyYin); |
| 333 |
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inpflags |= 1L<<n; |
| 334 |
|
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} |
| 335 |
greg |
2.1 |
} |
| 336 |
greg |
2.7 |
/* normalize colors */ |
| 337 |
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if (!gotwhite) { |
| 338 |
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if (!(inpflags & 1L<<White)) { |
| 339 |
|
|
fprintf(stderr, "%s: missing input for White\n", |
| 340 |
|
|
progname); |
| 341 |
|
|
exit(1); |
| 342 |
|
|
} |
| 343 |
|
|
setcolor(whiteclr, |
| 344 |
|
|
colval(inpRGB[White],RED)/colval(mbRGB[White],RED), |
| 345 |
|
|
colval(inpRGB[White],GRN)/colval(mbRGB[White],GRN), |
| 346 |
|
|
colval(inpRGB[White],BLU)/colval(mbRGB[White],BLU)); |
| 347 |
|
|
} |
| 348 |
|
|
for (n = 0; n < 24; n++) |
| 349 |
|
|
if (inpflags & 1L<<n) |
| 350 |
|
|
setcolor(inpRGB[n], |
| 351 |
|
|
colval(inpRGB[n],RED)/colval(whiteclr,RED), |
| 352 |
|
|
colval(inpRGB[n],GRN)/colval(whiteclr,GRN), |
| 353 |
|
|
colval(inpRGB[n],BLU)/colval(whiteclr,BLU)); |
| 354 |
greg |
2.1 |
} |
| 355 |
|
|
|
| 356 |
|
|
|
| 357 |
greg |
2.2 |
bresp(y, x) /* piecewise linear interpolation of primaries */ |
| 358 |
|
|
COLOR y, x; |
| 359 |
greg |
2.1 |
{ |
| 360 |
greg |
2.2 |
register int i, n; |
| 361 |
greg |
2.1 |
|
| 362 |
greg |
2.2 |
for (i = 0; i < 3; i++) { |
| 363 |
greg |
2.5 |
for (n = 0; n < NMBNEU-2; n++) |
| 364 |
|
|
if (colval(x,i) < colval(bramp[n+1][0],i)) |
| 365 |
|
|
break; |
| 366 |
greg |
2.8 |
colval(y,i) = ((colval(bramp[n+1][0],i) - colval(x,i)) * |
| 367 |
greg |
2.2 |
colval(bramp[n][1],i) + |
| 368 |
|
|
(colval(x,i) - colval(bramp[n][0],i)) * |
| 369 |
|
|
colval(bramp[n+1][1],i)) / |
| 370 |
|
|
(colval(bramp[n+1][0],i) - colval(bramp[n][0],i)); |
| 371 |
|
|
} |
| 372 |
greg |
2.1 |
} |
| 373 |
|
|
|
| 374 |
|
|
|
| 375 |
greg |
2.2 |
compute() /* compute color mapping */ |
| 376 |
greg |
2.1 |
{ |
| 377 |
greg |
2.8 |
COLOR clrin[24], clrout[24]; |
| 378 |
|
|
long cflags; |
| 379 |
|
|
COLOR ctmp; |
| 380 |
|
|
register int i, j, n; |
| 381 |
greg |
2.7 |
/* did we get what we need? */ |
| 382 |
|
|
if ((inpflags & REQFLGS) != REQFLGS) { |
| 383 |
|
|
fprintf(stderr, "%s: missing required input colors\n", |
| 384 |
|
|
progname); |
| 385 |
|
|
exit(1); |
| 386 |
greg |
2.2 |
} |
| 387 |
greg |
2.1 |
/* compute piecewise luminance curve */ |
| 388 |
|
|
for (i = 0; i < NMBNEU; i++) { |
| 389 |
greg |
2.7 |
copycolor(bramp[i][0], inpRGB[mbneu[i]]); |
| 390 |
greg |
2.2 |
copycolor(bramp[i][1], mbRGB[mbneu[i]]); |
| 391 |
greg |
2.1 |
} |
| 392 |
greg |
2.8 |
/* compute color mapping */ |
| 393 |
|
|
do { |
| 394 |
|
|
cflags = inpflags & ~gmtflags; |
| 395 |
|
|
n = 0; /* compute transform matrix */ |
| 396 |
|
|
for (i = 0; i < 24; i++) |
| 397 |
|
|
if (cflags & 1L<<i) { |
| 398 |
|
|
bresp(clrin[n], inpRGB[i]); |
| 399 |
|
|
copycolor(clrout[n], mbRGB[i]); |
| 400 |
|
|
n++; |
| 401 |
|
|
} |
| 402 |
|
|
compsoln(clrin, clrout, n); |
| 403 |
|
|
/* check out-of-gamut colors */ |
| 404 |
|
|
for (i = 0; i < 24; i++) |
| 405 |
|
|
if (cflags & 1L<<i) { |
| 406 |
|
|
cresp(ctmp, mbRGB[i]); |
| 407 |
|
|
for (j = 0; j < 3; j++) |
| 408 |
|
|
if (colval(ctmp,j) <= 0. || |
| 409 |
|
|
colval(ctmp,j) >= 1.) { |
| 410 |
|
|
gmtflags |= 1L<<i; |
| 411 |
|
|
break; |
| 412 |
|
|
} |
| 413 |
|
|
} |
| 414 |
|
|
} while (cflags & gmtflags); |
| 415 |
|
|
if (gmtflags & MODFLGS) |
| 416 |
|
|
fprintf(stderr, |
| 417 |
|
|
"%s: warning - some moderate colors are out of gamut\n", |
| 418 |
|
|
progname); |
| 419 |
greg |
2.2 |
} |
| 420 |
|
|
|
| 421 |
|
|
|
| 422 |
|
|
putmapping() /* put out color mapping for pcomb -f */ |
| 423 |
|
|
{ |
| 424 |
|
|
static char cchar[3] = {'r', 'g', 'b'}; |
| 425 |
|
|
register int i, j; |
| 426 |
greg |
2.1 |
/* print brightness mapping */ |
| 427 |
greg |
2.2 |
for (j = 0; j < 3; j++) { |
| 428 |
|
|
printf("%cxa(i) : select(i", cchar[j]); |
| 429 |
|
|
for (i = 0; i < NMBNEU; i++) |
| 430 |
|
|
printf(",%g", colval(bramp[i][0],j)); |
| 431 |
|
|
printf(");\n"); |
| 432 |
|
|
printf("%cya(i) : select(i", cchar[j]); |
| 433 |
|
|
for (i = 0; i < NMBNEU; i++) |
| 434 |
|
|
printf(",%g", colval(bramp[i][1],j)); |
| 435 |
|
|
printf(");\n"); |
| 436 |
|
|
printf("%c = %ci(1);\n", cchar[j], cchar[j]); |
| 437 |
|
|
printf("%cfi(n) = if(n-%g, %d, if(%cxa(n+1)-%c, n, %cfi(n+1)));\n", |
| 438 |
|
|
cchar[j], NMBNEU-1.5, NMBNEU-1, cchar[j], |
| 439 |
|
|
cchar[j], cchar[j]); |
| 440 |
|
|
printf("%cndx = %cfi(1);\n", cchar[j], cchar[j]); |
| 441 |
|
|
printf("%cn = ((%cxa(%cndx+1)-%c)*%cya(%cndx) + ", |
| 442 |
|
|
cchar[j], cchar[j], cchar[j], |
| 443 |
|
|
cchar[j], cchar[j], cchar[j]); |
| 444 |
|
|
printf("(%c-%cxa(%cndx))*%cya(%cndx+1)) /\n", |
| 445 |
|
|
cchar[j], cchar[j], cchar[j], |
| 446 |
|
|
cchar[j], cchar[j]); |
| 447 |
|
|
printf("\t\t(%cxa(%cndx+1) - %cxa(%cndx)) ;\n", |
| 448 |
|
|
cchar[j], cchar[j], cchar[j], cchar[j]); |
| 449 |
|
|
} |
| 450 |
greg |
2.1 |
/* print color mapping */ |
| 451 |
greg |
2.2 |
printf("ro = %g*rn + %g*gn + %g*bn ;\n", |
| 452 |
greg |
2.3 |
solmat[0][0], solmat[0][1], solmat[0][2]); |
| 453 |
greg |
2.2 |
printf("go = %g*rn + %g*gn + %g*bn ;\n", |
| 454 |
greg |
2.3 |
solmat[1][0], solmat[1][1], solmat[1][2]); |
| 455 |
greg |
2.2 |
printf("bo = %g*rn + %g*gn + %g*bn ;\n", |
| 456 |
greg |
2.3 |
solmat[2][0], solmat[2][1], solmat[2][2]); |
| 457 |
greg |
2.1 |
} |
| 458 |
|
|
|
| 459 |
|
|
|
| 460 |
greg |
2.4 |
compsoln(cin, cout, n) /* solve 3xN system using least-squares */ |
| 461 |
greg |
2.2 |
COLOR cin[], cout[]; |
| 462 |
greg |
2.1 |
int n; |
| 463 |
|
|
{ |
| 464 |
|
|
extern double mx3d_adjoint(), fabs(); |
| 465 |
|
|
double mat[3][3], invmat[3][3]; |
| 466 |
|
|
double det; |
| 467 |
|
|
double colv[3], rowv[3]; |
| 468 |
greg |
2.4 |
register int i, j, k; |
| 469 |
greg |
2.1 |
|
| 470 |
greg |
2.8 |
if (n < 3) { |
| 471 |
|
|
fprintf(stderr, "%s: too few colors to match!\n", progname); |
| 472 |
greg |
2.1 |
exit(1); |
| 473 |
|
|
} |
| 474 |
greg |
2.4 |
if (n == 3) |
| 475 |
|
|
for (i = 0; i < 3; i++) |
| 476 |
|
|
for (j = 0; j < 3; j++) |
| 477 |
|
|
mat[i][j] = colval(cin[j],i); |
| 478 |
|
|
else { /* compute A^t A */ |
| 479 |
|
|
for (i = 0; i < 3; i++) |
| 480 |
|
|
for (j = i; j < 3; j++) { |
| 481 |
|
|
mat[i][j] = 0.; |
| 482 |
|
|
for (k = 0; k < n; k++) |
| 483 |
|
|
mat[i][j] += colval(cin[k],i) * |
| 484 |
|
|
colval(cin[k],j); |
| 485 |
|
|
} |
| 486 |
|
|
for (i = 1; i < 3; i++) /* using symmetry */ |
| 487 |
|
|
for (j = 0; j < i; j++) |
| 488 |
|
|
mat[i][j] = mat[j][i]; |
| 489 |
|
|
} |
| 490 |
greg |
2.1 |
det = mx3d_adjoint(mat, invmat); |
| 491 |
|
|
if (fabs(det) < 1e-4) { |
| 492 |
|
|
fprintf(stderr, "%s: cannot compute color mapping\n", |
| 493 |
|
|
progname); |
| 494 |
|
|
solmat[0][0] = solmat[1][1] = solmat[2][2] = 1.; |
| 495 |
|
|
solmat[0][1] = solmat[0][2] = solmat[1][0] = |
| 496 |
|
|
solmat[1][2] = solmat[2][0] = solmat[2][1] = 0.; |
| 497 |
|
|
return; |
| 498 |
|
|
} |
| 499 |
|
|
for (i = 0; i < 3; i++) |
| 500 |
|
|
for (j = 0; j < 3; j++) |
| 501 |
|
|
invmat[i][j] /= det; |
| 502 |
|
|
for (i = 0; i < 3; i++) { |
| 503 |
greg |
2.4 |
if (n == 3) |
| 504 |
|
|
for (j = 0; j < 3; j++) |
| 505 |
|
|
colv[j] = colval(cout[j],i); |
| 506 |
|
|
else |
| 507 |
|
|
for (j = 0; j < 3; j++) { |
| 508 |
|
|
colv[j] = 0.; |
| 509 |
|
|
for (k = 0; k < n; k++) |
| 510 |
|
|
colv[j] += colval(cout[k],i) * |
| 511 |
|
|
colval(cin[k],j); |
| 512 |
|
|
} |
| 513 |
greg |
2.3 |
mx3d_transform(colv, invmat, rowv); |
| 514 |
greg |
2.1 |
for (j = 0; j < 3; j++) |
| 515 |
greg |
2.3 |
solmat[i][j] = rowv[j]; |
| 516 |
greg |
2.1 |
} |
| 517 |
|
|
} |
| 518 |
|
|
|
| 519 |
greg |
2.3 |
|
| 520 |
greg |
2.1 |
cvtcolor(cout, cin) /* convert color according to our mapping */ |
| 521 |
|
|
COLOR cout, cin; |
| 522 |
|
|
{ |
| 523 |
greg |
2.8 |
COLOR ctmp; |
| 524 |
|
|
|
| 525 |
|
|
bresp(ctmp, cin); |
| 526 |
|
|
cresp(cout, ctmp); |
| 527 |
|
|
if (colval(cout,RED) < 0.) |
| 528 |
|
|
colval(cout,RED) = 0.; |
| 529 |
|
|
if (colval(cout,GRN) < 0.) |
| 530 |
|
|
colval(cout,GRN) = 0.; |
| 531 |
|
|
if (colval(cout,BLU) < 0.) |
| 532 |
|
|
colval(cout,BLU) = 0.; |
| 533 |
|
|
} |
| 534 |
|
|
|
| 535 |
|
|
|
| 536 |
|
|
cresp(cout, cin) /* transform color according to matrix */ |
| 537 |
|
|
COLOR cout, cin; |
| 538 |
|
|
{ |
| 539 |
greg |
2.1 |
double r, g, b; |
| 540 |
|
|
|
| 541 |
greg |
2.8 |
r = colval(cin,0)*solmat[0][0] + colval(cin,1)*solmat[0][1] |
| 542 |
|
|
+ colval(cin,2)*solmat[0][2]; |
| 543 |
|
|
g = colval(cin,0)*solmat[1][0] + colval(cin,1)*solmat[1][1] |
| 544 |
|
|
+ colval(cin,2)*solmat[1][2]; |
| 545 |
|
|
b = colval(cin,0)*solmat[2][0] + colval(cin,1)*solmat[2][1] |
| 546 |
|
|
+ colval(cin,2)*solmat[2][2]; |
| 547 |
greg |
2.2 |
setcolor(cout, r, g, b); |
| 548 |
greg |
2.1 |
} |
| 549 |
|
|
|
| 550 |
|
|
|
| 551 |
greg |
2.7 |
xyY2RGB(rgbout, xyYin) /* convert xyY to RGB */ |
| 552 |
|
|
COLOR rgbout; |
| 553 |
|
|
register float xyYin[3]; |
| 554 |
greg |
2.1 |
{ |
| 555 |
greg |
2.7 |
COLOR ctmp; |
| 556 |
|
|
double d; |
| 557 |
|
|
|
| 558 |
|
|
d = xyYin[2] / xyYin[1]; |
| 559 |
|
|
ctmp[0] = xyYin[0] * d; |
| 560 |
|
|
ctmp[1] = xyYin[2]; |
| 561 |
|
|
ctmp[2] = (1. - xyYin[0] - xyYin[1]) * d; |
| 562 |
|
|
cie_rgb(rgbout, ctmp); |
| 563 |
|
|
} |
| 564 |
|
|
|
| 565 |
|
|
|
| 566 |
|
|
picdebug() /* put out debugging picture */ |
| 567 |
|
|
{ |
| 568 |
greg |
2.8 |
static COLOR blkcol = BLKCOLOR; |
| 569 |
greg |
2.1 |
COLOR *scan; |
| 570 |
|
|
int y; |
| 571 |
|
|
register int x, i; |
| 572 |
|
|
|
| 573 |
|
|
if (fseek(stdin, 0L, 0) == EOF) { |
| 574 |
|
|
fprintf(stderr, "%s: cannot seek on input picture\n", progname); |
| 575 |
|
|
exit(1); |
| 576 |
|
|
} |
| 577 |
|
|
getheader(stdin, NULL, NULL); /* skip input header */ |
| 578 |
|
|
fgetresolu(&xmax, &ymax, stdin); |
| 579 |
|
|
/* allocate scanline */ |
| 580 |
|
|
scan = (COLOR *)malloc(xmax*sizeof(COLOR)); |
| 581 |
|
|
if (scan == NULL) { |
| 582 |
|
|
perror(progname); |
| 583 |
|
|
exit(1); |
| 584 |
|
|
} |
| 585 |
|
|
/* finish debug header */ |
| 586 |
greg |
2.5 |
fputformat(COLRFMT, debugfp); |
| 587 |
greg |
2.1 |
putc('\n', debugfp); |
| 588 |
|
|
fprtresolu(xmax, ymax, debugfp); |
| 589 |
greg |
2.7 |
/* write debug picture */ |
| 590 |
greg |
2.1 |
for (y = ymax-1; y >= 0; y--) { |
| 591 |
|
|
if (freadscan(scan, xmax, stdin) < 0) { |
| 592 |
|
|
fprintf(stderr, "%s: error rereading input picture\n", |
| 593 |
|
|
progname); |
| 594 |
|
|
exit(1); |
| 595 |
|
|
} |
| 596 |
|
|
for (x = 0; x < xmax; x++) { |
| 597 |
greg |
2.7 |
i = chartndx(x, y, CENTCVG); |
| 598 |
greg |
2.1 |
if (i < 0) |
| 599 |
|
|
cvtcolor(scan[x], scan[x]); |
| 600 |
greg |
2.8 |
else if (!(1L<<i & gmtflags) || (x+y)&07) |
| 601 |
|
|
copycolor(scan[x], mbRGB[i]); |
| 602 |
greg |
2.1 |
else |
| 603 |
greg |
2.8 |
copycolor(scan[x], blkcol); |
| 604 |
greg |
2.1 |
} |
| 605 |
|
|
if (fwritescan(scan, xmax, debugfp) < 0) { |
| 606 |
|
|
fprintf(stderr, "%s: error writing debugging picture\n", |
| 607 |
|
|
progname); |
| 608 |
|
|
exit(1); |
| 609 |
|
|
} |
| 610 |
|
|
} |
| 611 |
greg |
2.7 |
/* clean up */ |
| 612 |
|
|
fclose(debugfp); |
| 613 |
|
|
free((char *)scan); |
| 614 |
|
|
} |
| 615 |
|
|
|
| 616 |
|
|
|
| 617 |
|
|
clrdebug() /* put out debug picture from color input */ |
| 618 |
|
|
{ |
| 619 |
|
|
static COLR blkclr = BLKCOLR; |
| 620 |
|
|
COLR mbclr[24], cvclr[24]; |
| 621 |
|
|
COLR *scan; |
| 622 |
|
|
COLOR ctmp; |
| 623 |
|
|
int y; |
| 624 |
|
|
register int i, x; |
| 625 |
|
|
/* convert colors */ |
| 626 |
|
|
for (i = 0; i < 24; i++) { |
| 627 |
|
|
setcolr(mbclr[i], colval(mbRGB[i],RED), |
| 628 |
|
|
colval(mbRGB[i],GRN), colval(mbRGB[i],BLU)); |
| 629 |
|
|
if (inpflags & 1L<<i) { |
| 630 |
|
|
cvtcolor(ctmp, inpRGB[i]); |
| 631 |
|
|
setcolr(cvclr[i], colval(ctmp,RED), |
| 632 |
|
|
colval(ctmp,GRN), colval(ctmp,BLU)); |
| 633 |
|
|
} |
| 634 |
|
|
} |
| 635 |
|
|
/* allocate scanline */ |
| 636 |
|
|
scan = (COLR *)malloc(xmax*sizeof(COLR)); |
| 637 |
|
|
if (scan == NULL) { |
| 638 |
|
|
perror(progname); |
| 639 |
|
|
exit(1); |
| 640 |
|
|
} |
| 641 |
|
|
/* finish debug header */ |
| 642 |
|
|
fputformat(COLRFMT, debugfp); |
| 643 |
|
|
putc('\n', debugfp); |
| 644 |
|
|
fprtresolu(xmax, ymax, debugfp); |
| 645 |
|
|
/* write debug picture */ |
| 646 |
|
|
for (y = ymax-1; y >= 0; y--) { |
| 647 |
|
|
for (x = 0; x < xmax; x++) |
| 648 |
greg |
2.8 |
if ((i = chartndx(x, y, CENTCVG)) >= 0) { |
| 649 |
|
|
if (!(1L<<i & gmtflags) || (x+y)&07) |
| 650 |
|
|
copycolr(scan[x], mbclr[i]); |
| 651 |
|
|
else |
| 652 |
|
|
copycolr(scan[x], blkclr); |
| 653 |
|
|
} else if ((i = chartndx(x, y, FULLCVG)) >= 0 && |
| 654 |
greg |
2.7 |
inpflags & 1L<<i) |
| 655 |
|
|
copycolr(scan[x], cvclr[i]); |
| 656 |
|
|
else |
| 657 |
|
|
copycolr(scan[x], blkclr); |
| 658 |
|
|
if (fwritecolrs(scan, xmax, debugfp) < 0) { |
| 659 |
|
|
fprintf(stderr, "%s: error writing debugging picture\n", |
| 660 |
|
|
progname); |
| 661 |
|
|
exit(1); |
| 662 |
|
|
} |
| 663 |
|
|
} |
| 664 |
|
|
/* clean up */ |
| 665 |
|
|
fclose(debugfp); |
| 666 |
greg |
2.1 |
free((char *)scan); |
| 667 |
|
|
} |
