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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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/* MacBeth colors */ |
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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 */ |
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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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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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#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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#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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short mbneu[NMBNEU] = {Black,Neutral35,Neutral5,Neutral65,Neutral8,White}; |
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#define NMBMOD 17 /* Number of MacBeth unsaturated colors */ |
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short mbmod[NMBMOD] = { |
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DarkSkin,LightSkin,BlueSky,Foliage,BlueFlower,BluishGreen, |
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Orange,PurplishBlue,ModerateRed,Purple,YellowGreen, |
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Black,Neutral35,Neutral5,Neutral65,Neutral8,White |
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}; |
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|
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#define NMBSAT 8 /* Number of MacBeth saturated colors */ |
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short mbsat[NMBSAT] = { |
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Red,Green,Blue,Magenta,Yellow,Cyan, |
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Orange,OrangeYellow |
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}; |
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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 bramp[NMBNEU][2]; /* brightness ramp (per primary) */ |
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double solmat[3][3]; /* color mapping matrix */ |
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FILE *debugfp = NULL; |
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FILE *debugfp = NULL; /* debug output picture */ |
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char *progname; |
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extern char *malloc(); |
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init(); /* initialize */ |
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getcolors(); /* get picture colors */ |
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compute(); /* compute color mapping */ |
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/* print comment */ |
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printf("{ Color correction file computed by %s }\n", progname); |
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printf("{ from scanned MacBetch color chart %s }\n", argv[1]); |
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putmapping(); /* put out color mapping */ |
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putdebug(); /* put out debug picture */ |
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exit(0); |
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} |
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#if NMBMOD == 3 |
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compsoln(cin, cout, n) /* solve 3x3 system */ |
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compsoln(cin, cout, n) /* solve 3xN system using least-squares */ |
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COLOR cin[], cout[]; |
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int n; |
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{ |
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double mat[3][3], invmat[3][3]; |
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double det; |
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double colv[3], rowv[3]; |
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register int i, j; |
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register int i, j, k; |
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if (n != 3) { |
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if (n < 3 | n > NMBMOD) { |
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fprintf(stderr, "%s: inconsistent code!\n", progname); |
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exit(1); |
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} |
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for (i = 0; i < 3; i++) |
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for (j = 0; j < 3; j++) |
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mat[i][j] = colval(cin[j],i); |
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if (n == 3) |
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for (i = 0; i < 3; i++) |
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for (j = 0; j < 3; j++) |
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mat[i][j] = colval(cin[j],i); |
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else { /* compute A^t A */ |
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for (i = 0; i < 3; i++) |
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for (j = i; j < 3; j++) { |
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mat[i][j] = 0.; |
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for (k = 0; k < n; k++) |
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mat[i][j] += colval(cin[k],i) * |
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colval(cin[k],j); |
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} |
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for (i = 1; i < 3; i++) /* using symmetry */ |
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for (j = 0; j < i; j++) |
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mat[i][j] = mat[j][i]; |
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} |
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det = mx3d_adjoint(mat, invmat); |
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if (fabs(det) < 1e-4) { |
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fprintf(stderr, "%s: cannot compute color mapping\n", |
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for (j = 0; j < 3; j++) |
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invmat[i][j] /= det; |
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for (i = 0; i < 3; i++) { |
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for (j = 0; j < 3; j++) |
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colv[j] = colval(cout[j],i); |
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if (n == 3) |
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for (j = 0; j < 3; j++) |
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colv[j] = colval(cout[j],i); |
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else |
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for (j = 0; j < 3; j++) { |
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colv[j] = 0.; |
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for (k = 0; k < n; k++) |
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colv[j] += colval(cout[k],i) * |
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colval(cin[k],j); |
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} |
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mx3d_transform(colv, invmat, rowv); |
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for (j = 0; j < 3; j++) |
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solmat[i][j] = rowv[j]; |
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} |
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} |
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#else |
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compsoln(cin, cout, n) /* solve 3xN system (N > 3) */ |
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COLOR cin[], cout[]; |
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int n; |
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{ |
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double *au[NMBMOD], *v[3], vv[3][3], auv[NMBMOD][3], w[3]; |
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double b[NMBMOD]; |
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register int i, j; |
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|
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if (n > NMBMOD) { |
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fprintf(stderr, "%s: inconsistent code!\n", progname); |
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exit(1); |
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} |
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for (i = 0; i < n; i++) /* assign rectangular matrix A */ |
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for (j = 0; j < 3; j++) |
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auv[i][j] = colval(cin[i],j); |
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/* svdcmp indexing requires pointer offsets */ |
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for (j = 0; j < 3; j++) |
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v[j] = vv[j] - 1; |
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for (i = 0; i < n; i++) |
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au[i] = auv[i] - 1; |
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/* compute singular value decomposition */ |
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fprintf(stderr, "A:\n"); |
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for (i = 1; i <= n; i++) |
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fprintf(stderr, "%g %g %g\n", (au-1)[i][1], (au-1)[i][2], (au-1)[i][3]); |
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svdcmp(au-1, n, 3, w-1, v-1); |
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fprintf(stderr, "U:\n"); |
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for (i = 0; i < n; i++) |
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fprintf(stderr, "%g %g %g\n", auv[i][0], auv[i][1], auv[i][2]); |
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fprintf(stderr, "V:\n"); |
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for (i = 0; i < 3; i++) |
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fprintf(stderr, "%g %g %g\n", vv[i][0], vv[i][1], vv[i][2]); |
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fprintf(stderr, "W: %g %g %g\n", w[0], w[1], w[2]); |
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/* zero out small weights */ |
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for (j = 0; j < 3; j++) |
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if (w[j] < 1e-4) |
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w[j] = 0.; |
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/* back substitution for each row vector */ |
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for (j = 0; j < 3; j++) { |
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for (i = 0; i < n; i++) |
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b[i] = colval(cout[i],j); |
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svbksb(au-1, w-1, v-1, n, 3, b-1, solmat[j]-1); |
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} |
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} |
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#endif |
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cvtcolor(cout, cin) /* convert color according to our mapping */ |
