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#include "resolu.h" |
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#include "pmap.h" |
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|
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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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|
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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 3 /* Number of MacBeth moderate colors */ |
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short mbmod[NMBMOD] = {1,3,2}; |
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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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|
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#define NMBMOD 16 /* 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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PurplishBlue,ModerateRed,YellowGreen,OrangeYellow, |
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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,Purple |
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}; |
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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 picRGB[24]; /* picture colors */ |
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|
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double bramp[NMBNEU][2]; /* brightness ramp */ |
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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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} |
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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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init() /* initialize */ |
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{ |
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double quad[4][2]; |
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COLOR ctmp; |
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double d; |
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int i; |
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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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fprintf(stderr, "%s: bad chart boundaries\n", progname); |
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exit(1); |
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} |
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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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ctmp[1] = mbxyY[i][2]; |
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ctmp[2] = (1. - mbxyY[i][0] - mbxyY[i][1]) * d; |
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cie_rgb(mbRGB[i], ctmp); |
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} |
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} |
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} |
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|
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double |
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bresp(x) /* piecewise linear interpolation of brightness */ |
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double x; |
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bresp(y, x) /* piecewise linear interpolation of primaries */ |
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COLOR y, x; |
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{ |
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register int n = NMBNEU; |
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double cv[3]; |
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register int i, n; |
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|
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while (n > 0 && x < bramp[--n][0]) |
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; |
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return( ((bramp[n+1][0] - x)*bramp[n][1] + |
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(x - bramp[n][0])*bramp[n+1][1]) / |
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(bramp[n+1][0] - bramp[n][0]) ); |
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> |
for (i = 0; i < 3; i++) { |
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for (n = 0; n < NMBNEU-2; n++) |
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if (colval(x,i) < colval(bramp[n+1][0],i)) |
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break; |
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cv[i] = ((colval(bramp[n+1][0],i) - colval(x,i)) * |
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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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if (cv[i] < 0.) cv[i] = 0.; |
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} |
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setcolor(y, cv[0], cv[1], cv[2]); |
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} |
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|
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putmapping() /* compute and print mapping for pcomb -f */ |
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compute() /* compute color mapping */ |
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{ |
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< |
float clrin[NMBMOD][3], clrout[NMBMOD][3]; |
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register int i, j; |
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> |
COLOR clrin[NMBMOD], clrout[NMBMOD]; |
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COLOR ctmp; |
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> |
double d; |
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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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ctmp[1] = mbxyY[i][2]; |
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ctmp[2] = (1. - mbxyY[i][0] - mbxyY[i][1]) * d; |
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> |
cie_rgb(mbRGB[i], ctmp); |
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> |
} |
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/* compute piecewise luminance curve */ |
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for (i = 0; i < NMBNEU; i++) { |
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bramp[i][0] = bright(picRGB[mbneu[i]]); |
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bramp[i][1] = bright(mbRGB[mbneu[i]]); |
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> |
copycolor(bramp[i][0], picRGB[mbneu[i]]); |
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copycolor(bramp[i][1], mbRGB[mbneu[i]]); |
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} |
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/* compute color matrix */ |
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for (i = 0; i < NMBMOD; i++) |
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for (j = 0; j < 3; j++) { |
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clrin[i][j] = bresp(picRGB[mbmod[i]][j]); |
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clrout[i][j] = mbRGB[mbmod[i]][j]; |
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} |
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> |
for (i = 0; i < NMBMOD; i++) { |
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> |
bresp(clrin[i], picRGB[mbmod[i]]); |
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copycolor(clrout[i], mbRGB[mbmod[i]]); |
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} |
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compsoln(clrin, clrout, NMBMOD); |
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} |
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|
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|
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putmapping() /* put out color mapping for pcomb -f */ |
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{ |
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static char cchar[3] = {'r', 'g', 'b'}; |
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register int i, j; |
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/* print brightness mapping */ |
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< |
printf("xval(i) : select(i, 0"); |
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< |
for (i = 0; i < NMBNEU; i++) |
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< |
printf(", %g", bramp[i][0]); |
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< |
printf(");\n"); |
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< |
printf("yval(i) : select(i, 0"); |
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< |
for (i = 0; i < NMBNEU; i++) |
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< |
printf(", %g", bramp[i][1]); |
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< |
printf(");\n"); |
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printf("ifind(x,f,n) : if(1.5-n, 1, if(x-f(n), n, ifind(x,f,n-1)));\n"); |
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< |
printf("binterp(i,x) : ((xval(i+1)-x)*yval(i) + (x-xval(i))*yval(i+1))/\n"); |
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< |
printf("\t\t(xval(i+1) - xval(i));\n"); |
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< |
printf("bresp(x) : binterp(ifind(x,xval,xval(0)-1), x);\n"); |
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< |
printf("nred = bresp(ri(1));\n"); |
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< |
printf("ngrn = bresp(gi(1));\n"); |
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< |
printf("nblu = bresp(bi(1));\n"); |
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> |
for (j = 0; j < 3; j++) { |
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> |
printf("%cxa(i) : select(i", cchar[j]); |
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> |
for (i = 0; i < NMBNEU; i++) |
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> |
printf(",%g", colval(bramp[i][0],j)); |
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> |
printf(");\n"); |
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> |
printf("%cya(i) : select(i", cchar[j]); |
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> |
for (i = 0; i < NMBNEU; i++) |
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> |
printf(",%g", colval(bramp[i][1],j)); |
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> |
printf(");\n"); |
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> |
printf("%c = %ci(1);\n", cchar[j], cchar[j]); |
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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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> |
cchar[j], NMBNEU-1.5, NMBNEU-1, cchar[j], |
| 334 |
> |
cchar[j], cchar[j]); |
| 335 |
> |
printf("%cndx = %cfi(1);\n", cchar[j], cchar[j]); |
| 336 |
> |
printf("%cn = ((%cxa(%cndx+1)-%c)*%cya(%cndx) + ", |
| 337 |
> |
cchar[j], cchar[j], cchar[j], |
| 338 |
> |
cchar[j], cchar[j], cchar[j]); |
| 339 |
> |
printf("(%c-%cxa(%cndx))*%cya(%cndx+1)) /\n", |
| 340 |
> |
cchar[j], cchar[j], cchar[j], |
| 341 |
> |
cchar[j], cchar[j]); |
| 342 |
> |
printf("\t\t(%cxa(%cndx+1) - %cxa(%cndx)) ;\n", |
| 343 |
> |
cchar[j], cchar[j], cchar[j], cchar[j]); |
| 344 |
> |
} |
| 345 |
|
/* print color mapping */ |
| 346 |
< |
printf("ro = %g*nred + %g*ngrn + %g*nblu\n", |
| 347 |
< |
solmat[0][0], solmat[1][0], solmat[2][0]); |
| 348 |
< |
printf("go = %g*nred + %g*ngrn + %g*nblu\n", |
| 349 |
< |
solmat[0][1], solmat[1][1], solmat[2][1]); |
| 350 |
< |
printf("bo = %g*nred + %g*ngrn + %g*nblu\n", |
| 351 |
< |
solmat[0][2], solmat[1][2], solmat[2][2]); |
| 346 |
> |
printf("ro = %g*rn + %g*gn + %g*bn ;\n", |
| 347 |
> |
solmat[0][0], solmat[0][1], solmat[0][2]); |
| 348 |
> |
printf("go = %g*rn + %g*gn + %g*bn ;\n", |
| 349 |
> |
solmat[1][0], solmat[1][1], solmat[1][2]); |
| 350 |
> |
printf("bo = %g*rn + %g*gn + %g*bn ;\n", |
| 351 |
> |
solmat[2][0], solmat[2][1], solmat[2][2]); |
| 352 |
|
} |
| 353 |
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|
| 354 |
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|
| 355 |
< |
compsoln(cin, cout, n) /* solve 3x3 system */ |
| 356 |
< |
float cin[][3], cout[][3]; |
| 355 |
> |
compsoln(cin, cout, n) /* solve 3xN system using least-squares */ |
| 356 |
> |
COLOR cin[], cout[]; |
| 357 |
|
int n; |
| 358 |
|
{ |
| 359 |
|
extern double mx3d_adjoint(), fabs(); |
| 360 |
|
double mat[3][3], invmat[3][3]; |
| 361 |
|
double det; |
| 362 |
|
double colv[3], rowv[3]; |
| 363 |
< |
register int i, j; |
| 363 |
> |
register int i, j, k; |
| 364 |
|
|
| 365 |
< |
if (n != 3) { |
| 365 |
> |
if (n < 3 | n > NMBMOD) { |
| 366 |
|
fprintf(stderr, "%s: inconsistent code!\n", progname); |
| 367 |
|
exit(1); |
| 368 |
|
} |
| 369 |
< |
for (i = 0; i < 3; i++) |
| 370 |
< |
for (j = 0; j < 3; j++) |
| 371 |
< |
mat[i][j] = cin[j][i]; |
| 369 |
> |
if (n == 3) |
| 370 |
> |
for (i = 0; i < 3; i++) |
| 371 |
> |
for (j = 0; j < 3; j++) |
| 372 |
> |
mat[i][j] = colval(cin[j],i); |
| 373 |
> |
else { /* compute A^t A */ |
| 374 |
> |
for (i = 0; i < 3; i++) |
| 375 |
> |
for (j = i; j < 3; j++) { |
| 376 |
> |
mat[i][j] = 0.; |
| 377 |
> |
for (k = 0; k < n; k++) |
| 378 |
> |
mat[i][j] += colval(cin[k],i) * |
| 379 |
> |
colval(cin[k],j); |
| 380 |
> |
} |
| 381 |
> |
for (i = 1; i < 3; i++) /* using symmetry */ |
| 382 |
> |
for (j = 0; j < i; j++) |
| 383 |
> |
mat[i][j] = mat[j][i]; |
| 384 |
> |
} |
| 385 |
|
det = mx3d_adjoint(mat, invmat); |
| 386 |
|
if (fabs(det) < 1e-4) { |
| 387 |
|
fprintf(stderr, "%s: cannot compute color mapping\n", |
| 395 |
|
for (j = 0; j < 3; j++) |
| 396 |
|
invmat[i][j] /= det; |
| 397 |
|
for (i = 0; i < 3; i++) { |
| 398 |
+ |
if (n == 3) |
| 399 |
+ |
for (j = 0; j < 3; j++) |
| 400 |
+ |
colv[j] = colval(cout[j],i); |
| 401 |
+ |
else |
| 402 |
+ |
for (j = 0; j < 3; j++) { |
| 403 |
+ |
colv[j] = 0.; |
| 404 |
+ |
for (k = 0; k < n; k++) |
| 405 |
+ |
colv[j] += colval(cout[k],i) * |
| 406 |
+ |
colval(cin[k],j); |
| 407 |
+ |
} |
| 408 |
+ |
mx3d_transform(colv, invmat, rowv); |
| 409 |
|
for (j = 0; j < 3; j++) |
| 410 |
< |
rowv[j] = cout[j][i]; |
| 329 |
< |
mx3d_transform(rowv, invmat, colv); |
| 330 |
< |
for (j = 0; j < 3; j++) |
| 331 |
< |
solmat[j][i] = colv[j]; |
| 410 |
> |
solmat[i][j] = rowv[j]; |
| 411 |
|
} |
| 412 |
|
} |
| 413 |
|
|
| 416 |
|
COLOR cout, cin; |
| 417 |
|
{ |
| 418 |
|
double r, g, b; |
| 340 |
– |
double r1, g1, b1; |
| 419 |
|
|
| 420 |
< |
r = bresp(colval(cin,RED)); |
| 421 |
< |
g = bresp(colval(cin,GRN)); |
| 422 |
< |
b = bresp(colval(cin,BLU)); |
| 423 |
< |
r1 = r*solmat[0][0] + g*solmat[1][0] + b*solmat[2][0]; |
| 424 |
< |
if (r1 < 0) r1 = 0; |
| 425 |
< |
g1 = r*solmat[0][1] + g*solmat[1][1] + b*solmat[2][1]; |
| 426 |
< |
if (g1 < 0) g1 = 0; |
| 427 |
< |
b1 = r*solmat[0][2] + g*solmat[1][2] + b*solmat[2][2]; |
| 428 |
< |
if (b1 < 0) b1 = 0; |
| 429 |
< |
setcolor(cout, r1, g1, b1); |
| 420 |
> |
bresp(cout, cin); |
| 421 |
> |
r = colval(cout,0)*solmat[0][0] + colval(cout,1)*solmat[0][1] |
| 422 |
> |
+ colval(cout,2)*solmat[0][2]; |
| 423 |
> |
if (r < 0) r = 0; |
| 424 |
> |
g = colval(cout,0)*solmat[1][0] + colval(cout,1)*solmat[1][1] |
| 425 |
> |
+ colval(cout,2)*solmat[1][2]; |
| 426 |
> |
if (g < 0) g = 0; |
| 427 |
> |
b = colval(cout,0)*solmat[2][0] + colval(cout,1)*solmat[2][1] |
| 428 |
> |
+ colval(cout,2)*solmat[2][2]; |
| 429 |
> |
if (b < 0) b = 0; |
| 430 |
> |
setcolor(cout, r, g, b); |
| 431 |
|
} |
| 432 |
|
|
| 433 |
|
|
| 452 |
|
exit(1); |
| 453 |
|
} |
| 454 |
|
/* finish debug header */ |
| 455 |
+ |
fputformat(COLRFMT, debugfp); |
| 456 |
|
putc('\n', debugfp); |
| 457 |
|
fprtresolu(xmax, ymax, debugfp); |
| 458 |
|
for (y = ymax-1; y >= 0; y--) { |
