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#ifndef lint |
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static const char RCSid[] = "$Id: pcond2.c,v 3.18 2015/08/21 05:48:28 greg Exp $"; |
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#endif |
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/* |
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* Input and output conditioning routines for pcond. |
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* Added white-balance adjustment 10/01 (GW). |
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*/ |
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|
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#include "pcond.h" |
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#include "warp3d.h" |
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|
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|
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RGBPRIMP inprims = stdprims; /* input primaries */ |
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COLORMAT inrgb2xyz; /* convert input RGB to XYZ */ |
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RGBPRIMP outprims = stdprims; /* output primaries */ |
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|
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double (*lumf)() = rgblum; /* input luminance function */ |
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double inpexp = 1.0; /* input exposure value */ |
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|
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char *mbcalfile = NULL; /* macbethcal mapping file */ |
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char *cwarpfile = NULL; /* color space warping file */ |
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|
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static struct mbc { |
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COLORMAT cmat; |
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float xa[3][6], ya[3][6]; |
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COLOR cmin, cmax; |
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} mbcond; /* macbethcal conditioning struct */ |
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|
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static WARP3D *cwarp; /* color warping structure */ |
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|
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static COLOR *scanbuf; /* scanline processing buffer */ |
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static int nread; /* number of scanlines processed */ |
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|
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static void sfscan(COLOR *sl, int len, double sf); |
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static void matscan(COLOR *sl, int len, COLORMAT mat); |
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static void mbscan(COLOR *sl, int len, struct mbc *mb); |
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static void cwscan(COLOR *sl, int len, WARP3D *wp); |
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static void getmbcalfile(char *fn, struct mbc *mb); |
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|
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|
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double |
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rgblum( /* compute (scotopic) luminance of RGB color */ |
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COLOR clr, |
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int scotopic |
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) |
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{ |
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if (scotopic) /* approximate */ |
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return( WHTSEFFICACY * (colval(clr,RED)*.062 + |
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colval(clr,GRN)*.608 + colval(clr,BLU)*.330) ); |
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return( WHTEFFICACY * (colval(clr,RED)*inrgb2xyz[1][0] + |
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colval(clr,GRN)*inrgb2xyz[1][1] + |
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colval(clr,BLU)*inrgb2xyz[1][2]) ); |
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} |
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|
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|
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double |
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cielum( /* compute (scotopic) luminance of CIE color */ |
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COLOR xyz, |
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int scotopic |
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) |
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{ |
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if (scotopic) /* approximate */ |
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return(colval(xyz,CIEY) * |
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(1.33*(1. + (colval(xyz,CIEY)+colval(xyz,CIEZ))/ |
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colval(xyz,CIEX)) - 1.68)); |
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return(colval(xyz,CIEY)); |
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} |
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|
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|
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COLOR * |
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nextscan(void) /* read and condition next scanline */ |
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{ |
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if (nread >= numscans(&inpres)) { |
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if (cwarpfile != NULL) |
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free3dw(cwarp); |
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free((void *)scanbuf); |
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return(scanbuf = NULL); |
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} |
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if (what2do&DO_ACUITY) |
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acuscan(scanbuf, nread); |
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else if (fread2scan(scanbuf, scanlen(&inpres), infp, |
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NCSAMP, WLPART) < 0) { |
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fprintf(stderr, "%s: %s: scanline read error\n", |
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progname, infn); |
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exit(1); |
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} |
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if (what2do&DO_VEIL) /* add veiling */ |
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addveil(scanbuf, nread); |
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if (what2do&DO_COLOR) /* scotopic color loss */ |
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scotscan(scanbuf, scanlen(&inpres)); |
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if (what2do&DO_LINEAR) /* map luminances */ |
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sfscan(scanbuf, scanlen(&inpres), scalef); |
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else |
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mapscan(scanbuf, scanlen(&inpres)); |
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if (mbcalfile != NULL) /* device color correction */ |
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mbscan(scanbuf, scanlen(&inpres), &mbcond); |
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else if (cwarpfile != NULL) /* device color space warp */ |
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cwscan(scanbuf, scanlen(&inpres), cwarp); |
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else if ((lumf == cielum) | (inprims != outprims)) |
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matscan(scanbuf, scanlen(&inpres), mbcond.cmat); |
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nread++; |
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return(scanbuf); |
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} |
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|
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|
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COLOR * |
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firstscan(void) /* return first processed scanline */ |
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{ |
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if (mbcalfile != NULL) /* load macbethcal file */ |
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getmbcalfile(mbcalfile, &mbcond); |
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else if (cwarpfile != NULL) { |
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if ((cwarp = load3dw(cwarpfile, NULL)) == NULL) |
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syserror(cwarpfile); |
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} else |
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if (lumf == rgblum) |
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comprgb2rgbWBmat(mbcond.cmat, inprims, outprims); |
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else |
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compxyz2rgbWBmat(mbcond.cmat, outprims); |
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if (what2do&DO_ACUITY) |
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initacuity(); |
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scanbuf = (COLOR *)malloc(scanlen(&inpres)*sizeof(COLOR)); |
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if (scanbuf == NULL) |
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syserror("malloc"); |
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nread = 0; |
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return(nextscan()); |
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} |
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|
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|
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static void |
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sfscan( /* apply scalefactor to scanline */ |
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COLOR *sl, |
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int len, |
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double sf |
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) |
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{ |
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while (len--) { |
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scalecolor(sl[0], sf); |
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sl++; |
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} |
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} |
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|
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|
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static double |
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greypoint( /* compute gamut mapping grey target */ |
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COLOR col |
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) |
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{ |
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COLOR gryc; |
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int i; |
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/* improves saturated color rendering */ |
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copycolor(gryc, col); |
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for (i = 3; i--; ) |
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if (gryc[i] > 1) |
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gryc[i] = 1; |
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else if (gryc[i] < 0) |
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gryc[i] = 0; |
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return(bright(gryc)); |
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} |
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|
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|
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static void |
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matscan( /* apply color matrix to scaline */ |
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COLOR *sl, |
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int len, |
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COLORMAT mat |
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) |
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{ |
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while (len--) { |
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colortrans(sl[0], mat, sl[0]); |
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clipgamut(sl[0], greypoint(sl[0]), CGAMUT, cblack, cwhite); |
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sl++; |
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} |
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} |
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|
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|
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static void |
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mbscan( /* apply macbethcal adj. to scaline */ |
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COLOR *sl, |
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int len, |
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struct mbc *mb |
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) |
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{ |
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double d; |
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int i, j; |
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|
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while (len--) { |
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colortrans(sl[0], mb->cmat, sl[0]); |
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clipgamut(sl[0], greypoint(sl[0]), CGAMUT, mb->cmin, mb->cmax); |
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for (i = 0; i < 3; i++) { |
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d = colval(sl[0],i); |
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for (j = 0; j < 4 && mb->xa[i][j+1] <= d; j++) |
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; |
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colval(sl[0],i) = ( (mb->xa[i][j+1] - d)*mb->ya[i][j] + |
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(d - mb->xa[i][j])*mb->ya[i][j+1] ) / |
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(mb->xa[i][j+1] - mb->xa[i][j]); |
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} |
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sl++; |
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} |
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} |
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|
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|
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static void |
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cwscan( /* apply color space warp to scaline */ |
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COLOR *sl, |
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int len, |
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WARP3D *wp |
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) |
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{ |
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int rval; |
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|
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while (len--) { |
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rval = warp3d(sl[0], sl[0], wp); |
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if (rval & W3ERROR) |
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syserror("warp3d"); |
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if (rval & W3BADMAP) { |
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fprintf(stderr, "%s: %s: bad color space map\n", |
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progname, cwarpfile); |
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exit(1); |
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} |
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clipgamut(sl[0], greypoint(sl[0]), CGAMUT, cblack, cwhite); |
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sl++; |
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} |
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} |
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|
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|
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static void |
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getmbcalfile( /* load macbethcal file */ |
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char *fn, |
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struct mbc *mb |
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) |
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{ |
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char buf[128]; |
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FILE *fp; |
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int inpflags = 0; |
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int i; |
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|
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if ((fp = fopen(fn, "r")) == NULL) |
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syserror(fn); |
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while (fgets(buf, sizeof(buf), fp) != NULL) { |
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if (!(inpflags & 01) && |
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sscanf(buf, |
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"rxa(i) : select(i,%f,%f,%f,%f,%f,%f)", |
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&mb->xa[0][0], &mb->xa[0][1], |
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&mb->xa[0][2], &mb->xa[0][3], |
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&mb->xa[0][4], &mb->xa[0][5] |
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) == 6) |
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inpflags |= 01; |
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else if (!(inpflags & 02) && |
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sscanf(buf, |
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"rya(i) : select(i,%f,%f,%f,%f,%f,%f)", |
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&mb->ya[0][0], &mb->ya[0][1], |
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&mb->ya[0][2], &mb->ya[0][3], |
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&mb->ya[0][4], &mb->ya[0][5] |
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) == 6) |
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inpflags |= 02; |
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else if (!(inpflags & 04) && |
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sscanf(buf, |
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"gxa(i) : select(i,%f,%f,%f,%f,%f,%f)", |
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&mb->xa[1][0], &mb->xa[1][1], |
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&mb->xa[1][2], &mb->xa[1][3], |
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&mb->xa[1][4], &mb->xa[1][5] |
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) == 6) |
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inpflags |= 04; |
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else if (!(inpflags & 010) && |
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sscanf(buf, |
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"gya(i) : select(i,%f,%f,%f,%f,%f,%f)", |
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&mb->ya[1][0], &mb->ya[1][1], |
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&mb->ya[1][2], &mb->ya[1][3], |
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&mb->ya[1][4], &mb->ya[1][5] |
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) == 6) |
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inpflags |= 010; |
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else if (!(inpflags & 020) && |
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sscanf(buf, |
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"bxa(i) : select(i,%f,%f,%f,%f,%f,%f)", |
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&mb->xa[2][0], &mb->xa[2][1], |
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&mb->xa[2][2], &mb->xa[2][3], |
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&mb->xa[2][4], &mb->xa[2][5] |
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) == 6) |
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inpflags |= 020; |
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else if (!(inpflags & 040) && |
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sscanf(buf, |
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"bya(i) : select(i,%f,%f,%f,%f,%f,%f)", |
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&mb->ya[2][0], &mb->ya[2][1], |
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&mb->ya[2][2], &mb->ya[2][3], |
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&mb->ya[2][4], &mb->ya[2][5] |
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) == 6) |
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inpflags |= 040; |
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else if (!(inpflags & 0100) && |
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sscanf(buf, |
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"ro = %f*rn + %f*gn + %f*bn", |
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&mb->cmat[0][0], &mb->cmat[0][1], |
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&mb->cmat[0][2]) == 3) |
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inpflags |= 0100; |
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else if (!(inpflags & 0200) && |
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sscanf(buf, |
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"go = %f*rn + %f*gn + %f*bn", |
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&mb->cmat[1][0], &mb->cmat[1][1], |
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&mb->cmat[1][2]) == 3) |
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inpflags |= 0200; |
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else if (!(inpflags & 0400) && |
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sscanf(buf, |
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"bo = %f*rn + %f*gn + %f*bn", |
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&mb->cmat[2][0], &mb->cmat[2][1], |
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&mb->cmat[2][2]) == 3) |
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inpflags |= 0400; |
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} |
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if (inpflags != 0777) { |
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fprintf(stderr, |
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"%s: cannot grok macbethcal file \"%s\" (inpflags==0%o)\n", |
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progname, fn, inpflags); |
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exit(1); |
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} |
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fclose(fp); |
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/* compute gamut */ |
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for (i = 0; i < 3; i++) { |
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colval(mb->cmin,i) = mb->xa[i][0] - |
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mb->ya[i][0] * |
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(mb->xa[i][1]-mb->xa[i][0]) / |
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(mb->ya[i][1]-mb->ya[i][0]); |
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colval(mb->cmax,i) = mb->xa[i][4] + |
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(1.-mb->ya[i][4]) * |
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(mb->xa[i][5] - mb->xa[i][4]) / |
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(mb->ya[i][5] - mb->ya[i][4]); |
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} |
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} |
