| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id$"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* Input and output conditioning routines for pcond. |
| 6 |
* Added white-balance adjustment 10/01 (GW). |
| 7 |
*/ |
| 8 |
|
| 9 |
#include "pcond.h" |
| 10 |
#include "warp3d.h" |
| 11 |
|
| 12 |
|
| 13 |
RGBPRIMP inprims = stdprims; /* input primaries */ |
| 14 |
COLORMAT inrgb2xyz; /* convert input RGB to XYZ */ |
| 15 |
RGBPRIMP outprims = stdprims; /* output primaries */ |
| 16 |
|
| 17 |
double (*lumf)() = rgblum; /* input luminance function */ |
| 18 |
double inpexp = 1.0; /* input exposure value */ |
| 19 |
|
| 20 |
char *mbcalfile = NULL; /* macbethcal mapping file */ |
| 21 |
char *cwarpfile = NULL; /* color space warping file */ |
| 22 |
|
| 23 |
static struct mbc { |
| 24 |
COLORMAT cmat; |
| 25 |
float xa[3][6], ya[3][6]; |
| 26 |
COLOR cmin, cmax; |
| 27 |
} mbcond; /* macbethcal conditioning struct */ |
| 28 |
|
| 29 |
static WARP3D *cwarp; /* color warping structure */ |
| 30 |
|
| 31 |
static COLOR *scanbuf; /* scanline processing buffer */ |
| 32 |
static int nread; /* number of scanlines processed */ |
| 33 |
|
| 34 |
|
| 35 |
double |
| 36 |
rgblum(clr, scotopic) /* compute (scotopic) luminance of RGB color */ |
| 37 |
COLOR clr; |
| 38 |
int scotopic; |
| 39 |
{ |
| 40 |
if (scotopic) /* approximate */ |
| 41 |
return( WHTSEFFICACY * (colval(clr,RED)*.062 + |
| 42 |
colval(clr,GRN)*.608 + colval(clr,BLU)*.330) ); |
| 43 |
return( WHTEFFICACY * (colval(clr,RED)*inrgb2xyz[1][0] + |
| 44 |
colval(clr,GRN)*inrgb2xyz[1][1] + |
| 45 |
colval(clr,BLU)*inrgb2xyz[1][2]) ); |
| 46 |
} |
| 47 |
|
| 48 |
|
| 49 |
double |
| 50 |
cielum(xyz, scotopic) /* compute (scotopic) luminance of CIE color */ |
| 51 |
COLOR xyz; |
| 52 |
int scotopic; |
| 53 |
{ |
| 54 |
if (scotopic) /* approximate */ |
| 55 |
return(colval(xyz,CIEY) * |
| 56 |
(1.33*(1. + (colval(xyz,CIEY)+colval(xyz,CIEZ))/ |
| 57 |
colval(xyz,CIEX)) - 1.68)); |
| 58 |
return(colval(xyz,CIEY)); |
| 59 |
} |
| 60 |
|
| 61 |
|
| 62 |
COLOR * |
| 63 |
nextscan() /* read and condition next scanline */ |
| 64 |
{ |
| 65 |
if (nread >= numscans(&inpres)) { |
| 66 |
if (cwarpfile != NULL) |
| 67 |
free3dw(cwarp); |
| 68 |
free((void *)scanbuf); |
| 69 |
return(scanbuf = NULL); |
| 70 |
} |
| 71 |
if (what2do&DO_ACUITY) |
| 72 |
acuscan(scanbuf, nread); |
| 73 |
else if (freadscan(scanbuf, scanlen(&inpres), infp) < 0) { |
| 74 |
fprintf(stderr, "%s: %s: scanline read error\n", |
| 75 |
progname, infn); |
| 76 |
exit(1); |
| 77 |
} |
| 78 |
if (what2do&DO_VEIL) /* add veiling */ |
| 79 |
addveil(scanbuf, nread); |
| 80 |
if (what2do&DO_COLOR) /* scotopic color loss */ |
| 81 |
scotscan(scanbuf, scanlen(&inpres)); |
| 82 |
if (what2do&DO_LINEAR) /* map luminances */ |
| 83 |
sfscan(scanbuf, scanlen(&inpres), scalef); |
| 84 |
else |
| 85 |
mapscan(scanbuf, scanlen(&inpres)); |
| 86 |
if (mbcalfile != NULL) /* device color correction */ |
| 87 |
mbscan(scanbuf, scanlen(&inpres), &mbcond); |
| 88 |
else if (cwarpfile != NULL) /* device color space warp */ |
| 89 |
cwscan(scanbuf, scanlen(&inpres), cwarp); |
| 90 |
else if (lumf == cielum | inprims != outprims) |
| 91 |
matscan(scanbuf, scanlen(&inpres), mbcond.cmat); |
| 92 |
nread++; |
| 93 |
return(scanbuf); |
| 94 |
} |
| 95 |
|
| 96 |
|
| 97 |
COLOR * |
| 98 |
firstscan() /* return first processed scanline */ |
| 99 |
{ |
| 100 |
if (mbcalfile != NULL) /* load macbethcal file */ |
| 101 |
getmbcalfile(mbcalfile, &mbcond); |
| 102 |
else if (cwarpfile != NULL) { |
| 103 |
if ((cwarp = load3dw(cwarpfile, NULL)) == NULL) |
| 104 |
syserror(cwarpfile); |
| 105 |
} else |
| 106 |
if (lumf == rgblum) |
| 107 |
comprgb2rgbWBmat(mbcond.cmat, inprims, outprims); |
| 108 |
else |
| 109 |
compxyz2rgbWBmat(mbcond.cmat, outprims); |
| 110 |
if (what2do&DO_ACUITY) |
| 111 |
initacuity(); |
| 112 |
scanbuf = (COLOR *)malloc(scanlen(&inpres)*sizeof(COLOR)); |
| 113 |
if (scanbuf == NULL) |
| 114 |
syserror("malloc"); |
| 115 |
nread = 0; |
| 116 |
return(nextscan()); |
| 117 |
} |
| 118 |
|
| 119 |
|
| 120 |
sfscan(sl, len, sf) /* apply scalefactor to scanline */ |
| 121 |
register COLOR *sl; |
| 122 |
int len; |
| 123 |
double sf; |
| 124 |
{ |
| 125 |
while (len--) { |
| 126 |
scalecolor(sl[0], sf); |
| 127 |
sl++; |
| 128 |
} |
| 129 |
} |
| 130 |
|
| 131 |
|
| 132 |
matscan(sl, len, mat) /* apply color matrix to scaline */ |
| 133 |
register COLOR *sl; |
| 134 |
int len; |
| 135 |
COLORMAT mat; |
| 136 |
{ |
| 137 |
while (len--) { |
| 138 |
colortrans(sl[0], mat, sl[0]); |
| 139 |
clipgamut(sl[0], bright(sl[0]), CGAMUT, cblack, cwhite); |
| 140 |
sl++; |
| 141 |
} |
| 142 |
} |
| 143 |
|
| 144 |
|
| 145 |
mbscan(sl, len, mb) /* apply macbethcal adj. to scaline */ |
| 146 |
COLOR *sl; |
| 147 |
int len; |
| 148 |
register struct mbc *mb; |
| 149 |
{ |
| 150 |
double d; |
| 151 |
register int i, j; |
| 152 |
|
| 153 |
while (len--) { |
| 154 |
colortrans(sl[0], mb->cmat, sl[0]); |
| 155 |
clipgamut(sl[0], bright(sl[0]), CGAMUT, mb->cmin, mb->cmax); |
| 156 |
for (i = 0; i < 3; i++) { |
| 157 |
d = colval(sl[0],i); |
| 158 |
for (j = 0; j < 4 && mb->xa[i][j+1] <= d; j++) |
| 159 |
; |
| 160 |
colval(sl[0],i) = ( (mb->xa[i][j+1] - d)*mb->ya[i][j] + |
| 161 |
(d - mb->xa[i][j])*mb->ya[i][j+1] ) / |
| 162 |
(mb->xa[i][j+1] - mb->xa[i][j]); |
| 163 |
} |
| 164 |
sl++; |
| 165 |
} |
| 166 |
} |
| 167 |
|
| 168 |
|
| 169 |
cwscan(sl, len, wp) /* apply color space warp to scaline */ |
| 170 |
COLOR *sl; |
| 171 |
int len; |
| 172 |
WARP3D *wp; |
| 173 |
{ |
| 174 |
int rval; |
| 175 |
|
| 176 |
while (len--) { |
| 177 |
rval = warp3d(sl[0], sl[0], wp); |
| 178 |
if (rval & W3ERROR) |
| 179 |
syserror("warp3d"); |
| 180 |
if (rval & W3BADMAP) { |
| 181 |
fprintf(stderr, "%s: %s: bad color space map\n", |
| 182 |
progname, cwarpfile); |
| 183 |
exit(1); |
| 184 |
} |
| 185 |
clipgamut(sl[0], bright(sl[0]), CGAMUT, cblack, cwhite); |
| 186 |
sl++; |
| 187 |
} |
| 188 |
} |
| 189 |
|
| 190 |
|
| 191 |
getmbcalfile(fn, mb) /* load macbethcal file */ |
| 192 |
char *fn; |
| 193 |
register struct mbc *mb; |
| 194 |
{ |
| 195 |
extern char *fgets(); |
| 196 |
char buf[128]; |
| 197 |
FILE *fp; |
| 198 |
int inpflags = 0; |
| 199 |
register int i; |
| 200 |
|
| 201 |
if ((fp = fopen(fn, "r")) == NULL) |
| 202 |
syserror(fn); |
| 203 |
while (fgets(buf, sizeof(buf), fp) != NULL) { |
| 204 |
if (!(inpflags & 01) && |
| 205 |
sscanf(buf, |
| 206 |
"rxa(i) : select(i,%f,%f,%f,%f,%f,%f)", |
| 207 |
&mb->xa[0][0], &mb->xa[0][1], |
| 208 |
&mb->xa[0][2], &mb->xa[0][3], |
| 209 |
&mb->xa[0][4], &mb->xa[0][5] |
| 210 |
) == 6) |
| 211 |
inpflags |= 01; |
| 212 |
else if (!(inpflags & 02) && |
| 213 |
sscanf(buf, |
| 214 |
"rya(i) : select(i,%f,%f,%f,%f,%f,%f)", |
| 215 |
&mb->ya[0][0], &mb->ya[0][1], |
| 216 |
&mb->ya[0][2], &mb->ya[0][3], |
| 217 |
&mb->ya[0][4], &mb->ya[0][5] |
| 218 |
) == 6) |
| 219 |
inpflags |= 02; |
| 220 |
else if (!(inpflags & 04) && |
| 221 |
sscanf(buf, |
| 222 |
"gxa(i) : select(i,%f,%f,%f,%f,%f,%f)", |
| 223 |
&mb->xa[1][0], &mb->xa[1][1], |
| 224 |
&mb->xa[1][2], &mb->xa[1][3], |
| 225 |
&mb->xa[1][4], &mb->xa[1][5] |
| 226 |
) == 6) |
| 227 |
inpflags |= 04; |
| 228 |
else if (!(inpflags & 010) && |
| 229 |
sscanf(buf, |
| 230 |
"gya(i) : select(i,%f,%f,%f,%f,%f,%f)", |
| 231 |
&mb->ya[1][0], &mb->ya[1][1], |
| 232 |
&mb->ya[1][2], &mb->ya[1][3], |
| 233 |
&mb->ya[1][4], &mb->ya[1][5] |
| 234 |
) == 6) |
| 235 |
inpflags |= 010; |
| 236 |
else if (!(inpflags & 020) && |
| 237 |
sscanf(buf, |
| 238 |
"bxa(i) : select(i,%f,%f,%f,%f,%f,%f)", |
| 239 |
&mb->xa[2][0], &mb->xa[2][1], |
| 240 |
&mb->xa[2][2], &mb->xa[2][3], |
| 241 |
&mb->xa[2][4], &mb->xa[2][5] |
| 242 |
) == 6) |
| 243 |
inpflags |= 020; |
| 244 |
else if (!(inpflags & 040) && |
| 245 |
sscanf(buf, |
| 246 |
"bya(i) : select(i,%f,%f,%f,%f,%f,%f)", |
| 247 |
&mb->ya[2][0], &mb->ya[2][1], |
| 248 |
&mb->ya[2][2], &mb->ya[2][3], |
| 249 |
&mb->ya[2][4], &mb->ya[2][5] |
| 250 |
) == 6) |
| 251 |
inpflags |= 040; |
| 252 |
else if (!(inpflags & 0100) && |
| 253 |
sscanf(buf, |
| 254 |
"ro = %f*rn + %f*gn + %f*bn", |
| 255 |
&mb->cmat[0][0], &mb->cmat[0][1], |
| 256 |
&mb->cmat[0][2]) == 3) |
| 257 |
inpflags |= 0100; |
| 258 |
else if (!(inpflags & 0200) && |
| 259 |
sscanf(buf, |
| 260 |
"go = %f*rn + %f*gn + %f*bn", |
| 261 |
&mb->cmat[1][0], &mb->cmat[1][1], |
| 262 |
&mb->cmat[1][2]) == 3) |
| 263 |
inpflags |= 0200; |
| 264 |
else if (!(inpflags & 0400) && |
| 265 |
sscanf(buf, |
| 266 |
"bo = %f*rn + %f*gn + %f*bn", |
| 267 |
&mb->cmat[2][0], &mb->cmat[2][1], |
| 268 |
&mb->cmat[2][2]) == 3) |
| 269 |
inpflags |= 0400; |
| 270 |
} |
| 271 |
if (inpflags != 0777) { |
| 272 |
fprintf(stderr, |
| 273 |
"%s: cannot grok macbethcal file \"%s\" (inpflags==0%o)\n", |
| 274 |
progname, fn, inpflags); |
| 275 |
exit(1); |
| 276 |
} |
| 277 |
fclose(fp); |
| 278 |
/* compute gamut */ |
| 279 |
for (i = 0; i < 3; i++) { |
| 280 |
colval(mb->cmin,i) = mb->xa[i][0] - |
| 281 |
mb->ya[i][0] * |
| 282 |
(mb->xa[i][1]-mb->xa[i][0]) / |
| 283 |
(mb->ya[i][1]-mb->ya[i][0]); |
| 284 |
colval(mb->cmax,i) = mb->xa[i][4] + |
| 285 |
(1.-mb->ya[i][4]) * |
| 286 |
(mb->xa[i][5] - mb->xa[i][4]) / |
| 287 |
(mb->ya[i][5] - mb->ya[i][4]); |
| 288 |
} |
| 289 |
} |
