| 1 |
#ifndef lint
|
| 2 |
static const char RCSid[] = "$Id: pcond2.c,v 3.13 2004/11/08 15:50:59 greg Exp $";
|
| 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 |
static void sfscan(COLOR *sl, int len, double sf);
|
| 35 |
static void matscan(COLOR *sl, int len, COLORMAT mat);
|
| 36 |
static void mbscan(COLOR *sl, int len, struct mbc *mb);
|
| 37 |
static void cwscan(COLOR *sl, int len, WARP3D *wp);
|
| 38 |
static void getmbcalfile(char *fn, struct mbc *mb);
|
| 39 |
|
| 40 |
|
| 41 |
extern double
|
| 42 |
rgblum( /* compute (scotopic) luminance of RGB color */
|
| 43 |
COLOR clr,
|
| 44 |
int scotopic
|
| 45 |
)
|
| 46 |
{
|
| 47 |
if (scotopic) /* approximate */
|
| 48 |
return( WHTSEFFICACY * (colval(clr,RED)*.062 +
|
| 49 |
colval(clr,GRN)*.608 + colval(clr,BLU)*.330) );
|
| 50 |
return( WHTEFFICACY * (colval(clr,RED)*inrgb2xyz[1][0] +
|
| 51 |
colval(clr,GRN)*inrgb2xyz[1][1] +
|
| 52 |
colval(clr,BLU)*inrgb2xyz[1][2]) );
|
| 53 |
}
|
| 54 |
|
| 55 |
|
| 56 |
extern double
|
| 57 |
cielum( /* compute (scotopic) luminance of CIE color */
|
| 58 |
COLOR xyz,
|
| 59 |
int scotopic
|
| 60 |
)
|
| 61 |
{
|
| 62 |
if (scotopic) /* approximate */
|
| 63 |
return(colval(xyz,CIEY) *
|
| 64 |
(1.33*(1. + (colval(xyz,CIEY)+colval(xyz,CIEZ))/
|
| 65 |
colval(xyz,CIEX)) - 1.68));
|
| 66 |
return(colval(xyz,CIEY));
|
| 67 |
}
|
| 68 |
|
| 69 |
|
| 70 |
extern COLOR *
|
| 71 |
nextscan(void) /* read and condition next scanline */
|
| 72 |
{
|
| 73 |
if (nread >= numscans(&inpres)) {
|
| 74 |
if (cwarpfile != NULL)
|
| 75 |
free3dw(cwarp);
|
| 76 |
free((void *)scanbuf);
|
| 77 |
return(scanbuf = NULL);
|
| 78 |
}
|
| 79 |
if (what2do&DO_ACUITY)
|
| 80 |
acuscan(scanbuf, nread);
|
| 81 |
else if (freadscan(scanbuf, scanlen(&inpres), infp) < 0) {
|
| 82 |
fprintf(stderr, "%s: %s: scanline read error\n",
|
| 83 |
progname, infn);
|
| 84 |
exit(1);
|
| 85 |
}
|
| 86 |
if (what2do&DO_VEIL) /* add veiling */
|
| 87 |
addveil(scanbuf, nread);
|
| 88 |
if (what2do&DO_COLOR) /* scotopic color loss */
|
| 89 |
scotscan(scanbuf, scanlen(&inpres));
|
| 90 |
if (what2do&DO_LINEAR) /* map luminances */
|
| 91 |
sfscan(scanbuf, scanlen(&inpres), scalef);
|
| 92 |
else
|
| 93 |
mapscan(scanbuf, scanlen(&inpres));
|
| 94 |
if (mbcalfile != NULL) /* device color correction */
|
| 95 |
mbscan(scanbuf, scanlen(&inpres), &mbcond);
|
| 96 |
else if (cwarpfile != NULL) /* device color space warp */
|
| 97 |
cwscan(scanbuf, scanlen(&inpres), cwarp);
|
| 98 |
else if ((lumf == cielum) | (inprims != outprims))
|
| 99 |
matscan(scanbuf, scanlen(&inpres), mbcond.cmat);
|
| 100 |
nread++;
|
| 101 |
return(scanbuf);
|
| 102 |
}
|
| 103 |
|
| 104 |
|
| 105 |
extern COLOR *
|
| 106 |
firstscan(void) /* return first processed scanline */
|
| 107 |
{
|
| 108 |
if (mbcalfile != NULL) /* load macbethcal file */
|
| 109 |
getmbcalfile(mbcalfile, &mbcond);
|
| 110 |
else if (cwarpfile != NULL) {
|
| 111 |
if ((cwarp = load3dw(cwarpfile, NULL)) == NULL)
|
| 112 |
syserror(cwarpfile);
|
| 113 |
} else
|
| 114 |
if (lumf == rgblum)
|
| 115 |
comprgb2rgbWBmat(mbcond.cmat, inprims, outprims);
|
| 116 |
else
|
| 117 |
compxyz2rgbWBmat(mbcond.cmat, outprims);
|
| 118 |
if (what2do&DO_ACUITY)
|
| 119 |
initacuity();
|
| 120 |
scanbuf = (COLOR *)malloc(scanlen(&inpres)*sizeof(COLOR));
|
| 121 |
if (scanbuf == NULL)
|
| 122 |
syserror("malloc");
|
| 123 |
nread = 0;
|
| 124 |
return(nextscan());
|
| 125 |
}
|
| 126 |
|
| 127 |
|
| 128 |
static void
|
| 129 |
sfscan( /* apply scalefactor to scanline */
|
| 130 |
register COLOR *sl,
|
| 131 |
int len,
|
| 132 |
double sf
|
| 133 |
)
|
| 134 |
{
|
| 135 |
while (len--) {
|
| 136 |
scalecolor(sl[0], sf);
|
| 137 |
sl++;
|
| 138 |
}
|
| 139 |
}
|
| 140 |
|
| 141 |
|
| 142 |
static void
|
| 143 |
matscan( /* apply color matrix to scaline */
|
| 144 |
register COLOR *sl,
|
| 145 |
int len,
|
| 146 |
COLORMAT mat
|
| 147 |
)
|
| 148 |
{
|
| 149 |
while (len--) {
|
| 150 |
colortrans(sl[0], mat, sl[0]);
|
| 151 |
clipgamut(sl[0], bright(sl[0]), CGAMUT, cblack, cwhite);
|
| 152 |
sl++;
|
| 153 |
}
|
| 154 |
}
|
| 155 |
|
| 156 |
|
| 157 |
static void
|
| 158 |
mbscan( /* apply macbethcal adj. to scaline */
|
| 159 |
COLOR *sl,
|
| 160 |
int len,
|
| 161 |
register struct mbc *mb
|
| 162 |
)
|
| 163 |
{
|
| 164 |
double d;
|
| 165 |
register int i, j;
|
| 166 |
|
| 167 |
while (len--) {
|
| 168 |
colortrans(sl[0], mb->cmat, sl[0]);
|
| 169 |
clipgamut(sl[0], bright(sl[0]), CGAMUT, mb->cmin, mb->cmax);
|
| 170 |
for (i = 0; i < 3; i++) {
|
| 171 |
d = colval(sl[0],i);
|
| 172 |
for (j = 0; j < 4 && mb->xa[i][j+1] <= d; j++)
|
| 173 |
;
|
| 174 |
colval(sl[0],i) = ( (mb->xa[i][j+1] - d)*mb->ya[i][j] +
|
| 175 |
(d - mb->xa[i][j])*mb->ya[i][j+1] ) /
|
| 176 |
(mb->xa[i][j+1] - mb->xa[i][j]);
|
| 177 |
}
|
| 178 |
sl++;
|
| 179 |
}
|
| 180 |
}
|
| 181 |
|
| 182 |
|
| 183 |
static void
|
| 184 |
cwscan( /* apply color space warp to scaline */
|
| 185 |
COLOR *sl,
|
| 186 |
int len,
|
| 187 |
WARP3D *wp
|
| 188 |
)
|
| 189 |
{
|
| 190 |
int rval;
|
| 191 |
|
| 192 |
while (len--) {
|
| 193 |
rval = warp3d(sl[0], sl[0], wp);
|
| 194 |
if (rval & W3ERROR)
|
| 195 |
syserror("warp3d");
|
| 196 |
if (rval & W3BADMAP) {
|
| 197 |
fprintf(stderr, "%s: %s: bad color space map\n",
|
| 198 |
progname, cwarpfile);
|
| 199 |
exit(1);
|
| 200 |
}
|
| 201 |
clipgamut(sl[0], bright(sl[0]), CGAMUT, cblack, cwhite);
|
| 202 |
sl++;
|
| 203 |
}
|
| 204 |
}
|
| 205 |
|
| 206 |
|
| 207 |
static void
|
| 208 |
getmbcalfile( /* load macbethcal file */
|
| 209 |
char *fn,
|
| 210 |
register struct mbc *mb
|
| 211 |
)
|
| 212 |
{
|
| 213 |
char buf[128];
|
| 214 |
FILE *fp;
|
| 215 |
int inpflags = 0;
|
| 216 |
register int i;
|
| 217 |
|
| 218 |
if ((fp = fopen(fn, "r")) == NULL)
|
| 219 |
syserror(fn);
|
| 220 |
while (fgets(buf, sizeof(buf), fp) != NULL) {
|
| 221 |
if (!(inpflags & 01) &&
|
| 222 |
sscanf(buf,
|
| 223 |
"rxa(i) : select(i,%f,%f,%f,%f,%f,%f)",
|
| 224 |
&mb->xa[0][0], &mb->xa[0][1],
|
| 225 |
&mb->xa[0][2], &mb->xa[0][3],
|
| 226 |
&mb->xa[0][4], &mb->xa[0][5]
|
| 227 |
) == 6)
|
| 228 |
inpflags |= 01;
|
| 229 |
else if (!(inpflags & 02) &&
|
| 230 |
sscanf(buf,
|
| 231 |
"rya(i) : select(i,%f,%f,%f,%f,%f,%f)",
|
| 232 |
&mb->ya[0][0], &mb->ya[0][1],
|
| 233 |
&mb->ya[0][2], &mb->ya[0][3],
|
| 234 |
&mb->ya[0][4], &mb->ya[0][5]
|
| 235 |
) == 6)
|
| 236 |
inpflags |= 02;
|
| 237 |
else if (!(inpflags & 04) &&
|
| 238 |
sscanf(buf,
|
| 239 |
"gxa(i) : select(i,%f,%f,%f,%f,%f,%f)",
|
| 240 |
&mb->xa[1][0], &mb->xa[1][1],
|
| 241 |
&mb->xa[1][2], &mb->xa[1][3],
|
| 242 |
&mb->xa[1][4], &mb->xa[1][5]
|
| 243 |
) == 6)
|
| 244 |
inpflags |= 04;
|
| 245 |
else if (!(inpflags & 010) &&
|
| 246 |
sscanf(buf,
|
| 247 |
"gya(i) : select(i,%f,%f,%f,%f,%f,%f)",
|
| 248 |
&mb->ya[1][0], &mb->ya[1][1],
|
| 249 |
&mb->ya[1][2], &mb->ya[1][3],
|
| 250 |
&mb->ya[1][4], &mb->ya[1][5]
|
| 251 |
) == 6)
|
| 252 |
inpflags |= 010;
|
| 253 |
else if (!(inpflags & 020) &&
|
| 254 |
sscanf(buf,
|
| 255 |
"bxa(i) : select(i,%f,%f,%f,%f,%f,%f)",
|
| 256 |
&mb->xa[2][0], &mb->xa[2][1],
|
| 257 |
&mb->xa[2][2], &mb->xa[2][3],
|
| 258 |
&mb->xa[2][4], &mb->xa[2][5]
|
| 259 |
) == 6)
|
| 260 |
inpflags |= 020;
|
| 261 |
else if (!(inpflags & 040) &&
|
| 262 |
sscanf(buf,
|
| 263 |
"bya(i) : select(i,%f,%f,%f,%f,%f,%f)",
|
| 264 |
&mb->ya[2][0], &mb->ya[2][1],
|
| 265 |
&mb->ya[2][2], &mb->ya[2][3],
|
| 266 |
&mb->ya[2][4], &mb->ya[2][5]
|
| 267 |
) == 6)
|
| 268 |
inpflags |= 040;
|
| 269 |
else if (!(inpflags & 0100) &&
|
| 270 |
sscanf(buf,
|
| 271 |
"ro = %f*rn + %f*gn + %f*bn",
|
| 272 |
&mb->cmat[0][0], &mb->cmat[0][1],
|
| 273 |
&mb->cmat[0][2]) == 3)
|
| 274 |
inpflags |= 0100;
|
| 275 |
else if (!(inpflags & 0200) &&
|
| 276 |
sscanf(buf,
|
| 277 |
"go = %f*rn + %f*gn + %f*bn",
|
| 278 |
&mb->cmat[1][0], &mb->cmat[1][1],
|
| 279 |
&mb->cmat[1][2]) == 3)
|
| 280 |
inpflags |= 0200;
|
| 281 |
else if (!(inpflags & 0400) &&
|
| 282 |
sscanf(buf,
|
| 283 |
"bo = %f*rn + %f*gn + %f*bn",
|
| 284 |
&mb->cmat[2][0], &mb->cmat[2][1],
|
| 285 |
&mb->cmat[2][2]) == 3)
|
| 286 |
inpflags |= 0400;
|
| 287 |
}
|
| 288 |
if (inpflags != 0777) {
|
| 289 |
fprintf(stderr,
|
| 290 |
"%s: cannot grok macbethcal file \"%s\" (inpflags==0%o)\n",
|
| 291 |
progname, fn, inpflags);
|
| 292 |
exit(1);
|
| 293 |
}
|
| 294 |
fclose(fp);
|
| 295 |
/* compute gamut */
|
| 296 |
for (i = 0; i < 3; i++) {
|
| 297 |
colval(mb->cmin,i) = mb->xa[i][0] -
|
| 298 |
mb->ya[i][0] *
|
| 299 |
(mb->xa[i][1]-mb->xa[i][0]) /
|
| 300 |
(mb->ya[i][1]-mb->ya[i][0]);
|
| 301 |
colval(mb->cmax,i) = mb->xa[i][4] +
|
| 302 |
(1.-mb->ya[i][4]) *
|
| 303 |
(mb->xa[i][5] - mb->xa[i][4]) /
|
| 304 |
(mb->ya[i][5] - mb->ya[i][4]);
|
| 305 |
}
|
| 306 |
}
|
