src/px/pcond.c

#ifndef lint
static const char       RCSid[] = "$Id$";
#endif
/*
 * Condition Radiance picture for display/output
 *  Added white-balance adjustment 10/01 (GW).
 */

#include "pcond.h"


#define LDMAX           100             /* default max. display luminance */
#define LDDYN           32              /* default dynamic range */

int     what2do = 0;                    /* desired adjustments */

double  ldmax = LDMAX;                  /* maximum output luminance */
double  lddyn = LDDYN;                  /* display dynamic range */
double  Bldmin, Bldmax;                 /* Bl(ldmax/lddyn) and Bl(ldmax) */

char    *progname;                      /* global argv[0] */

char    *infn;                          /* input file name */
FILE    *infp;                          /* input stream */
FILE    *mapfp = NULL;                  /* tone-mapping function stream */
VIEW    ourview = STDVIEW;              /* picture view */
int     gotview = 0;                    /* picture has view */
double  pixaspect = 1.0;                /* pixel aspect ratio */
double  fixfrac = 0.;                   /* histogram share due to fixations */
RESOLU  inpres;                         /* input picture resolution */

COLOR   *fovimg;                        /* foveal (1 degree) averaged image */
int     fvxr, fvyr;                     /* foveal image resolution */
float   *crfimg;                        /* contrast reduction factors */
short   (*fixlst)[2];                   /* fixation history list */
int     nfixations;                     /* number of fixation points */
double  bwhist[HISTRES];                /* luminance histogram */
double  histot;                         /* total count of histogram */
double  bwmin, bwmax;                   /* histogram limits */
double  bwavg;                          /* mean brightness */

double  scalef = 0.;                    /* linear scaling factor */


main(argc, argv)
int     argc;
char    *argv[];
{
        static RGBPRIMS outprimS;
        int     i;
#define bool(flg)               switch (argv[i][2]) { \
                                case '\0': what2do ^= flg; break; \
                                case 'y': case 'Y': case 't': case 'T': \
                                case '+': case '1': what2do |= flg; break; \
                                case 'n': case 'N': case 'f': case 'F': \
                                case '-': case '0': what2do &= ~(flg); break; \
                                default: goto userr; }

        progname = argv[0];

        for (i = 1; i < argc && argv[i][0] == '-'; i++)
                switch (argv[i][1]) {
                case 'h':
                        bool(DO_HUMAN);
                        break;
                case 'a':
                        bool(DO_ACUITY);
                        break;
                case 'v':
                        bool(DO_VEIL);
                        break;
                case 's':
                        bool(DO_HSENS);
                        break;
                case 'c':
                        bool(DO_COLOR);
                        break;
                case 'w':
                        bool(DO_CWEIGHT);
                        break;
                case 'i':
                        if (i+1 >= argc) goto userr;
                        fixfrac = atof(argv[++i]);
                        if (fixfrac > FTINY) what2do |= DO_FIXHIST;
                        else what2do &= ~DO_FIXHIST;
                        break;
                case 'I':
                        bool(DO_PREHIST);
                        break;
                case 'l':
                        bool(DO_LINEAR);
                        break;
                case 'p':
                        if (i+8 >= argc) goto userr;
                        outprimS[RED][CIEX] = atof(argv[++i]);
                        outprimS[RED][CIEY] = atof(argv[++i]);
                        outprimS[GRN][CIEX] = atof(argv[++i]);
                        outprimS[GRN][CIEY] = atof(argv[++i]);
                        outprimS[BLU][CIEX] = atof(argv[++i]);
                        outprimS[BLU][CIEY] = atof(argv[++i]);
                        outprimS[WHT][CIEX] = atof(argv[++i]);
                        outprimS[WHT][CIEY] = atof(argv[++i]);
                        outprims = outprimS;
                        break;
                case 'e':
                        if (i+1 >= argc) goto userr;
                        scalef = atof(argv[++i]);
                        if (argv[i][0] == '+' | argv[i][0] == '-')
                                scalef = pow(2.0, scalef);
                        what2do |= DO_LINEAR;
                        break;
                case 'f':
                        if (i+1 >= argc) goto userr;
                        mbcalfile = argv[++i];
                        break;
                case 'm':
                        if (i+1 >= argc) goto userr;
                        cwarpfile = argv[++i];
                        break;
                case 'u':
                        if (i+1 >= argc) goto userr;
                        ldmax = atof(argv[++i]);
                        if (ldmax <= FTINY)
                                goto userr;
                        break;
                case 'd':
                        if (i+1 >= argc) goto userr;
                        lddyn = atof(argv[++i]);
                        break;
                case 'x':
                        if (i+1 >= argc) goto userr;
                        if ((mapfp = fopen(argv[++i], "w")) == NULL) {
                                fprintf(stderr,
                                        "%s: cannot open for writing\n",
                                                argv[i]);
                                exit(1);
                        }
                        break;
                default:
                        goto userr;
                }
        if ((what2do & (DO_FIXHIST|DO_PREHIST)) == (DO_FIXHIST|DO_PREHIST)) {
                fprintf(stderr, "%s: only one of -i or -I option\n", progname);
                exit(1);
        }
        if ((mbcalfile != NULL) + (cwarpfile != NULL) +
                        (outprims != stdprims) > 1) {
                fprintf(stderr,
                        "%s: only one of -p, -m or -f option supported\n",
                                progname);
                exit(1);
        }
        if (outprims == stdprims & inprims != stdprims)
                outprims = inprims;
        Bldmin = Bl(ldmax/lddyn);
        Bldmax = Bl(ldmax);
        if (i >= argc || i+2 < argc)
                goto userr;
                                        /* open input file */
        if ((infp = fopen(infn=argv[i], "r")) == NULL)
                syserror(infn);
                                        /* open output file */
        if (i+2 == argc && freopen(argv[i+1], "w", stdout) == NULL)
                syserror(argv[i+1]);
#ifdef MSDOS
        setmode(fileno(infp), O_BINARY);
        setmode(fileno(stdout), O_BINARY);
#endif
        getahead();                     /* load input header */
        printargs(argc, argv, stdout);  /* add to output header */
        if (mbcalfile == NULL & outprims != stdprims)
                fputprims(outprims, stdout);
        if ((what2do & (DO_PREHIST|DO_VEIL|DO_ACUITY)) != DO_PREHIST)
                getfovimg();            /* get foveal sample image? */
        if (what2do&DO_PREHIST)         /* get histogram? */
                gethisto(stdin);
        else if (what2do&DO_FIXHIST)    /* get fixation history? */
                getfixations(stdin);
        mapimage();                     /* map the picture */
        if (mapfp != NULL)              /* write out basic mapping */
                putmapping(mapfp);
        exit(0);
userr:
        fprintf(stderr, "Usage: %s [-{h|a|v|s|c|l|w}[+-]][-I|-i ffrac][-e ev][-p xr yr xg yg xb yb xw yw|-f mbf.cal|-m rgb.cwp][-u Ldmax][-d Lddyn][-x mapfile] inpic [outpic]\n",
                        progname);
        exit(1);
#undef bool
}


syserror(s)                             /* report system error and exit */
char    *s;
{
        fprintf(stderr, "%s: ", progname);
        perror(s);
        exit(2);
}


headline(s)                             /* process header line */
char    *s;
{
        static RGBPRIMS inprimS;
        char    fmt[32];

        if (formatval(fmt, s)) {        /* check if format string */
                if (!strcmp(fmt,COLRFMT)) lumf = rgblum;
                else if (!strcmp(fmt,CIEFMT)) lumf = cielum;
                else lumf = NULL;
                return(0);              /* don't echo */
        }
        if (isprims(s)) {               /* get input primaries */
                primsval(inprimS, s);
                inprims= inprimS;
                return(0);              /* don't echo */
        }
        if (isexpos(s)) {               /* picture exposure */
                inpexp *= exposval(s);
                return(0);              /* don't echo */
        }
        if (isaspect(s))                /* pixel aspect ratio */
                pixaspect *= aspectval(s);
        if (isview(s))                  /* image view */
                gotview += sscanview(&ourview, s);
        return(fputs(s, stdout));
}


getahead()                      /* load picture header */
{
        char    *err;

        getheader(infp, headline, NULL);
        if (lumf == NULL || !fgetsresolu(&inpres, infp)) {
                fprintf(stderr, "%s: %s: not a Radiance picture\n",
                        progname, infn);
                exit(1);
        }
        if (lumf == rgblum)
                comprgb2xyzWBmat(inrgb2xyz, inprims);
        else if (mbcalfile != NULL) {
                fprintf(stderr, "%s: macbethcal only works with RGB pictures\n",
                                progname);
                exit(1);
        }
        if (!gotview || ourview.type == VT_PAR) {
                copystruct(&ourview, &stdview);
                ourview.type = VT_PER;
                if (pixaspect*inpres.yr < inpres.xr) {
                        ourview.horiz = 40.0;
                        ourview.vert = 2.*180./PI *
                                atan(.3639702*pixaspect*inpres.yr/inpres.xr);
                } else {
                        ourview.vert = 40.0;
                        ourview.horiz = 2.*180./PI *
                                atan(.3639702*inpres.xr/pixaspect/inpres.yr);
                }
        }
        if ((err = setview(&ourview)) != NULL) {
                fprintf(stderr, "%s: view error in picture \"%s\": %s\n",
                        progname, infn, err);
                exit(1);
        }
}


mapimage()                              /* map picture and send to stdout */
{
        COLOR   *scan;

        comphist();                     /* generate adaptation histogram */
        check2do();                     /* modify what2do flags */
        if (what2do&DO_VEIL)
                compveil();             /* compute veil image */
        if (!(what2do&DO_LINEAR))
                if (mkbrmap() < 0)      /* make tone map */
                        what2do |= DO_LINEAR;   /* failed! -- use linear */
#if ADJ_VEIL
                else if (what2do&DO_VEIL)
                        adjveil();      /* else adjust veil image */
#endif
        if (what2do&DO_LINEAR) {
                if (scalef <= FTINY) {
                        if (what2do&DO_HSENS)
                                scalef = htcontrs(Lb(0.5*(Bldmax+Bldmin))) /
                                                htcontrs(Lb(bwavg));
                        else
                                scalef = Lb(0.5*(Bldmax+Bldmin)) / Lb(bwavg);
                        scalef *= WHTEFFICACY/(inpexp*ldmax);
                }
                fputexpos(inpexp*scalef, stdout);       /* record exposure */
                if (lumf == cielum) scalef /= WHTEFFICACY;
        }
        fputformat(COLRFMT, stdout);    /* complete header */
        putchar('\n');
        fputsresolu(&inpres, stdout);   /* resolution doesn't change */
                                        /* condition our image */
        for (scan = firstscan(); scan != NULL; scan = nextscan())
                if (fwritescan(scan, scanlen(&inpres), stdout) < 0) {
                        fprintf(stderr, "%s: scanline write error\n",
                                        progname);
                        exit(1);
                }
}


getfovimg()                     /* load foveal sampled image */
{
        extern FILE     *popen();
        char    combuf[128];
        FILE    *fp;
        int     x, y;
                                                /* compute image size */
        fvxr = sqrt(ourview.hn2)/FOVDIA + 0.5;
        if (fvxr < 2) fvxr = 2;
        fvyr = sqrt(ourview.vn2)/FOVDIA + 0.5;
        if (fvyr < 2) fvyr = 2;
        if (!(inpres.rt & YMAJOR)) {            /* picture is rotated? */
                y = fvyr;
                fvyr = fvxr;
                fvxr = y;
        }
        if ((fovimg = (COLOR *)malloc(fvxr*fvyr*sizeof(COLOR))) == NULL)
                syserror("malloc");
        sprintf(combuf, "pfilt -1 -b -pa 0 -x %d -y %d %s", fvxr, fvyr, infn);
        if ((fp = popen(combuf, "r")) == NULL)
                syserror("popen");
        getheader(fp, NULL, NULL);      /* skip header */
        if (fgetresolu(&x, &y, fp) < 0 || x != fvxr | y != fvyr)
                goto readerr;
        for (y = 0; y < fvyr; y++)
                if (freadscan(fovscan(y), fvxr, fp) < 0)
                        goto readerr;
        pclose(fp);
        return;
readerr:
        fprintf(stderr, "%s: error reading from pfilt process in fovimage\n",
                        progname);
        exit(1);
}


check2do()              /* check histogram to see what isn't worth doing */
{
        double  sum;
        double  b, l;
        register int    i;

                                        /* check for within display range */
        if (bwmax - bwmin <= Bldmax - Bldmin)
                what2do |= DO_LINEAR;
                                        /* determine if veiling significant */
        if (bwmax - bwmin < 4.5)                /* heuristic */
                what2do &= ~DO_VEIL;

        if (!(what2do & (DO_ACUITY|DO_COLOR)))
                return;
                                        /* find 5th percentile */
        sum = histot*0.05;
        for (i = 0; i < HISTRES; i++)
                if ((sum -= bwhist[i]) <= 0)
                        break;
        b = (i+.5)*(bwmax-bwmin)/HISTRES + bwmin;
        l = Lb(b);
                                        /* determine if acuity adj. useful */
        if (what2do&DO_ACUITY &&
                        hacuity(l) >= (inpres.xr/sqrt(ourview.hn2) +
                        inpres.yr/sqrt(ourview.vn2))/(2.*180./PI))
                what2do &= ~DO_ACUITY;
                                        /* color sensitivity loss? */
        if (l >= TopMesopic)
                what2do &= ~DO_COLOR;
}
Revision:	3.14
Committed:	Sat Feb 22 02:07:27 2003 UTC (21 years, 2 months ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad3R5
Changes since 3.13:	+15 -11 lines
Log Message:	Changes and check-in for 3.5 release Includes new source files and modifications not recorded for many years See ray/doc/notes/ReleaseNotes for notes between 3.1 and 3.5 release
#	User	Rev	Content
1	greg	3.1	#ifndef lint
2	greg	3.14	static const char RCSid[] = "$Id$";
3	greg	3.1	#endif
4			/*
5			* Condition Radiance picture for display/output
6	greg	3.14	* Added white-balance adjustment 10/01 (GW).
7	greg	3.1	*/
8
9			#include "pcond.h"
10
11
12			#define LDMAX 100 /* default max. display luminance */
13	greg	3.11	#define LDDYN 32 /* default dynamic range */
14	greg	3.1
15			int what2do = 0; /* desired adjustments */
16
17			double ldmax = LDMAX; /* maximum output luminance */
18	greg	3.11	double lddyn = LDDYN; /* display dynamic range */
19			double Bldmin, Bldmax; /* Bl(ldmax/lddyn) and Bl(ldmax) */
20	greg	3.1
21			char progname; / global argv[0] */
22
23			char infn; / input file name */
24			FILE infp; / input stream */
25	greg	3.6	FILE mapfp = NULL; / tone-mapping function stream */
26	greg	3.1	VIEW ourview = STDVIEW; /* picture view */
27			int gotview = 0; /* picture has view */
28			double pixaspect = 1.0; /* pixel aspect ratio */
29	greg	3.9	double fixfrac = 0.; /* histogram share due to fixations */
30	greg	3.1	RESOLU inpres; /* input picture resolution */
31
32			COLOR fovimg; / foveal (1 degree) averaged image */
33	greg	3.14	int fvxr, fvyr; /* foveal image resolution */
34			float crfimg; / contrast reduction factors */
35	greg	3.9	short (fixlst)[2]; / fixation history list */
36			int nfixations; /* number of fixation points */
37	greg	3.14	double bwhist[HISTRES]; /* luminance histogram */
38	greg	3.8	double histot; /* total count of histogram */
39	greg	3.1	double bwmin, bwmax; /* histogram limits */
40			double bwavg; /* mean brightness */
41
42			double scalef = 0.; /* linear scaling factor */
43
44
45			main(argc, argv)
46			int argc;
47			char *argv[];
48			{
49			static RGBPRIMS outprimS;
50			int i;
51			#define bool(flg) switch (argv[i][2]) { \
52			case '\0': what2do ^= flg; break; \
53			case 'y': case 'Y': case 't': case 'T': \
54			case '+': case '1': what2do \|= flg; break; \
55			case 'n': case 'N': case 'f': case 'F': \
56			case '-': case '0': what2do &= ~(flg); break; \
57			default: goto userr; }
58
59			progname = argv[0];
60
61			for (i = 1; i < argc && argv[i][0] == '-'; i++)
62			switch (argv[i][1]) {
63			case 'h':
64			bool(DO_HUMAN);
65			break;
66			case 'a':
67			bool(DO_ACUITY);
68			break;
69			case 'v':
70			bool(DO_VEIL);
71			break;
72			case 's':
73			bool(DO_HSENS);
74			break;
75			case 'c':
76			bool(DO_COLOR);
77			break;
78			case 'w':
79			bool(DO_CWEIGHT);
80			break;
81	greg	3.9	case 'i':
82			if (i+1 >= argc) goto userr;
83			fixfrac = atof(argv[++i]);
84			if (fixfrac > FTINY) what2do \|= DO_FIXHIST;
85			else what2do &= ~DO_FIXHIST;
86			break;
87	gwlarson	3.12	case 'I':
88			bool(DO_PREHIST);
89			break;
90	greg	3.1	case 'l':
91			bool(DO_LINEAR);
92			break;
93			case 'p':
94			if (i+8 >= argc) goto userr;
95			outprimS[RED][CIEX] = atof(argv[++i]);
96			outprimS[RED][CIEY] = atof(argv[++i]);
97			outprimS[GRN][CIEX] = atof(argv[++i]);
98			outprimS[GRN][CIEY] = atof(argv[++i]);
99			outprimS[BLU][CIEX] = atof(argv[++i]);
100			outprimS[BLU][CIEY] = atof(argv[++i]);
101			outprimS[WHT][CIEX] = atof(argv[++i]);
102			outprimS[WHT][CIEY] = atof(argv[++i]);
103			outprims = outprimS;
104			break;
105			case 'e':
106			if (i+1 >= argc) goto userr;
107			scalef = atof(argv[++i]);
108			if (argv[i][0] == '+' \| argv[i][0] == '-')
109			scalef = pow(2.0, scalef);
110			what2do \|= DO_LINEAR;
111			break;
112			case 'f':
113			if (i+1 >= argc) goto userr;
114			mbcalfile = argv[++i];
115			break;
116	greg	3.10	case 'm':
117			if (i+1 >= argc) goto userr;
118			cwarpfile = argv[++i];
119			break;
120	greg	3.11	case 'u':
121	greg	3.1	if (i+1 >= argc) goto userr;
122			ldmax = atof(argv[++i]);
123			if (ldmax <= FTINY)
124			goto userr;
125			break;
126	greg	3.11	case 'd':
127	greg	3.1	if (i+1 >= argc) goto userr;
128	greg	3.11	lddyn = atof(argv[++i]);
129	greg	3.1	break;
130	greg	3.11	case 'x':
131	greg	3.6	if (i+1 >= argc) goto userr;
132			if ((mapfp = fopen(argv[++i], "w")) == NULL) {
133			fprintf(stderr,
134			"%s: cannot open for writing\n",
135			argv[i]);
136			exit(1);
137			}
138			break;
139	greg	3.1	default:
140			goto userr;
141			}
142	gwlarson	3.12	if ((what2do & (DO_FIXHIST\|DO_PREHIST)) == (DO_FIXHIST\|DO_PREHIST)) {
143			fprintf(stderr, "%s: only one of -i or -I option\n", progname);
144			exit(1);
145			}
146	greg	3.10	if ((mbcalfile != NULL) + (cwarpfile != NULL) +
147			(outprims != stdprims) > 1) {
148			fprintf(stderr,
149			"%s: only one of -p, -m or -f option supported\n",
150	greg	3.1	progname);
151			exit(1);
152			}
153			if (outprims == stdprims & inprims != stdprims)
154			outprims = inprims;
155	greg	3.11	Bldmin = Bl(ldmax/lddyn);
156	greg	3.1	Bldmax = Bl(ldmax);
157			if (i >= argc \|\| i+2 < argc)
158			goto userr;
159	greg	3.9	/* open input file */
160	greg	3.1	if ((infp = fopen(infn=argv[i], "r")) == NULL)
161			syserror(infn);
162	greg	3.9	/* open output file */
163	greg	3.1	if (i+2 == argc && freopen(argv[i+1], "w", stdout) == NULL)
164			syserror(argv[i+1]);
165			#ifdef MSDOS
166			setmode(fileno(infp), O_BINARY);
167			setmode(fileno(stdout), O_BINARY);
168			#endif
169			getahead(); /* load input header */
170			printargs(argc, argv, stdout); /* add to output header */
171	greg	3.9	if (mbcalfile == NULL & outprims != stdprims)
172	greg	3.1	fputprims(outprims, stdout);
173	gwlarson	3.12	if ((what2do & (DO_PREHIST\|DO_VEIL\|DO_ACUITY)) != DO_PREHIST)
174			getfovimg(); /* get foveal sample image? */
175			if (what2do&DO_PREHIST) /* get histogram? */
176			gethisto(stdin);
177			else if (what2do&DO_FIXHIST) /* get fixation history? */
178	greg	3.9	getfixations(stdin);
179	greg	3.1	mapimage(); /* map the picture */
180	greg	3.6	if (mapfp != NULL) /* write out basic mapping */
181			putmapping(mapfp);
182	greg	3.1	exit(0);
183			userr:
184	gwlarson	3.12	fprintf(stderr, "Usage: %s [-{h\|a\|v\|s\|c\|l\|w}[+-]][-I\|-i ffrac][-e ev][-p xr yr xg yg xb yb xw yw\|-f mbf.cal\|-m rgb.cwp][-u Ldmax][-d Lddyn][-x mapfile] inpic [outpic]\n",
185	greg	3.1	progname);
186			exit(1);
187			#undef bool
188			}
189
190
191			syserror(s) /* report system error and exit */
192			char *s;
193			{
194			fprintf(stderr, "%s: ", progname);
195			perror(s);
196			exit(2);
197			}
198
199
200			headline(s) /* process header line */
201			char *s;
202			{
203			static RGBPRIMS inprimS;
204			char fmt[32];
205
206			if (formatval(fmt, s)) { /* check if format string */
207			if (!strcmp(fmt,COLRFMT)) lumf = rgblum;
208			else if (!strcmp(fmt,CIEFMT)) lumf = cielum;
209			else lumf = NULL;
210	gwlarson	3.13	return(0); /* don't echo */
211	greg	3.1	}
212			if (isprims(s)) { /* get input primaries */
213			primsval(inprimS, s);
214			inprims= inprimS;
215	gwlarson	3.13	return(0); /* don't echo */
216	greg	3.1	}
217			if (isexpos(s)) { /* picture exposure */
218			inpexp *= exposval(s);
219	gwlarson	3.13	return(0); /* don't echo */
220	greg	3.1	}
221			if (isaspect(s)) /* pixel aspect ratio */
222			pixaspect *= aspectval(s);
223			if (isview(s)) /* image view */
224			gotview += sscanview(&ourview, s);
225	gwlarson	3.13	return(fputs(s, stdout));
226	greg	3.1	}
227
228
229			getahead() /* load picture header */
230			{
231			char *err;
232
233			getheader(infp, headline, NULL);
234			if (lumf == NULL \|\| !fgetsresolu(&inpres, infp)) {
235			fprintf(stderr, "%s: %s: not a Radiance picture\n",
236			progname, infn);
237			exit(1);
238			}
239			if (lumf == rgblum)
240	greg	3.14	comprgb2xyzWBmat(inrgb2xyz, inprims);
241	greg	3.1	else if (mbcalfile != NULL) {
242			fprintf(stderr, "%s: macbethcal only works with RGB pictures\n",
243			progname);
244			exit(1);
245			}
246			if (!gotview \|\| ourview.type == VT_PAR) {
247			copystruct(&ourview, &stdview);
248			ourview.type = VT_PER;
249			if (pixaspect*inpres.yr < inpres.xr) {
250			ourview.horiz = 40.0;
251			ourview.vert = 2.180./PI
252			atan(.3639702pixaspectinpres.yr/inpres.xr);
253			} else {
254			ourview.vert = 40.0;
255			ourview.horiz = 2.180./PI
256			atan(.3639702*inpres.xr/pixaspect/inpres.yr);
257			}
258			}
259			if ((err = setview(&ourview)) != NULL) {
260			fprintf(stderr, "%s: view error in picture \"%s\": %s\n",
261			progname, infn, err);
262			exit(1);
263			}
264			}
265
266
267			mapimage() /* map picture and send to stdout */
268			{
269			COLOR *scan;
270
271	greg	3.8	comphist(); /* generate adaptation histogram */
272	greg	3.1	check2do(); /* modify what2do flags */
273	greg	3.9	if (what2do&DO_VEIL)
274	greg	3.14	compveil(); /* compute veil image */
275			if (!(what2do&DO_LINEAR))
276			if (mkbrmap() < 0) /* make tone map */
277			what2do \|= DO_LINEAR; /* failed! -- use linear */
278			#if ADJ_VEIL
279			else if (what2do&DO_VEIL)
280			adjveil(); /* else adjust veil image */
281			#endif
282	greg	3.1	if (what2do&DO_LINEAR) {
283			if (scalef <= FTINY) {
284			if (what2do&DO_HSENS)
285			scalef = htcontrs(Lb(0.5*(Bldmax+Bldmin))) /
286			htcontrs(Lb(bwavg));
287			else
288			scalef = Lb(0.5*(Bldmax+Bldmin)) / Lb(bwavg);
289			scalef = WHTEFFICACY/(inpexpldmax);
290			}
291	greg	3.4	fputexpos(inpexpscalef, stdout); / record exposure */
292	greg	3.1	if (lumf == cielum) scalef /= WHTEFFICACY;
293			}
294	greg	3.9	fputformat(COLRFMT, stdout); /* complete header */
295			putchar('\n');
296	greg	3.1	fputsresolu(&inpres, stdout); /* resolution doesn't change */
297	greg	3.9	/* condition our image */
298	greg	3.1	for (scan = firstscan(); scan != NULL; scan = nextscan())
299			if (fwritescan(scan, scanlen(&inpres), stdout) < 0) {
300			fprintf(stderr, "%s: scanline write error\n",
301			progname);
302			exit(1);
303			}
304			}
305
306
307	greg	3.8	getfovimg() /* load foveal sampled image */
308	greg	3.1	{
309			extern FILE *popen();
310			char combuf[128];
311			FILE *fp;
312			int x, y;
313	greg	3.8	/* compute image size */
314	greg	3.1	fvxr = sqrt(ourview.hn2)/FOVDIA + 0.5;
315			if (fvxr < 2) fvxr = 2;
316			fvyr = sqrt(ourview.vn2)/FOVDIA + 0.5;
317			if (fvyr < 2) fvyr = 2;
318	greg	3.14	if (!(inpres.rt & YMAJOR)) { /* picture is rotated? */
319	greg	3.1	y = fvyr;
320			fvyr = fvxr;
321			fvxr = y;
322			}
323			if ((fovimg = (COLOR )malloc(fvxrfvyr*sizeof(COLOR))) == NULL)
324			syserror("malloc");
325	greg	3.9	sprintf(combuf, "pfilt -1 -b -pa 0 -x %d -y %d %s", fvxr, fvyr, infn);
326	greg	3.1	if ((fp = popen(combuf, "r")) == NULL)
327			syserror("popen");
328			getheader(fp, NULL, NULL); /* skip header */
329			if (fgetresolu(&x, &y, fp) < 0 \|\| x != fvxr \| y != fvyr)
330			goto readerr;
331			for (y = 0; y < fvyr; y++)
332			if (freadscan(fovscan(y), fvxr, fp) < 0)
333			goto readerr;
334			pclose(fp);
335	greg	3.8	return;
336			readerr:
337			fprintf(stderr, "%s: error reading from pfilt process in fovimage\n",
338			progname);
339			exit(1);
340			}
341
342
343	greg	3.1	check2do() /* check histogram to see what isn't worth doing */
344			{
345	greg	3.8	double sum;
346	greg	3.1	double b, l;
347			register int i;
348
349			/* check for within display range */
350	greg	3.9	if (bwmax - bwmin <= Bldmax - Bldmin)
351	greg	3.1	what2do \|= DO_LINEAR;
352	greg	3.3	/* determine if veiling significant */
353	greg	3.9	if (bwmax - bwmin < 4.5) /* heuristic */
354	greg	3.3	what2do &= ~DO_VEIL;
355	greg	3.1
356	greg	3.3	if (!(what2do & (DO_ACUITY\|DO_COLOR)))
357	greg	3.1	return;
358			/* find 5th percentile */
359	greg	3.8	sum = histot*0.05;
360	greg	3.1	for (i = 0; i < HISTRES; i++)
361			if ((sum -= bwhist[i]) <= 0)
362			break;
363			b = (i+.5)*(bwmax-bwmin)/HISTRES + bwmin;
364			l = Lb(b);
365			/* determine if acuity adj. useful */
366			if (what2do&DO_ACUITY &&
367			hacuity(l) >= (inpres.xr/sqrt(ourview.hn2) +
368	greg	3.5	inpres.yr/sqrt(ourview.vn2))/(2.*180./PI))
369	greg	3.1	what2do &= ~DO_ACUITY;
370			/* color sensitivity loss? */
371	greg	3.5	if (l >= TopMesopic)
372	greg	3.1	what2do &= ~DO_COLOR;
373			}