src/px/falsecolor.pl

#!/usr/bin/perl -w
# RCSid $Id: falsecolor.pl,v 2.4 2011/03/23 21:57:11 greg Exp $

use warnings;
use strict;
use File::Temp qw/ tempdir /;
use POSIX qw/ floor /;

my @palettes = ('def', 'spec', 'pm3d', 'hot');

my $mult = 179.0;              # Multiplier. Default W/sr/m2 -> cd/m2
my $label = 'cd/m2';           # Units shown in legend
my $scale = 1000;              # Top of the scale
my $decades = 0;               # Default is linear mapping
my $pal = 'def';               # Palette
my $redv = "${pal}_red(v)";    # Mapping functions for R,G,B
my $grnv = "${pal}_grn(v)";
my $bluv = "${pal}_blu(v)";
my $ndivs = 8;                 # Number of lines in legend
my $picture = '-';
my $cpict = '';
my $legwidth = 100;            # Legend width and height
my $legheight = 200;
my $docont = '';               # Contours
my $loff = 0;                  # Offset to align with values
my $doextrem = 0;              # Don't mark extrema
my $needfile = 0;

while ($#ARGV >= 0) {
    $_ = shift;
    # Options with qualifiers
    if (m/-lw/) {              # Legend width
        $legwidth = shift;
    } elsif (m/-lh/) {         # Legend height
        $legheight = shift;
    } elsif (m/-m/) {          # Multiplier
        $mult = shift;
    } elsif (m/-s/) {          # Scale
        $scale = shift;
        if ($scale =~ m/[aA].*/) {
            $needfile = 1;
        }
    } elsif (m/-l$/) {         # Label
        $label = shift;
    } elsif (m/-log/) {        # Logarithmic mapping
        $decades = shift;
    } elsif (m/-r/) {          # Custom palette functions for R,G,B
        $redv = shift;
    } elsif (m/-g/) {
        $grnv = shift;
    } elsif (m/-b/) {
        $bluv = shift;
    } elsif (m/-pal$/) {        # Color palette
        $pal = shift;
        if (! grep $_ eq $pal, @palettes) {
            die("invalid palette '$pal'.\n");
        }
        $redv = "${pal}_red(v)";
        $grnv = "${pal}_grn(v)";
        $bluv = "${pal}_blu(v)";
    } elsif (m/-i$/) {          # Image for intensity mapping
        $picture = shift;
    } elsif (m/-p$/) {         # Image for background
        $cpict = shift;
    } elsif (m/-ip/ || m/-pi/) {
        $picture = shift;
        $cpict = $picture;
    } elsif (m/-n/) {          # Number of contour lines
        $ndivs = shift;

    # Switches
    } elsif (m/-cl/) {         # Contour lines
        $docont = 'a';
        $loff = 0.48;
    } elsif (m/-cb/) {         # Contour bands
        $docont = 'b';
        $loff = 0.52;
    } elsif (m/-e/) {
        $doextrem = 1;
        $needfile = 1;

    # Oops! Illegal option
    } else {
        die("bad option \"$_\"\n");
    }
}

# Temporary directory. Will be removed upon successful program exit.
my $td = tempdir( CLEANUP => 1 );

if ($needfile == 1 && $picture eq '-') {
    # Pretend that $td/stdin.rad is the actual filename.
    $picture = "$td/stdin.hdr";
    open(FHpic, ">$picture") or
            die("Unable to write to file $picture\n");
    # Input is from STDIN: Capture to file.
    while (<>) {
        print FHpic;
    }
    close(FHpic);

    if ($cpict eq '-') {
        $cpict =  "$td/stdin.hdr";
    }
}

# Find a good scale for auto mode.
if ($scale =~ m/[aA].*/) {
    my @histo = split(/\s/, `phisto $picture| tail -2`);
    # e.g. $ phisto tests/richmond.hdr| tail -2
    # 3.91267   14
    # 3.94282   6
    my $LogLmax = $histo[0];
    $scale = $mult / 179 * 10**$LogLmax;
}

my $pc0 = "$td/pc0.cal";
open(FHpc0, ">$pc0");
print FHpc0 <<EndOfPC0;
PI : 3.14159265358979323846 ;
scale : $scale ;
mult : $mult ;
ndivs : $ndivs ;
gamma : 2.2;

or(a,b) : if(a,a,b);
EPS : 1e-7;
neq(a,b) : if(a-b-EPS,1,b-a-EPS);
btwn(a,x,b) : if(a-x,-1,b-x);
clip(x) : if(x-1,1,if(x,x,0));
frac(x) : x - floor(x);
boundary(a,b) : neq(floor(ndivs*a+.5),floor(ndivs*b+.5));

spec_red(x) = 1.6*x - .6;
spec_grn(x) = if(x-.375, 1.6-1.6*x, 8/3*x);
spec_blu(x) = 1 - 8/3*x;

pm3d_red(x) = sqrt(x) ^ gamma;
pm3d_grn(x) = (x*x*x) ^ gamma;
pm3d_blu(x) = clip(sin(2*PI*x)) ^ gamma;

hot_red(x) = clip(3*x) ^ gamma;
hot_grn(x) = clip(3*x - 1) ^ gamma;
hot_blu(x) = clip(3*x - 2) ^ gamma;

interp_arr2(i,x,f):(i+1-x)*f(i)+(x-i)*f(i+1);
interp_arr(x,f):if(x-1,if(f(0)-x,interp_arr2(floor(x),x,f),f(f(0))),f(1));

def_redp(i):select(i,0.18848,0.05468174,
0.00103547,8.311144e-08,7.449763e-06,0.0004390987,0.001367254,
0.003076,0.01376382,0.06170773,0.1739422,0.2881156,0.3299725,
0.3552663,0.372552,0.3921184,0.4363976,0.6102754,0.7757267,
0.9087369,1,1,0.9863);
def_red(x):interp_arr(x/0.0454545+1,def_redp);

def_grnp(i):select(i,0.0009766,2.35501e-05,
0.0008966244,0.0264977,0.1256843,0.2865799,0.4247083,0.4739468,
0.4402732,0.3671876,0.2629843,0.1725325,0.1206819,0.07316644,
0.03761026,0.01612362,0.004773749,6.830967e-06,0.00803605,
0.1008085,0.3106831,0.6447838,0.9707);
def_grn(x):interp_arr(x/0.0454545+1,def_grnp);

def_blup(i):select(i,0.2666,0.3638662,0.4770437,
0.5131397,0.5363797,0.5193677,0.4085123,0.1702815,0.05314236,
0.05194055,0.08564082,0.09881395,0.08324373,0.06072902,
0.0391076,0.02315354,0.01284458,0.005184709,0.001691774,
2.432735e-05,1.212949e-05,0.006659406,0.02539);
def_blu(x):interp_arr(x/0.0454545+1,def_blup);

isconta = if(btwn(0,v,1),or(boundary(vleft,vright),boundary(vabove,vbelow)),-1);
iscontb = if(btwn(0,v,1),btwn(.4,frac(ndivs*v),.6),-1);

ra = 0;
ga = 0;
ba = 0;

in = 1;

ro = if(in,clip($redv),ra);
go = if(in,clip($grnv),ga);
bo = if(in,clip($bluv),ba);
EndOfPC0

my $pc1 = "$td/pc1.cal";
open(FHpc1, ">$pc1");
print FHpc1 <<EndOfPC1;
norm : mult/scale/le(1);

v = map(li(1)*norm);

vleft = map(li(1,-1,0)*norm);
vright = map(li(1,1,0)*norm);
vabove = map(li(1,0,1)*norm);
vbelow = map(li(1,0,-1)*norm);

map(x) = x;

ra = ri(nfiles);
ga = gi(nfiles);
ba = bi(nfiles);
EndOfPC1

my $pc0args = "-f $pc0";
my $pc1args = "-f $pc1";

# Contour lines or bands
if ($docont ne '') {
    $pc0args .= " -e 'in=iscont$docont'";
}

if ($cpict eq '') {
    $pc1args .= " -e 'ra=0;ga=0;ba=0'";
} elsif ($cpict eq $picture) {
    $cpict = '';
}

# Logarithmic mapping
if ($decades > 0) {
    $pc1args .= " -e 'map(x)=if(x-10^-$decades,log10(x)/$decades+1,0)'";
}

# Colours in the legend
my $scolpic = "$td/scol.hdr";
# Labels in the legend
my $slabpic = "$td/slab.hdr";
my $cmd;

if (($legwidth > 20) && ($legheight > 40)) {
    # Legend: Create the text labels
    my $sheight = floor($legheight / $ndivs + 0.5);
    $legheight = $sheight * $ndivs;
    $loff = floor($loff * $sheight + 0.5);
    my $text = "$label";
    for (my $i=0; $i<$ndivs; $i++) {
        my $imap = ($ndivs - 0.5 - $i) / $ndivs;
        my $value = $scale;
        if ($decades > 0) {
            $value *= 10**(($imap - 1) * $decades);
        } else {
            $value *= $imap;
        }
        # Have no more than 3 decimal places
        $value =~ s/(\.[0-9]{3})[0-9]*/$1/;
        $text .= "\n$value";
    }
    $cmd = "echo '$text' | psign -s -.15 -cf 1 1 1 -cb 0 0 0";
    $cmd .= " -h $sheight > $slabpic";
    system $cmd;

    # Legend: Create the background colours
    $cmd = "pcomb $pc0args -e 'v=(y+.5)/yres;vleft=v;vright=v'";
    $cmd .= " -e 'vbelow=(y-.5)/yres;vabove=(y+1.5)/yres'";
    $cmd .= " -x $legwidth -y $legheight > $scolpic";
    system $cmd;
} else {
    # Legend is too small to be legible. Don't bother doing one.
    $legwidth = 0;
    $legheight = 0;
    $loff = 0;
    # Create dummy colour scale and legend labels so we don't
    # need to change the final command line.
    open(FHscolpic, ">$scolpic");
    print FHscolpic "\n-Y 1 +X 1\naaa\n";
    close(FHscolpic);
    open(FHslabpic, ">$slabpic");
    print FHslabpic "\n-Y 1 +X 1\naaa\n";
    close(FHslabpic);
}

# Legend: Invert the text labels (for dropshadow)
my $slabinvpic = "$td/slabinv.hdr";
$cmd = "pcomb -e 'lo=1-gi(1)' $slabpic > $slabinvpic";
system $cmd;

my $loff1 = $loff - 1;
# Command line without extrema
$cmd = "pcomb $pc0args $pc1args $picture $cpict";
$cmd .= "| pcompos $scolpic 0 0 +t .1 $slabinvpic 2 $loff1";
$cmd .= " -t .5 $slabpic 0 $loff - $legwidth 0";

if ($doextrem == 1) {
    # Get min/max image luminance
    my $cmd1 = 'pextrem -o ' . $picture;
    my $retval = `$cmd1`;
    # e.g.
    # x   y   r            g            b
    # 193 207 3.070068e-02 3.118896e-02 1.995850e-02
    # 211 202 1.292969e+00 1.308594e+00 1.300781e+00

    my @extrema = split(/\s/, $retval);
    my ($lxmin, $ymin, $rmin, $gmin, $bmin, $lxmax, $ymax, $rmax, $gmax, $bmax) = @extrema;
    $lxmin += $legwidth;
    $lxmax += $legwidth;

    # Weighted average of R,G,B
    my $minpos = "$lxmin $ymin";
    my $minval = ($rmin * .27 + $gmin * .67 + $bmin * .06) * $mult;
    $minval =~ s/(\.[0-9]{3})[0-9]*/$1/;
    my $maxpos = "$lxmax $ymax";
    my $maxval = ($rmax * .27 + $gmax * .67 + $bmax * .06) * $mult;
    $maxval =~ s/(\.[0-9]{3})[0-9]*/$1/;

    # Create the labels for min/max intensity
    my $minvpic = "$td/minv.hdr";
    $cmd1 = "psign -s -.15 -a 2 -h 16 $minval > $minvpic";
    system $cmd1;
    my $maxvpic = "$td/maxv.hdr";
    $cmd1 = "psign -s -.15 -a 2 -h 16 $maxval > $maxvpic";
    system $cmd1;

    # Add extrema labels to command line
    $cmd .= " $minvpic $minpos $maxvpic $maxpos";
}

# Process image and combine with legend
system "$cmd";

#EOF
Revision:	2.5
Committed:	Wed Oct 26 03:42:49 2011 UTC (12 years, 6 months ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad4R1
Changes since 2.4:	+86 -92 lines
Log Message:	New features and bug fixes by Axel Jacobs
#	User	Rev	Content
1	greg	2.1	#!/usr/bin/perl -w
2	greg	2.5	# RCSid $Id: falsecolor.pl,v 2.4 2011/03/23 21:57:11 greg Exp $
3	greg	2.1
4	greg	2.5	use warnings;
5	greg	2.1	use strict;
6			use File::Temp qw/ tempdir /;
7			use POSIX qw/ floor /;
8
9	greg	2.5	my @palettes = ('def', 'spec', 'pm3d', 'hot');
10
11			my $mult = 179.0; # Multiplier. Default W/sr/m2 -> cd/m2
12			my $label = 'cd/m2'; # Units shown in legend
13			my $scale = 1000; # Top of the scale
14			my $decades = 0; # Default is linear mapping
15			my $pal = 'def'; # Palette
16			my $redv = "${pal}_red(v)"; # Mapping functions for R,G,B
17			my $grnv = "${pal}_grn(v)";
18			my $bluv = "${pal}_blu(v)";
19			my $ndivs = 8; # Number of lines in legend
20	greg	2.1	my $picture = '-';
21			my $cpict = '';
22	greg	2.5	my $legwidth = 100; # Legend width and height
23	greg	2.1	my $legheight = 200;
24	greg	2.5	my $docont = ''; # Contours
25			my $loff = 0; # Offset to align with values
26			my $doextrem = 0; # Don't mark extrema
27	greg	2.1	my $needfile = 0;
28
29			while ($#ARGV >= 0) {
30	greg	2.5	$_ = shift;
31			# Options with qualifiers
32			if (m/-lw/) { # Legend width
33			$legwidth = shift;
34			} elsif (m/-lh/) { # Legend height
35			$legheight = shift;
36			} elsif (m/-m/) { # Multiplier
37			$mult = shift;
38			} elsif (m/-s/) { # Scale
39			$scale = shift;
40	greg	2.1	if ($scale =~ m/[aA].*/) {
41			$needfile = 1;
42			}
43	greg	2.5	} elsif (m/-l$/) { # Label
44			$label = shift;
45			} elsif (m/-log/) { # Logarithmic mapping
46			$decades = shift;
47			} elsif (m/-r/) { # Custom palette functions for R,G,B
48			$redv = shift;
49			} elsif (m/-g/) {
50			$grnv = shift;
51			} elsif (m/-b/) {
52			$bluv = shift;
53			} elsif (m/-pal$/) { # Color palette
54			$pal = shift;
55			if (! grep $_ eq $pal, @palettes) {
56			die("invalid palette '$pal'.\n");
57			}
58			$redv = "${pal}_red(v)";
59			$grnv = "${pal}_grn(v)";
60			$bluv = "${pal}_blu(v)";
61			} elsif (m/-i$/) { # Image for intensity mapping
62			$picture = shift;
63			} elsif (m/-p$/) { # Image for background
64			$cpict = shift;
65			} elsif (m/-ip/ \|\| m/-pi/) {
66			$picture = shift;
67			$cpict = $picture;
68			} elsif (m/-n/) { # Number of contour lines
69			$ndivs = shift;
70	greg	2.1
71	greg	2.5	# Switches
72			} elsif (m/-cl/) { # Contour lines
73	greg	2.1	$docont = 'a';
74	greg	2.4	$loff = 0.48;
75	greg	2.5	} elsif (m/-cb/) { # Contour bands
76	greg	2.1	$docont = 'b';
77	greg	2.4	$loff = 0.52;
78	greg	2.5	} elsif (m/-e/) {
79	greg	2.1	$doextrem = 1;
80			$needfile = 1;
81
82	greg	2.5	# Oops! Illegal option
83	greg	2.1	} else {
84	greg	2.5	die("bad option \"$_\"\n");
85	greg	2.1	}
86			}
87
88			# Temporary directory. Will be removed upon successful program exit.
89			my $td = tempdir( CLEANUP => 1 );
90
91			if ($needfile == 1 && $picture eq '-') {
92	greg	2.5	# Pretend that $td/stdin.rad is the actual filename.
93	greg	2.3	$picture = "$td/stdin.hdr";
94	greg	2.1	open(FHpic, ">$picture") or
95			die("Unable to write to file $picture\n");
96	greg	2.5	# Input is from STDIN: Capture to file.
97			while (<>) {
98			print FHpic;
99			}
100	greg	2.1	close(FHpic);
101	greg	2.3
102	greg	2.5	if ($cpict eq '-') {
103			$cpict = "$td/stdin.hdr";
104			}
105	greg	2.1	}
106
107			# Find a good scale for auto mode.
108			if ($scale =~ m/[aA].*/) {
109	greg	2.5	my @histo = split(/\s/, `phisto $picture\| tail -2`);
110			# e.g. $ phisto tests/richmond.hdr\| tail -2
111			# 3.91267 14
112			# 3.94282 6
113			my $LogLmax = $histo[0];
114	greg	2.1	$scale = $mult / 179 * 10**$LogLmax;
115			}
116
117	greg	2.3	my $pc0 = "$td/pc0.cal";
118	greg	2.1	open(FHpc0, ">$pc0");
119			print FHpc0 <<EndOfPC0;
120			PI : 3.14159265358979323846 ;
121			scale : $scale ;
122			mult : $mult ;
123			ndivs : $ndivs ;
124			gamma : 2.2;
125
126			or(a,b) : if(a,a,b);
127			EPS : 1e-7;
128			neq(a,b) : if(a-b-EPS,1,b-a-EPS);
129			btwn(a,x,b) : if(a-x,-1,b-x);
130			clip(x) : if(x-1,1,if(x,x,0));
131			frac(x) : x - floor(x);
132			boundary(a,b) : neq(floor(ndivsa+.5),floor(ndivsb+.5));
133
134			spec_red(x) = 1.6*x - .6;
135			spec_grn(x) = if(x-.375, 1.6-1.6x, 8/3x);
136			spec_blu(x) = 1 - 8/3*x;
137
138			pm3d_red(x) = sqrt(x) ^ gamma;
139	greg	2.5	pm3d_grn(x) = (xxx) ^ gamma;
140	greg	2.1	pm3d_blu(x) = clip(sin(2PIx)) ^ gamma;
141
142			hot_red(x) = clip(3*x) ^ gamma;
143			hot_grn(x) = clip(3*x - 1) ^ gamma;
144			hot_blu(x) = clip(3*x - 2) ^ gamma;
145
146			interp_arr2(i,x,f):(i+1-x)f(i)+(x-i)f(i+1);
147			interp_arr(x,f):if(x-1,if(f(0)-x,interp_arr2(floor(x),x,f),f(f(0))),f(1));
148
149			def_redp(i):select(i,0.18848,0.05468174,
150			0.00103547,8.311144e-08,7.449763e-06,0.0004390987,0.001367254,
151			0.003076,0.01376382,0.06170773,0.1739422,0.2881156,0.3299725,
152			0.3552663,0.372552,0.3921184,0.4363976,0.6102754,0.7757267,
153			0.9087369,1,1,0.9863);
154			def_red(x):interp_arr(x/0.0454545+1,def_redp);
155
156			def_grnp(i):select(i,0.0009766,2.35501e-05,
157			0.0008966244,0.0264977,0.1256843,0.2865799,0.4247083,0.4739468,
158			0.4402732,0.3671876,0.2629843,0.1725325,0.1206819,0.07316644,
159			0.03761026,0.01612362,0.004773749,6.830967e-06,0.00803605,
160			0.1008085,0.3106831,0.6447838,0.9707);
161			def_grn(x):interp_arr(x/0.0454545+1,def_grnp);
162
163			def_blup(i):select(i,0.2666,0.3638662,0.4770437,
164			0.5131397,0.5363797,0.5193677,0.4085123,0.1702815,0.05314236,
165			0.05194055,0.08564082,0.09881395,0.08324373,0.06072902,
166			0.0391076,0.02315354,0.01284458,0.005184709,0.001691774,
167			2.432735e-05,1.212949e-05,0.006659406,0.02539);
168			def_blu(x):interp_arr(x/0.0454545+1,def_blup);
169
170			isconta = if(btwn(0,v,1),or(boundary(vleft,vright),boundary(vabove,vbelow)),-1);
171			iscontb = if(btwn(0,v,1),btwn(.4,frac(ndivs*v),.6),-1);
172
173			ra = 0;
174			ga = 0;
175			ba = 0;
176
177			in = 1;
178
179			ro = if(in,clip($redv),ra);
180			go = if(in,clip($grnv),ga);
181			bo = if(in,clip($bluv),ba);
182			EndOfPC0
183
184	greg	2.3	my $pc1 = "$td/pc1.cal";
185	greg	2.1	open(FHpc1, ">$pc1");
186			print FHpc1 <<EndOfPC1;
187			norm : mult/scale/le(1);
188
189			v = map(li(1)*norm);
190
191			vleft = map(li(1,-1,0)*norm);
192			vright = map(li(1,1,0)*norm);
193			vabove = map(li(1,0,1)*norm);
194			vbelow = map(li(1,0,-1)*norm);
195
196			map(x) = x;
197
198			ra = ri(nfiles);
199			ga = gi(nfiles);
200			ba = bi(nfiles);
201			EndOfPC1
202
203			my $pc0args = "-f $pc0";
204			my $pc1args = "-f $pc1";
205
206			# Contour lines or bands
207			if ($docont ne '') {
208			$pc0args .= " -e 'in=iscont$docont'";
209			}
210
211			if ($cpict eq '') {
212			$pc1args .= " -e 'ra=0;ga=0;ba=0'";
213			} elsif ($cpict eq $picture) {
214			$cpict = '';
215			}
216
217			# Logarithmic mapping
218			if ($decades > 0) {
219			$pc1args .= " -e 'map(x)=if(x-10^-$decades,log10(x)/$decades+1,0)'";
220			}
221
222			# Colours in the legend
223	greg	2.3	my $scolpic = "$td/scol.hdr";
224	greg	2.1	# Labels in the legend
225	greg	2.3	my $slabpic = "$td/slab.hdr";
226	greg	2.1	my $cmd;
227
228	greg	2.3	if (($legwidth > 20) && ($legheight > 40)) {
229	greg	2.5	# Legend: Create the text labels
230	greg	2.1	my $sheight = floor($legheight / $ndivs + 0.5);
231	greg	2.4	$legheight = $sheight * $ndivs;
232			$loff = floor($loff * $sheight + 0.5);
233	greg	2.1	my $text = "$label";
234	greg	2.3	for (my $i=0; $i<$ndivs; $i++) {
235	greg	2.1	my $imap = ($ndivs - 0.5 - $i) / $ndivs;
236	greg	2.5	my $value = $scale;
237	greg	2.1	if ($decades > 0) {
238	greg	2.3	$value = 10(($imap - 1) $decades);
239	greg	2.1	} else {
240	greg	2.3	$value *= $imap;
241	greg	2.1	}
242			# Have no more than 3 decimal places
243			$value =~ s/(\.[0-9]{3})[0-9]*/$1/;
244			$text .= "\n$value";
245			}
246			$cmd = "echo '$text' \| psign -s -.15 -cf 1 1 1 -cb 0 0 0";
247			$cmd .= " -h $sheight > $slabpic";
248			system $cmd;
249	greg	2.4
250	greg	2.5	# Legend: Create the background colours
251	greg	2.4	$cmd = "pcomb $pc0args -e 'v=(y+.5)/yres;vleft=v;vright=v'";
252			$cmd .= " -e 'vbelow=(y-.5)/yres;vabove=(y+1.5)/yres'";
253			$cmd .= " -x $legwidth -y $legheight > $scolpic";
254			system $cmd;
255	greg	2.1	} else {
256	greg	2.5	# Legend is too small to be legible. Don't bother doing one.
257	greg	2.1	$legwidth = 0;
258			$legheight = 0;
259	greg	2.4	$loff = 0;
260	greg	2.5	# Create dummy colour scale and legend labels so we don't
261			# need to change the final command line.
262	greg	2.1	open(FHscolpic, ">$scolpic");
263	greg	2.2	print FHscolpic "\n-Y 1 +X 1\naaa\n";
264	greg	2.1	close(FHscolpic);
265			open(FHslabpic, ">$slabpic");
266	greg	2.2	print FHslabpic "\n-Y 1 +X 1\naaa\n";
267	greg	2.1	close(FHslabpic);
268			}
269
270	greg	2.3	# Legend: Invert the text labels (for dropshadow)
271			my $slabinvpic = "$td/slabinv.hdr";
272			$cmd = "pcomb -e 'lo=1-gi(1)' $slabpic > $slabinvpic";
273			system $cmd;
274
275	greg	2.1	my $loff1 = $loff - 1;
276			# Command line without extrema
277			$cmd = "pcomb $pc0args $pc1args $picture $cpict";
278	greg	2.3	$cmd .= "\| pcompos $scolpic 0 0 +t .1 $slabinvpic 2 $loff1";
279	greg	2.1	$cmd .= " -t .5 $slabpic 0 $loff - $legwidth 0";
280
281			if ($doextrem == 1) {
282	greg	2.5	# Get min/max image luminance
283	greg	2.1	my $cmd1 = 'pextrem -o ' . $picture;
284			my $retval = `$cmd1`;
285			# e.g.
286			# x y r g b
287			# 193 207 3.070068e-02 3.118896e-02 1.995850e-02
288			# 211 202 1.292969e+00 1.308594e+00 1.300781e+00
289
290			my @extrema = split(/\s/, $retval);
291	greg	2.3	my ($lxmin, $ymin, $rmin, $gmin, $bmin, $lxmax, $ymax, $rmax, $gmax, $bmax) = @extrema;
292	greg	2.5	$lxmin += $legwidth;
293			$lxmax += $legwidth;
294	greg	2.1
295	greg	2.5	# Weighted average of R,G,B
296	greg	2.1	my $minpos = "$lxmin $ymin";
297			my $minval = ($rmin * .27 + $gmin * .67 + $bmin * .06) * $mult;
298			$minval =~ s/(\.[0-9]{3})[0-9]*/$1/;
299			my $maxpos = "$lxmax $ymax";
300			my $maxval = ($rmax * .27 + $gmax * .67 + $bmax * .06) * $mult;
301			$maxval =~ s/(\.[0-9]{3})[0-9]*/$1/;
302
303	greg	2.5	# Create the labels for min/max intensity
304	greg	2.3	my $minvpic = "$td/minv.hdr";
305	greg	2.1	$cmd1 = "psign -s -.15 -a 2 -h 16 $minval > $minvpic";
306			system $cmd1;
307	greg	2.3	my $maxvpic = "$td/maxv.hdr";
308	greg	2.1	$cmd1 = "psign -s -.15 -a 2 -h 16 $maxval > $maxvpic";
309			system $cmd1;
310
311	greg	2.5	# Add extrema labels to command line
312	greg	2.1	$cmd .= " $minvpic $minpos $maxvpic $maxpos";
313			}
314
315			# Process image and combine with legend
316			system "$cmd";
317
318			#EOF