....................................../////.===Shadow-Here===./////................................................ > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < ------------------------------------------------------------------------------------------------------------------- /////////////////////////////////////////////////////////////////////////////////////////////////////////////////// RIFF¤ WEBPVP8 ˜ ðÑ *ôô>‘HŸK¥¤"§£±¨àð enü¹%½_F‘åè¿2ºQú³íªú`N¿­3ÿƒügµJžaÿ¯ÿ°~¼ÎùnúîÞÖô•òíôÁÉß®Sm¥Ü/ ‡ó˜f£Ùà<˜„xëJ¢Ù€SO3x<ªÔ©4¿+ç¶A`q@Ì“Úñè™ÍÿJÌ´ª-˜ÆtÊÛL]Ïq*‘Ý”ì#ŸÌÏãY]@ê`¿ /ªfkØB4·®£ó z—Üw¥Pxù–ÞLШKÇN¾AkÙTf½è'‰g gÆv›Øuh~ a˜Z— ïj*á¥t d£“uÒ ¨`K˜¹ßþ]b>˜]_ÏÔ6W—è2r4x•íÖ…"ƒÖNîä!¦å Ú}ýxGøÌ —@ ;ÆÚŠ=ɾ1ý8lªË¥ô ^yf®Œ¢u&2©nÙÇ›ñÂñŒ³ aPo['½»øFùà­+4ê“$!lövlüÞ=;N®3ð‚õ›DÉKòÞ>ÄÍ ¥ˆuߤ#ˆ$6ù™¥îŠ‡y’ÍB¼ çxÛ;X"WL£R÷͝*ó-¶Zu}º.s¸sšXqù–DþÿvªhüïwyŸ ¯é³lÀ:KCûÄ£Ëá\…­ ~—ýóî ¼ûûÜTÓüÇy…ŽÆvc»¾×U ñ¸žþоP÷¦ó:Ò¨¨5;Ð#&#ÖúñläÿÁœ GxÉ­/ñ‡áQðìYÉtÒwŽ¼GÔ´zàÒò ð*ëzƒ•4~H]Ø‹f ñÓÈñ`NåWçs'ÆÏW^ø¹!XžµmQ5ÃËoLœÎ: ÞËÍ¥J ù…î èo£ßPÎñ¶ž8.Œ]ʵ~5›ÙË-ù*8ÙÖß±~ ©¹rÓê‚j¶d¸{^Q'˜±Crß ÚH—#¥¥QlÀ×ëã‡DÜ«èî þ&Çæžî;ŽÏºò6ÒLÃXy&ZŒ'j‚¢Ù€IßÚù+–MGi‰*jE€‘JcÜ ÓÌ EÏÚj]o˜ Þr <¾U ûŪæÍ/šÝH¥˜b”¼ ÁñßX GP›ï2›4WŠÏà×£…íÓk†¦H·ÅíMh–*nó÷à]ÁjCº€b7<ب‹¨5車bp2:Á[UªM„QŒçiNMa#<5›áËó¸HýÊ"…×Éw¹¦ì2º–x<›»a±¸3Weü®FÝ⑱ö–î–³|LPÈ~çð~Çå‡|º kD¢µÏàÆAI %1À% ¹Ò – ”ϝS¦‰4&¶£°à Öý”û_Ò Áw°A«Å€?mÇÛgHÉ/8)á¾ÛìáöŽP í¨PŸNÙµº¦‡§Ùš"ÿ«>+ªÕ`Ê÷‡‚ß Õû˜þãÇ-PÍ.¾XV‘€ dÜ"þ4¹ ±Oú‘©t¥¦FªÄÃÄ•b‚znýu½—#cDs˜ÃiÑOˆñ×QO=*IAÊ,¶ŽZƒ;‡wøXè%EÐk:F±Ú” .Ѽ+Áu&Ç`."pÈÉw o&¿dE6‘’EqTuK@Ì¥ã™À(Êk(h‰,H}RÀIXÛš3µ1©_OqÚÒJAñ$ÊÙÜ;D3çŒ[þùœh¬Ã³™ö6ç†NY".Ú‰ï[ªŸŒ '²Ð öø_¨ÂÉ9u鶳ÒŠõTàîMØ#û¯gN‡bÙ놚X„ö …ÉeüÌ^J ‹€.œ$Æ)βÄeæW#óüßĺŸ€ ÀzwV 9oä»f4V*uB «Ë†¹ì¯žR霓æHXa=&“I4K;¯ç‹h×·"UŠ~<•â•ªVêª&ÍSÃÆÅ?ÔqÎ*mTM ˜›µwêd#[C¡©§‘D<©àb†–ÁœøvH/,í:¯( ²£|4-„Æövv„Yͼ™^Á$ˆ„¢Û[6yB.åH*V¨æ?$=˜Ñ€•î¦ñ·­(VlŸ‘ nÀt8W÷´Bûba?q9ú¶Xƒl«ÿ\ù¶’þòUÐj/õ¢Ìµ³g$ƒÎR!¸»|Oߍë’BhîÚÑ¢ñåŒJ„®„£2Ð3•ô02Nt…!£Í]Ïc½Qÿ?ˆ<&ÃA¾Ú,JˆijÌ#5yz„‰Î|ÊŽ5QÏ:‹ÐaóVÔxW—CpeÏzÐïíçôÿÅ_[hãsÐ_/ŽTÝ?BîˆííV$<¿i>²F¬_Eß¿ †bÊŒº­ÿ®Z H“C}”¬,Mp ý/Bá£w>˜YV°aƒúh+cŠ- r/[%|üUMHäQ°X»|û/@|°¥Ð !BÔ Ç¢Ä©š+Õì D«7ìN¶ŽðÔ " ƶ’ÖçtA‰Û×}{tþz­¾GÍ›k¹OEJR$ Â׃ «ëÁ"oÉôž$oUK(Ä)Ãz³Ê-‹êN[Ò3Œñbï8P 4ƒ×q¢bo|?<ÛX¬òÄÍ°L–±›(™ûG?ýË©ÚÄ–ÂDØÐ_Ç¡ô ¾–ÄÏø ×e8Ë©$ÄF¹Å‹ì[©óìl:F¾f´‹‹Xì²ï®\¬ôùƒ ÿat¥óèÒùHß0äe‚;ü×h:ÆWðHž=Ã8骣"kœ'Y?³}Tûè€>?0l›e1Lòñ„aæKÆw…hÖŠùW…ÈÆÄ0ši·›[pcwËþñiêíY/~-Á5˜!¿†A›™Mÿþ(±“t@â“ö2­´TG5yé]çå僳 .·ÍïçÝ7UÚ±Ð/Nè»,_Ï ùdj7\ï Wì4›„»c¸àešg#ÒÊ⥭áØo5‘?ÌdÝô¯ ¹kzsƒ=´#ëÉK›Ø´±-¥eW?‡çßtòTã…$Ý+qÿ±ƒ÷_3Ô¥í÷:æ–ž<·Ö‡‰Å¢ š‡%Ô—utÌÈìðžgÖÀz²À—ï÷Óîäõ{K'´È÷³yaÏÁjƒô}ž§®æÊydÕÈë5¯èˆõvÕ©ã*çD„ “z„Ó‡^^xÂ3M§A´JG‚öï 3W'ˆ.OvXè¡ÊÕª?5º7†˜(˜Ç¶#çê’¶!ÌdZK§æ 0fãaN]òY³RV ™î$®K2R¨`W!1Ôó\;Ý ýB%qæK•&ÓÈe9È0êI±žeŸß -ú@žQr¦ ö4»M¼Áè¹µmw 9 EÆE_°2ó„ŸXKWÁ×Hóì^´²GѝF©óäR†¦‰ç"V»eØ<3ùd3ÿÚ¤Žú“Gi" —‘_ÙËÎ~Üö¯¥½Î»üŸEÚŽåmÞþí ;ÞólËΦMzA"Âf(´òá;Éï(/7½ûñÌ­cïÕçлþÝz¾-ÍvÑ“pH­–ðÓj$¸Äû¤‚‘ãUBË-n“2åPkS5&‹Â|+g^œ®Ì͆d!OïäîU«c;{Û!ÅŽ«ëZ9Ókóˆ]¯ƒ›né `ÇÒ+tÆš (ØKá¾—=3œ®•vuMñg²\ï Ec€ 05±d™‡×iÇ×›UúvÌ¢£Èþ¡ÕØô¶ßÎA"ß±#Ö²ˆÊŸ¦*Ä~ij|àø.-¼'»Ú¥£h ofº¦‡VsR=N½„Î v˜Z*SÌ{=jÑB‹tê…;’HžH¯8–îDù8ñ¢|Q•bÛçš–‹m³“ê¨ åÏ^m¬Žãþ©ïêO‡½6] µÆ„Ooòü ²x}N¦Ë3ïé¿»€›HA˜m%çÞ/¿í7Fø“‹léUk)É°Œµ8Q8›:ÀŠeT*šõ~ôڝG6 ¢}`ùH­–”¡k ‰P1>š†®9z11!X wKfmÁ¦xÑ,N1Q”–æB¶M…ÒÃv6SMˆhU¬ÊPŽï‘öj=·CŒ¯u¹ƒVIЃsx4’ömÛýc塶7ßŠß 57^\wÒÐÆ k§h,Œý î«q^R½3]J¸ÇðN ‚çU¬ôº^Áì} ³f©Õœ§ˆã:FÄÈ‚é(€™?àýÓüè1Gô£¼éj‚OÅñ  #>×—ßtà 0G¥Åa뀐kßhc™À_ÉñÞ#±)GD" YîäË-ÿÙ̪ ¹™a¯´¢E\ÝÒö‚;™„ë]_ p8‰o¡ñ+^÷ 3‘'dT4œŽ ðVë½° :¬víÑ«£tßÚS-3¶“þ2 †üüʨòrš¹M{É_¤`Û¨0ìjœøJ‡:÷ÃáZ˜†@GP&œÑDGÏs¡þ¦þDGú‘1Yá9Ôþ¼ ûø…§÷8&–ÜÑnÄ_m®^üÆ`;ÉVÁJ£?â€-ßê}suÍ2sõA NÌúA磸‘îÿÚ»ƒìö·á¿±tÑÐ"Tÿü˜[@/äj¬€uüªìù¥Ý˜á8Ý´sõj 8@rˆð äþZÇD®ÿUÏ2ùôõrBzÆÏÞž>Ì™xœ“ wiÎ×7_… ¸ \#€MɁV¶¥üÕÿPÔ9Z‡ø§É8#H:ƒ5ÀÝå9ÍIŒ5åKÙŠ÷qÄ>1AÈøžj"µÂд/ªnÀ qªã}"iŸBå˜ÓÛŽ¦…&ݧ;G@—³b¯“•"´4í¨ôM¨åñC‹ïùÉó¯ÓsSH2Ý@ßáM‡ˆKÀªÛUeø/4\gnm¥‹ŸŒ qÄ b9ÞwÒNÏ_4Ég³ú=܆‚´ •â¥õeíþkjz>éÚyU«Íӝ݃6"8/ø{=Ô¢»G¥ äUw°W«,ô—¿ãㆅү¢³xŠUû™yŒ (øSópÐ 9\åTâ»—*oG$/×ÍT†Y¿1¤Þ¢_‡ ¼ „±ÍçèSaÓ 3ÛMÁBkxs‰’R/¡¤ˆÙçª(*õ„üXÌ´ƒ E§´¬EF"Ù”R/ÐNyÆÂ^°?™6¡œïJ·±$§?º>ÖüœcNÌù¯G ‹ñ2ŠBB„^·úìaz¨k:#¨Æ¨8LÎõލ£^§S&cŒÐU€ü(‡F±Š¼&P>8ÙÁ ‰ p5?0ÊƃZl¸aô š¼¡}gÿ¶zÆC²¹¬ÎÖG*HB¡O<º2#ñŒAƒ–¡B˜´É$¥›É:FÀÔx¾u?XÜÏÓvN©RS{2ʈãk9rmP¼Qq̳ è¼ÐFׄ^¡Öì fE“F4A…!ì/…¦Lƒ… … $%´¾yã@CI¬ á—3PþBÏNÿ<ý°4Ü ËÃ#ØÍ~âW«rEñw‹eùMMHß²`¬Öó½íf³:‹k˜¯÷}Z!ã¿<¥,\#öµÀ¯aÒNÆIé,Ћ–lŽ#Àæ9ÀÒS·I’½-Ïp Äz¤Š Â* ­íÄ9­< h>׍3ZkËU¹§˜ŒŠ±f­’¤º³Q ÏB?‹#µíÃ¥®@(Gs«†vI¥Mµ‹Á©e~2ú³ÁP4ìÕi‚²Ê^ö@-DþÓàlÜOÍ]n"µã:žpsŽ¢:! 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Current File : /bin/ppmfade
#!/usr/bin/sh

##############################################################################
# This is essentially a Perl program.  We exec the Perl interpreter specifying
# this same file as the Perl program and use the -x option to cause the Perl
# interpreter to skip down to the Perl code.  The reason we do this instead of
# just making /usr/bin/perl the script interpreter (instead of /bin/sh) is
# that the user may have multiple Perl interpreters and the one he wants to
# use is properly located in the PATH.  The user's choice of Perl interpreter
# may be crucial, such as when the user also has a PERL5LIB environment
# variable and it selects modules that work with only a certain main
# interpreter program.
#
# An alternative some people use is to have /usr/bin/env as the script
# interpreter.  We don't do that because we think the existence and
# compatibility of /bin/sh is more reliable.
#
# Note that we aren't concerned about efficiency because the user who needs
# high efficiency can use directly the programs that this program invokes.
#
##############################################################################

exec perl -w -x -S -- "$0" "$@"

#!/usr/bin/perl
##############################################################################
#                                  ppmfade
##############################################################################
#
#  This program creates a fade (a sequence of frames) between two images.
#
#  By Bryan Henderson, Olympia WA; March 2000
#
#  Contributed to the public domain by its author.
#
#  Inspired by the program Pbmfade by Wesley C. Barris of AHPCRC,
#  Minnesota Supercomputer Center, Inc. January 7, 1994.  Pbmfade does
#  much the same thing, but handles non-Netpbm formats too, and is 
#  implemented in a more primitive language.
#
##############################################################################
use strict;
use File::Temp "tempdir";

sub doVersionHack($) {
    my ($argvR) = @_;

    my $arg1 = $argvR->[0];

    if (defined($arg1) && (($arg1 eq "--version") || ($arg1 eq "-version"))) {
        my $termStatus = system('ppmmix', '--version');
        exit($termStatus == 0 ? 0 : 1);
    }
}



my $SPREAD =  1;
my $SHIFT =   2;
my $RELIEF =  3;
my $OIL =     4;
my $EDGE =    5;
my $BENTLEY = 6;
my $BLOCK =   7;
my $MIX =     8;
#
#  Set some defaults.
#
my $nframes = 30;			# total number of files created (1 sec)
my $first_file = "undefined";
my $last_file = "undefined";
my $base_name = "fade";		# default base name of output files
my $image = "ppm";		# default output storage format
my $mode = $SPREAD;		# default fading mode

doVersionHack(\@ARGV);

my $n;  # argument number

for ($n = 0; $n < @ARGV; $n++) {
    if ("$ARGV[$n]" eq "-f") {
        $n++;
        $first_file = $ARGV[$n];
        if (-e $first_file) {
        } else {
            print "I can't find first file '$first_file'\n";
            exit 1;
        }
    } elsif ($ARGV[$n] eq "-l") {
        $n++;
        $last_file = $ARGV[$n];
        if (-e $last_file) {
        } else {
            print "I can't find last file '$last_file'\n";
            exit 1;
        }
    } elsif ($ARGV[$n] eq "-base") {
        $n++;
        $base_name = $ARGV[$n];
    } elsif ($ARGV[$n] eq "-spread") {
        $mode = $SPREAD;
    } elsif ($ARGV[$n] eq "-shift") {
        $mode = $SHIFT;
    } elsif ($ARGV[$n] eq "-relief") {
        $mode = $RELIEF;
    } elsif ($ARGV[$n] eq "-oil") {
        $mode = $OIL;
    } elsif ("$ARGV[$n]" eq "-edge") {
        $mode = $EDGE;
    } elsif ("$ARGV[$n]" eq "-bentley") {
        $mode = $BENTLEY;
    } elsif ("$ARGV[$n]" eq "-block") {
        $mode = $BLOCK;
    } elsif ("$ARGV[$n]" eq "-mix") {
        $mode = $MIX;
    } elsif ($ARGV[$n] eq "-help" || $ARGV[$n] eq "--help" || $ARGV[$n] eq "-h") {
        print "ppmfade: Use 'man ppmfade' for help.\n";
        exit 1;
    } else {
        print "Unknown argument: $ARGV[$n]\n";
        exit 1;
    } 
}
#
#  Define a couple linear ramps.
#
# We don't use element 0 of these arrays.
my @spline10 = (0, 0, 0.11, 0.22, 0.33, 0.44, 0.55, 0.66, 0.77, 0.88, 1.0);
my @spline20 = (0, 0, 0.05, 0.11, 0.16, 0.21, 0.26, 0.32, 0.37, 0.42, 0.47, 
                0.53, 0.58, 0.63, 0.69, 0.74, 0.79, 0.84, 0.89, 0.95, 1.0);
#
#  Just what are we supposed to do?
#
my ($height, $width);    # width and height of our frames
if ($first_file ne "undefined") {
    if ((`pnmfile $first_file` =~ m{\b(\d+)\sby\s(\d+)} )) { 
        $width = $1; $height = $2;
    } else {
        print("Unrecognized results from pnmfile on $first_file.\n");
        exit 1;
    }
} elsif ($last_file ne "undefined") {
    if ((`pnmfile $last_file` =~ m{\b(\d+)\sby\s(\d+)} )) { 
        $width = $1; $height = $2;
    } else {
        print("Unrecognized results from pnmfile on $first_file.\n");
        exit 1;
    }
} else {
    print("ppmfade:  You must specify -f or -l (or both)\n");
    exit 1;
}

print("Frames are " . $width . "W x " . $height . "H\n");

#
# We create a tmp-directory right here
#
my $tmpdir = tempdir("ppmfade.XXXXXX", CLEANUP => 1);


if ($first_file eq "undefined") {
    print "Fading from black to ";
    system("ppmmake \\#000 $width $height >$tmpdir/junk1$$.ppm");
} else {
    print "Fading from $first_file to ";
    system("cp", $first_file, "$tmpdir/junk1$$.ppm");
}

if ($last_file eq "undefined") {
    print "black.\n";
    system("ppmmake \\#000 $width $height >$tmpdir/junk2$$.ppm");
} else {
    print "$last_file\n";
    system("cp", $last_file, "$tmpdir/junk2$$.ppm");
}

#
#  Perform the fade.
#

# Here's what our temporary files are:
#   $tmpdir/junk1$$.ppm: The original (fade-from) image
#   $tmpdir/junk2$$.ppm: The target (fade-from) image
#   $tmpdir/junk3$$.ppm: The frame of the fade for the current iteration of the 
#                	 the for loop.
#   $tmpdir/junk1a$$.ppm: If the fade involves a ppmmix sequence from one intermediate
#                         image to another, this is the first frame of that 
#                         sequence.
#   $tmpdir/junk2a$$.ppm: This is the last frame of the above-mentioned ppmmix sequence

my $i;    # Frame number
for ($i = 1; $i <= $nframes; $i++) {
    print("Creating $i of $nframes...\n");
    if ($mode eq $SPREAD) {
        if ($i <= 10) {
            my $n = $spline20[$i] * 100;
            system("ppmspread $n $tmpdir/junk1$$.ppm >$tmpdir/junk3$$.ppm");
        } elsif ($i <= 20) {
            my $n;
            $n = $spline20[$i] * 100;
            system("ppmspread $n $tmpdir/junk1$$.ppm >$tmpdir/junk1a$$.ppm");
            $n = (1-$spline20[$i-10]) * 100;
            system("ppmspread $n $tmpdir/junk2$$.ppm >$tmpdir/junk2a$$.ppm");
            $n = $spline10[$i-10];
            system("ppmmix $n $tmpdir/junk1a$$.ppm $tmpdir/junk2a$$.ppm >$tmpdir/junk3$$.ppm");
        } else {
            my $n = (1-$spline20[$i-10])*100;
            system("ppmspread $n $tmpdir/junk2$$.ppm >$tmpdir/junk3$$.ppm");
        }
    } elsif ($mode eq $SHIFT) {
        if ($i <= 10) {
            my $n = $spline20[$i] * 100;
            system("ppmshift $n $tmpdir/junk1$$.ppm >$tmpdir/junk3$$.ppm");
        } elsif ($i <= 20) {
            my $n;
            $n = $spline20[$i] * 100;
            system("ppmshift $n $tmpdir/junk1$$.ppm >$tmpdir/junk1a$$.ppm");
            $n = (1-$spline20[$i-10])*100;
            system("ppmshift $n $tmpdir/junk2$$.ppm >$tmpdir/junk2a$$.ppm");
            $n = $spline10[$i-10];
            system("ppmmix $n $tmpdir/junk1a$$.ppm $tmpdir/junk2a$$.ppm >$tmpdir/junk3$$.ppm");
        } else {
            my $n = (1-$spline20[$i-10]) * 100;
            system("ppmshift $n $tmpdir/junk2$$.ppm >$tmpdir/junk3$$.ppm");
        }
    } elsif ($mode eq $RELIEF) {
        if ($i == 1) {
            system("ppmrelief $tmpdir/junk1$$.ppm >$tmpdir/junk1r$$.ppm");
        }
        if ($i <= 10) {
            my $n = $spline10[$i];
            system("ppmmix $n $tmpdir/junk1$$.ppm $tmpdir/junk1r$$.ppm >$tmpdir/junk3$$.ppm");
        } elsif ($i <= 20) {
            my $n = $spline10[$i-10];
            system("ppmmix $n $tmpdir/junk1r$$.ppm $tmpdir/junk2r$$.ppm >$tmpdir/junk3$$.ppm");
        } else {
            my $n = $spline10[$i-20];
            system("ppmmix $n $tmpdir/junk2r$$.ppm $tmpdir/junk2$$.ppm >$tmpdir/junk3$$.ppm");
        }
        if ($i == 10) {
            system("ppmrelief $tmpdir/junk2$$.ppm >$tmpdir/junk2r$$.ppm");
        }
    } elsif ($mode eq $OIL) {
        if ($i == 1) {
            system("ppmtopgm $tmpdir/junk1$$.ppm | pgmoil >$tmpdir/junko$$.ppm");
            system("rgb3toppm $tmpdir/junko$$.ppm $tmpdir/junko$$.ppm $tmpdir/junko$$.ppm " .
                   ">$tmpdir/junk1o$$.ppm");
        }
        if ($i <= 10) {
            my $n = $spline10[$i];
            system("ppmmix $n $tmpdir/junk1$$.ppm $tmpdir/junk1o$$.ppm >$tmpdir/junk3$$.ppm");
        } elsif ($i <= 20) {
            my $n = $spline10[$i-10];
            system("ppmmix $n $tmpdir/junk1o$$.ppm $tmpdir/junk2o$$.ppm >$tmpdir/junk3$$.ppm");
        } else {
            my $n = $spline10[$i-20];
            system("ppmmix $n $tmpdir/junk2o$$.ppm $tmpdir/junk2$$.ppm >$tmpdir/junk3$$.ppm");
        }
        if ($i == 10) {
            system("ppmtopgm $tmpdir/junk2$$.ppm | pgmoil >$tmpdir/junko$$.ppm");
            system("rgb3toppm $tmpdir/junko$$.ppm $tmpdir/junko$$.ppm $tmpdir/junko$$.ppm " .
                   ">$tmpdir/junk2o$$.ppm");
        }
    } elsif ($mode eq $EDGE) {
        if ($i == 1) {
            system("ppmtopgm $tmpdir/junk1$$.ppm | pgmedge >$tmpdir/junko$$.ppm");
            system("rgb3toppm $tmpdir/junko$$.ppm $tmpdir/junko$$.ppm $tmpdir/junko$$.ppm " .
                   ">$tmpdir/junk1o$$.ppm");
        }
        if ($i <= 10) {
            my $n = $spline10[$i];
            system("ppmmix $n $tmpdir/junk1$$.ppm $tmpdir/junk1o$$.ppm >$tmpdir/junk3$$.ppm");
        } elsif ($i <= 20) {
            my $n = $spline10[$i-10];
            system("ppmmix $n $tmpdir/junk1o$$.ppm $tmpdir/junk2o$$.ppm >$tmpdir/junk3$$.ppm");
        } else {
            my $n = $spline10[$i-20];
            system("ppmmix $n $tmpdir/junk2o$$.ppm $tmpdir/junk2$$.ppm >$tmpdir/junk3$$.ppm");
        }
        if ($i == 10) {
            system("ppmtopgm $tmpdir/junk2$$.ppm | pgmedge >$tmpdir/junko$$.ppm");
            system("rgb3toppm $tmpdir/junko$$.ppm $tmpdir/junko$$.ppm $tmpdir/junko$$.ppm " .
                   ">$tmpdir/junk2o$$.ppm");
        } 
    } elsif ($mode eq $BENTLEY) {
        if ($i == 1) {
            system("ppmtopgm $tmpdir/junk1$$.ppm | pgmbentley >$tmpdir/junko$$.ppm");
            system("rgb3toppm $tmpdir/junko$$.ppm $tmpdir/junko$$.ppm $tmpdir/junko$$.ppm " .
                   ">$tmpdir/junk1o$$.ppm");
        }
        if ($i <= 10) {
            my $n = $spline10[$i];
            system("ppmmix $n $tmpdir/junk1$$.ppm $tmpdir/junk1o$$.ppm >$tmpdir/junk3$$.ppm");
        } elsif ($i <= 20) {
            my $n = $spline10[$i-10];
            system("ppmmix $n $tmpdir/junk1o$$.ppm $tmpdir/junk2o$$.ppm >$tmpdir/junk3$$.ppm");
        } else {
            my $n = $spline10[$i-20];
            system("ppmmix $n $tmpdir/junk2o$$.ppm $tmpdir/junk2$$.ppm >$tmpdir/junk3$$.ppm");
        }
        if ($i == 10) {
            system("ppmtopgm $tmpdir/junk2$$.ppm | pgmbentley >$tmpdir/junko$$.ppm");
            system("rgb3toppm $tmpdir/junko$$.ppm $tmpdir/junko$$.ppm $tmpdir/junko$$.ppm " .
                   ">$tmpdir/junk2o$$.ppm");
        }
    } elsif ($mode eq $BLOCK) {
        if ($i <= 10) {
            my $n = 1 - 1.9*$spline20[$i];
            system("pamscale $n $tmpdir/junk1$$.ppm | " .
                   "pamscale -width $width -height $height >$tmpdir/junk3$$.ppm");
        } elsif ($i <= 20) {
            my $n = $spline10[$i-10];
            system("ppmmix $n $tmpdir/junk1a$$.ppm $tmpdir/junk2a$$.ppm >$tmpdir/junk3$$.ppm");
        } else {
            my $n = 1 - 1.9*$spline20[31-$i];
            system("pamscale $n $tmpdir/junk2$$.ppm | " .
                   "pamscale -width $width -height $height >$tmpdir/junk3$$.ppm");
        }
        if ($i == 10) {
            system("cp", "$tmpdir/junk3$$.ppm", "$tmpdir/junk1a$$.ppm");
            system("pamscale $n $tmpdir/junk2$$.ppm | " .
                   "pamscale -width $width -height $height >$tmpdir/junk2a$$.ppm");
        }    
    } elsif ($mode eq $MIX) {
        my $fade_factor = sqrt(1/($nframes-$i+1));
        system("ppmmix $fade_factor $tmpdir/junk1$$.ppm $tmpdir/junk2$$.ppm >$tmpdir/junk3$$.ppm");
    } else {
        print("Internal error: impossible mode value '$mode'\n");
    }

    my $outfile = sprintf("%s.%04d.ppm", $base_name, $i);
    system("cp", "$tmpdir/junk3$$.ppm", $outfile);
}

#
#  Clean up shop.
#
system("rm $tmpdir/junk*$$.ppm");

exit(0);

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