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added GPL

#!/usr/bin/perl

#  Copyright (C) 2003,2004 Robert Casties, IT-Group MPIWG
# 
#  This program is free software; you can redistribute it and/or modify it
#  under the terms of the GNU General Public License as published by the Free
#  Software Foundation; either version 2 of the License, or (at your option)
#  any later version.
# 
#  Please read license.txt for the full details. A copy of the GPL may be found
#  at http://www.gnu.org/copyleft/lgpl.html
# 
#  You should have received a copy of the GNU General Public License along with
#  this program; if not, write to the Free Software Foundation, Inc., 59 Temple
#  Place, Suite 330, Boston, MA 02111-1307 USA

use strict;

# MPIWG libraries
use lib '/usr/local/mpiwg/scripts';
use MPIWGlib;


$| = 1; # unblock IO

my $version = "V0.9.2 (ROC 22.4.2004)";

$debug = 0;

my $simulate = 0;

my $do_descend = 1;

my $dir_perm = 0775;
my $file_perm = 0664;

umask 000; # to make shure we can actually use these perms

my $overwrite = 0; # overwrite already converted files

# image file extensions and formats
my %img_type_ext = ("tif" => "TIFF", "tiff" => "TIFF", "gif" => "GIF", 
		"jpg" => "JPEG", "png" => "PNG");
# destination image file extensions
my %target_ext_type = ("TIFF" => "jpg", "JPEG" => "jpg");

# default scale settings
my $scalesize = 2048; # pixel of longest side
my $scale_relative = 0; # scale by relative factor instead of destination size
my $jpeg_quality = 75; # default JPEG compression quality
my $use_encoder = 0; # autodetect encoder

# programs to use
my $identifier;
my $tiffinfo;
my $jpegloader;
my $tiffloader;
my $quantizer;
my $scaler;
my $jpegwriter;
my $pngwriter;
my $converter;

##########################################################################
# subroutines
#

#
# checksoft()
#
# returns if all necessary external programs are installed
#
sub checksoft {

    my @softdirs = ("/usr/X11R6/bin", "/usr/bin", "/usr/local/bin");

    $identifier = findfile(\@softdirs, "identify")
	or die("ABORT: neccessary external program not found: identify");
    $tiffinfo = findfile(\@softdirs, "tiffinfo")
	or die("ABORT: neccessary external program not found: tiffinfo");
    $jpegloader = findfile(\@softdirs, "jpegtopnm")
	or die("ABORT: neccessary external program not found: jpegtopnm");
    $tiffloader = findfile(\@softdirs, "tifftopnm")
	or die("ABORT: neccessary external program not found: tifftopnm");
    $quantizer = findfile(\@softdirs, "pbmtopgm")
	or die("ABORT: neccessary external program not found: pbmtopgm");
    $scaler = findfile(\@softdirs, "pnmscale")
	or die("ABORT: neccessary external program not found: pnmscale");
    $jpegwriter = findfile(\@softdirs, "ppmtojpeg")
	or die("ABORT: neccessary external program not found: ppmtojpeg");
    $pngwriter = findfile(\@softdirs, "pnmtopng")
	or die("ABORT: neccessary external program not found: pnmtopng");
    $converter = findfile(\@softdirs, "convert")
	or die("ABORT: neccessary external program not found: convert");

}



#
# findir(\@basedirs, $subdir)
#
# check directories in @basedirs+$subdir and return the first existing basedir
#
sub findir {
    my($dirlist, $subdir) = @_;

    foreach my $dir (@$dirlist) {
	if (-d "$dir/$subdir") {
	    return "$dir";
	}
    }
    return;
}

#
# findfile(\@basedirs, $filename)
#
# check @basedirs+$filename and return the first existing file
#
sub findfile {
    my($dirlist, $fn) = @_;

    foreach my $dir (@$dirlist) {
	if (-f "$dir/$fn") {
	    return "$dir/$fn";
	}
    }
    return;
}


#
# ($basename, $extension) = splitfn($filename)
#
# split filename into base and (lowercase) extension
#
sub splitfn {
    my ($filepath) = @_;
    if ($filepath =~ /^(.*)\.(\w+)$/) {
	return ($1, lc($2));
    }
    return;
}


#
# mmkdir($dirname)
#
# create directory recursively and check permissions
#
sub mmkdir {
    my($dirname) = @_;
    my $newdir;

    # does the directory already exist?
    if (-d $dirname) {
	chmod $dir_perm, $dirname or do {
	    logger('ERROR', "unable to change permission on $dirname!");
	    return 0;
	};
	return 1;
    }
    # split directory name by levels
    my @dirlist = split /\//, $dirname;
    my @newlist = ();
    my $dir = join("/", @dirlist);
    # test backwards which directories exist
    while (not -d $dir) {
	last unless ($dir);
	# move missing elements from the end of @dirlist to @newlist
	unshift @newlist, pop @dirlist;
	$dir = join("/", @dirlist);
    }
    # create missing directories level by level
    foreach $newdir (@newlist) {
	push @dirlist, $newdir;
	$dir = join("/", @dirlist);
	mkdir "$dir", $dir_perm or do {
	    logger('ERROR', "unable to create $dir!");
	    return 0;
	}
    }
    return 1;
}

#
# ($type, $width, $height) = identify($filepath)
#
sub identify {
    my ($filepath) = @_;
    my $pictype;
    my $picwidth;
    my $picheight;
    my $bitdepth = 0;
    # use quickident first
    $pictype = quickident($filepath);
    # optimize tiff identification
    if (($pictype)&&($pictype eq 'TIFF')) {
	logger('DEBUG', "running tiffinfo $tiffinfo");
	if (open(IDENT, "nice -10 $tiffinfo '$filepath' 2>/dev/null |")) {
	    while (<IDENT>) {
		chomp;
		if (/Image Width:\s*(\d+)\s*Image Length:\s*(\d+)/) {
		    $picwidth = $1;
		    $picheight = $2;
		    next;
		}
		if (/Bits\/Sample:\s*(\d+)/) {
		    $bitdepth = $1;
		    next;
		}
	    }
	    if ($picwidth) {
		logger('DEBUG', "TIFF $1 x $2");
		return ($pictype, $picwidth, $picheight, $bitdepth);
	    }
	}
    }
    # run ident to get image type and dimensions
    logger('DEBUG', "running identifier $identifier");
    if (open(IDENT, "nice -10 $identifier -ping -format '%w %h %m\n' '$filepath' 2>/dev/null |")) {
	my @id = <IDENT>;
	my $picinfo = $id[0];
	close IDENT;
	chomp $picinfo;
	logger('DEBUG', "PIC is '$picinfo'");
	if ($picinfo =~ /^(\d+) (\d+) (\w+)$/) {
	    $picwidth = $1;
	    $picheight = $2;
	    $pictype = $3;
	}
    } else {
	logger('DEBUG', "unable to identify $filepath!");
    }
    return ($pictype, $picwidth, $picheight, $bitdepth);
}

#
# $type = quickident($filepath);
#
sub quickident {
    my ($filepath) = @_;
    logger('DEBUG', "running quickident");
    # look at file extension
    my ($filebase, $fileext) = splitfn($filepath);
    if ($fileext) {
	return $img_type_ext{$fileext};
    }
    return;
}


#
# $error = scale_jpeg(\$args);
#
# scale JPEG images to JPEG using netpbm tools
#
# args needed: $srcdir, $filename, $destdir, 
#              $scalesize, $scale_rel, $picwidth, $picheight
#
sub scale_jpeg {
    my ($args) = @_;

    my $srcdir = $$args{'srcdir'};
    my $filename = $$args{'filename'};
    my $destdir = $$args{'destdir'};
    my $scalesize = $$args{'scalesize'};
    my $scale_rel = $$args{'scale_rel'};
    my $scaleopt;

    # convert jpg -> jpg
    my ($basename, $fileext) = splitfn($filename);
    my $newfn = $basename . ".jpg";
    logger('INFO', "Convert(jpg): $filename -> $newfn");
    return 1 if ($simulate);

    if ($scale_rel) {
	# scale relative -- no size needed, only scaling factor
	$scaleopt = $scalesize;
    } else {
	# scale to size -- size needed
	my $pictype = $$args{'pictype'};
	my $picwidth = $$args{'picwidth'};
	my $picheight = $$args{'picheight'};
	if (! $picwidth) {
	    ($pictype, $picwidth, $picheight) = identify("$srcdir/$filename");
	    if ((! $pictype)||($picwidth == 0)||($picheight == 0)) {
		logger('ERROR', "unable to identify $srcdir/$filename!");
		return 1;
	    }
	}
	if ($picheight > $picwidth) {
	    $scaleopt = $scalesize / $picheight;
	    logger('DEBUG', "PIC is portrait");
	} else {
	    $scaleopt = $scalesize / $picwidth;
	    logger('DEBUG', "PIC is landscape");
	}
	if ($scaleopt >= 1) {
	    $scaleopt = 1;
	    logger('DEBUG', "PIC is already smaller");
	}
    }

    if (!$scaleopt) {
	logger('ERROR', "unable to calculate scaling options!");
	return 1;
    }

    # convert
    logger('DEBUG', "nice -10 $jpegloader '$srcdir/$filename' 2>/dev/null | nice -10 $scaler $scaleopt 2>/dev/null | nice -10 $jpegwriter > '$destdir/$newfn' 2>/dev/null");
    return 0 if ($simulate);
    if (system("nice -10 $jpegloader '$srcdir/$filename' 2>/dev/null | nice -10 $scaler $scaleopt 2>/dev/null | nice -10 $jpegwriter > '$destdir/$newfn' 2>/dev/null") != 0) {
	logger('ERROR', "error converting '$srcdir/$filename'!");
	unlink "$destdir/$newfn";
	return 1;
    }

    # change permissions
    chmod $file_perm, "$destdir/$newfn" or
	logger('WARNING', "unable to set permission on '$destdir/$newfn'");

    if (! -s "$destdir/$newfn") {
	# file broken (size 0)
	logger('ERROR', "created file '$destdir/$newfn' broken -- will be removed!");
	unlink "$destdir/$newfn";
	return 1;
    }
    return 0;
}


#
# $error = scale_tiff_jpeg2(\$args);
#
# scale TIFF images to JPEG using ImageMagick convert
#
# args needed: $srcdir, $filename, $destdir, 
#              $scalesize, $scale_rel, $picwidth, $picheight
#
sub scale_tiff_jpeg2 {
    my ($args) = @_;

    my $srcdir = $$args{'srcdir'};
    my $filename = $$args{'filename'};
    my $destdir = $$args{'destdir'};
    my $scalesize = $$args{'scalesize'};
    my $scale_rel = $$args{'scale_rel'};
    my $scaleopt;

    my ($basename, $fileext) = splitfn($filename);
    my $newfn = $basename . ".jpg";
    logger('INFO', "Convert(tiff2): $filename -> $newfn");
    return 1 if ($simulate);

    if ($scale_rel) {
	# scale relative -- no size needed, only scaling factor
	$scaleopt = $scalesize;
    } else {
	# scale to size -- size needed
	my $pictype = $$args{'pictype'};
	my $picwidth = $$args{'picwidth'};
	my $picheight = $$args{'picheight'};
	if (! $picwidth) {
	    ($pictype, $picwidth, $picheight) = identify("$srcdir/$filename");
	    if ((! $pictype)||($picwidth == 0)||($picheight == 0)) {
		logger('ERROR', "unable to identify $srcdir/$filename!");
		return 1;
	    }
	}
	if ($picheight > $picwidth) {
	    $scaleopt = $scalesize / $picheight;
	    logger('DEBUG', "PIC is portrait");
	} else {
	    $scaleopt = $scalesize / $picwidth;
	    logger('DEBUG', "PIC is landscape");
	}
	if ($scaleopt >= 1) {
	    $scaleopt = 1;
	    logger('DEBUG', "PIC is already smaller");
	}
    }

    if (!$scaleopt) {
	logger('ERROR', "unable to calculate scaling options!");
	return 1;
    }

    if ($scale_rel) {
	my $per_scale = 100 * $scaleopt;
	logger('DEBUG', "nice -10 $converter -quality $jpeg_quality -scale $per_scale\% '$srcdir/$filename' '$destdir/$newfn' 2>/dev/null");
	return 0 if ($simulate);
	if (system("nice -10 $converter -quality $jpeg_quality -scale $per_scale\% '$srcdir/$filename' '$destdir/$newfn' 2>/dev/null\n") != 0) {
	    logger('ERROR', "error converting '$srcdir/$filename'!");
	    return 1;
	}
    } else {
	logger('DEBUG', "nice -10 $converter -quality $jpeg_quality -scale ${scalesize}x${scalesize} '$srcdir/$filename' '$destdir/$newfn' 2>/dev/null");
	return 0 if ($simulate);
	if (system("nice -10 $converter -quality $jpeg_quality -scale ${scalesize}x${scalesize} '$srcdir/$filename' '$destdir/$newfn' 2>/dev/null\n") != 0) {
	    logger('ERROR', "error converting '$srcdir/$filename'!");
	    return 1;
	}
    }

    # change permissions
    chmod $file_perm, "$destdir/$newfn" or
	logger('WARNING', "unable to set permission on '$destdir/$newfn'");

    if (! -s "$destdir/$newfn") {
	# file broken (size 0)
	logger('ERROR', "created file '$destdir/$newfn' broken -- will be removed!");
	unlink "$destdir/$newfn";
	return 1;
    }
    return 0;
}


#
# $error = scale_tiff_jpeg(\$args);
#
# scale TIFF images to JPEG using netpbm tools
#
# args needed: $srcdir, $filename, $destdir, 
#              $scalesize, $scale_rel, $picwidth, $picheight
#
sub scale_tiff_jpeg {
    my ($args) = @_;

    my $srcdir = $$args{'srcdir'};
    my $filename = $$args{'filename'};
    my $destdir = $$args{'destdir'};
    my $scalesize = $$args{'scalesize'};
    my $scale_rel = $$args{'scale_rel'};
    my $scaleopt;

    # convert jpg -> jpg
    my ($basename, $fileext) = splitfn($filename);
    my $newfn = $basename . ".jpg";
    logger('INFO', "Convert(tiff1): $filename -> $newfn");
    return 1 if ($simulate);

    if ($scale_rel) {
	# scale relative -- no size needed, only scaling factor
	$scaleopt = $scalesize;
    } else {
	# scale to size -- size needed
	my $pictype = $$args{'pictype'};
	my $picwidth = $$args{'picwidth'};
	my $picheight = $$args{'picheight'};
	if (! $picwidth) {
	    ($pictype, $picwidth, $picheight) = identify("$srcdir/$filename");
	    if ((! $pictype)||($picwidth == 0)||($picheight == 0)) {
		logger('ERROR', "unable to identify $srcdir/$filename!");
		return 1;
	    }
	}
	if ($picheight > $picwidth) {
	    $scaleopt = $scalesize / $picheight;
	    logger('DEBUG', "PIC is portrait");
	} else {
	    $scaleopt = $scalesize / $picwidth;
	    logger('DEBUG', "PIC is landscape");
	}
	if ($scaleopt >= 1) {
	    $scaleopt = 1;
	    logger('DEBUG', "PIC is already smaller");
	}
    }

    if (!$scaleopt) {
	logger('ERROR', "unable to calculate scaling options!");
	return 1;
    }

    # convert
    logger('DEBUG', "nice -10 $tiffloader '$srcdir/$filename' 2>/dev/null | nice -10 $scaler $scaleopt 2>/dev/null | nice -10 $jpegwriter --quality $jpeg_quality > '$destdir/$newfn' 2>/dev/null");
    return 0 if ($simulate);
    if (system("nice -10 $tiffloader '$srcdir/$filename' 2>/dev/null | nice -10 $scaler $scaleopt 2>/dev/null | nice -10 $jpegwriter --quality $jpeg_quality > '$destdir/$newfn' 2>/dev/null") != 0) {
	logger('ERROR', "error converting '$srcdir/$filename'!");
	unlink "$destdir/$newfn";
	return 1;
    }

    # change permissions
    chmod $file_perm, "$destdir/$newfn" or
	logger('WARNING', "unable to set permission on '$destdir/$newfn'");

    if (! -s "$destdir/$newfn") {
	# file broken (size 0)
	logger('ERROR', "created file '$destdir/$newfn' broken -- will be removed!");
	unlink "$destdir/$newfn";
	return 1;
    }
    return 0;
}



#
# $error = scale_tiff_png(\$args);
#
# scale TIFF images to PNG using netpbm tools
#
# args needed: $srcdir, $filename, $destdir, 
#              $scalesize, $scale_rel, $picwidth, $picheight
#
sub scale_tiff_png {
    my ($args) = @_;

    my $srcdir = $$args{'srcdir'};
    my $filename = $$args{'filename'};
    my $destdir = $$args{'destdir'};
    my $scalesize = $$args{'scalesize'};
    my $bitdepth = $$args{'bitdepth'};
    my $scale_rel = $$args{'scale_rel'};
    my $scaleopt;

    # convert jpg -> jpg
    my ($basename, $fileext) = splitfn($filename);
    my $newfn = $basename . ".png";
    logger('INFO', "Convert(tiff3): $filename -> $newfn");

    if ($scale_rel) {
	# scale relative -- no size needed, only scaling factor
	$scaleopt = $scalesize;
    } else {
	# scale to size -- size needed
	my $pictype = $$args{'pictype'};
	my $picwidth = $$args{'picwidth'};
	my $picheight = $$args{'picheight'};
	if (! $picwidth) {
	    ($pictype, $picwidth, $picheight, $bitdepth) = identify("$srcdir/$filename");
	    if ((! $pictype)||($picwidth == 0)||($picheight == 0)) {
		logger('ERROR', "unable to identify $srcdir/$filename!");
		return 1;
	    }
	}
	if ($picheight > $picwidth) {
	    $scaleopt = $scalesize / $picheight;
	    logger('DEBUG', "PIC is portrait");
	} else {
	    $scaleopt = $scalesize / $picwidth;
	    logger('DEBUG', "PIC is landscape");
	}
	if ($scaleopt >= 1) {
	    $scaleopt = 1;
	    logger('DEBUG', "PIC is already smaller");
	}
    }

    if (!$scaleopt) {
	logger('ERROR', "unable to calculate scaling options!");
	return 1;
    }

    # convert
    my $cmd = "nice -10 $tiffloader \'$srcdir/$filename\' 2>/dev/null ";
    if ($bitdepth == 1) {
	# antialiasing bilevel images
	$cmd .= "| nice -10 $quantizer 2 2 2>/dev/null ";
    }
    $cmd .= "| nice -10 $scaler $scaleopt 2>/dev/null | nice -10 $pngwriter > '$destdir/$newfn' 2>/dev/null";
    logger('DEBUG', "$cmd");
    return 0 if ($simulate);
    if (system($cmd) != 0) {
	logger('ERROR', "error converting '$srcdir/$filename'!");
	unlink "$destdir/$newfn";
	return 1;
    }

    # change permissions
    chmod $file_perm, "$destdir/$newfn" or
	logger('WARNING', "unable to set permission on '$destdir/$newfn'");

    if (! -s "$destdir/$newfn") {
	# file broken (size 0)
	logger('ERROR', "created file '$destdir/$newfn' broken -- will be removed!");
	unlink "$destdir/$newfn";
	return 1;
    }
    return 0;
}


#
# $error = convert_file($srcdir, $filename, $destdir);
#
# convert file
#
sub convert_file {
    my($srcdir, $filename, $destdir) = @_;
    my $filebase;
    my $fileext;
    my $newfn;
    my $pictype;
    my $picwidth;
    my $picheight;
    my $bitdepth;
    my $error = 0;
 
    logger('DEBUG', "convert_file ($srcdir, $filename, $destdir)");

    if (not (( -f "$srcdir/$filename") && (-r _))) {
	logger('ERROR', "unable to read file '$srcdir/$filename'");
	return 1;
    }

    # get base name and extension
    if ($filename =~ /^(.*)\.(\w+)$/) {
	$filebase = $1;
	$fileext = $2;
    }

    #
    # quick check if target image exists
    #
    $pictype = quickident("$srcdir/$filename");
    if ($pictype) {
	my $newext = $target_ext_type{$pictype};
	if ($newext) {
	    $newfn = $filebase . ".$newext";
	    # check if file exists
	    if (-f "$destdir/$newfn") {
		logger('DEBUG', "CONV file exists: $newfn");
		if (! $overwrite) {
		    logger('INFO', "File already converted: $newfn");
		    return 0;
		}
	    }
	} else {
	    logger('DEBUG', "target extension for $pictype unknown!");
	}
    } else {
	# quick ident failed -- do it slowly

	($pictype, $picwidth, $picheight, $bitdepth) = identify("$srcdir/$filename");
	if ((! $pictype)||($picwidth == 0)||($picheight == 0)) {
	    logger('WARNING', "unknown file type '$srcdir/$filename'");
	    return 0;
	}
    }

    # collect arguments for the conversion
    my %args;
    $args{'srcdir'} = $srcdir;
    $args{'destdir'} = $destdir;
    $args{'filename'} = $filename;
    $args{'pictype'} = $pictype;
    $args{'picwidth'} = $picwidth;
    $args{'picheight'} = $picheight;
    $args{'bitdepth'} = $bitdepth;
    $args{'srcdir'} = $srcdir;
    $args{'scalesize'} = $scalesize;
    $args{'scale_rel'} = $scale_relative;

    # decide conversion based on image type and encoding preferences
    if ($pictype eq 'JPEG') {
	$args{'jpeg_qual'} = $jpeg_quality;
	#default encoder
	$error = scale_jpeg(\%args);
    } elsif ($pictype eq 'TIFF') {
	if ($use_encoder) {
	    # use specific encoder
	    if ($use_encoder eq 'tiff_jpeg') {
		$error = scale_tiff_jpeg(\%args);
	    } elsif ($use_encoder eq 'tiff_jpeg2') {
		$error = scale_tiff_jpeg2(\%args);
	    } elsif ($use_encoder eq 'tiff_png') {
		$error = scale_tiff_png(\%args);
	    }
	} else {
	    # default
	    $error = scale_tiff_jpeg(\%args);
	}
    } else {
	logger('WARNING', "unknown file type: $pictype ($srcdir/$filename)");
    }
    return $error;
}


#
# walk_convert_dir($dirname)
#
# Descend recursively through $dirname and work on all files
#
sub walk_convert_dir {
    my($srcdir, $workdir, $destdir) = @_;
    my $errcnt = 0;
    my $newfn;

    opendir WORKDIR, "$srcdir/$workdir" or do {
	logger('ERROR', "Unable to open directory $srcdir/$workdir!");
	return 0;
    };

    my @dirlist = readdir(WORKDIR);

    closedir WORKDIR;

    if ($do_descend) {
	foreach (sort @dirlist) {
	    next if (/^[.]+$/);
	    next if ($junk_files{$_});
	    if (-d "$srcdir/$workdir/$_") {
		walk_convert_dir($srcdir, "$workdir/$_", $destdir);
	    }
	}
    }

    logger('INFO', "Working on $workdir");
    logger('INFO', "Reading from $srcdir/$workdir.");
    logger('INFO', "Writing to $destdir/$workdir");

    # create destination directory
    if (not ($simulate)) {
	mmkdir("$destdir/$workdir") or do {
	    logger("ERROR", "unable to create directory '$destdir/$workdir'");
	    $errcnt++;
	    return 0;
	};
    }

    foreach (sort @dirlist) {
	# skip dot-directories
	if (/^[.]+.*$/) {
	    next;
	}
	if (-f "$srcdir/$workdir/$_") {
	    $errcnt += convert_file("$srcdir/$workdir", "$_", "$destdir/$workdir");
	}
    }

    if ($errcnt) {
	logger('INFO', "There were $errcnt errors converting '$workdir'!");
    } else {
	logger('INFO', "Finished converting $workdir!");
    }

    return 1;
}


#
# convert_dir($from_dir)
#
# Convert directory "from_dir" and its subdirectories
#
sub convert_dir {
    my ($srcdir, $workdir, $destdir) = @_;

    logger('INFO', "** Converting Scans **");
    logger('INFO', "Starting in directory '$srcdir/$workdir'");
    
    walk_convert_dir($srcdir, $workdir, $destdir);

    # touch source directory so digilib rescans the thumbnails
    #logger('DEBUG', "/usr/bin/touch $source_base_dirs[0]/$workdir");
    system("/usr/bin/touch '$srcdir/$workdir'");

    logger('DONE', "** Finished converting scans **");
    return 1;
}






###############################################################
## Main

if ($#ARGV < 3) {
    print "Scale-O-Mat $version\n";
    print "  use: scaleomat.pl -src=src-base -dest=dest-base -dir=workdir [...]\n";
    print "    reads from scr-base/workdir and writes to dest-base/workdir\n";
    print "    -scaleto=destination size\n";
    print "    -scaleby=magnification factor.\n";
    print "    -jpegqual=JPEG quality (0-100)\n";
    print "    -replace=yes replaces existing files (default=skip).\n";
    print "    -encoder=tiff_png|tiff_jpeg|tiff_jpeg2\n";
    exit 1;
}

# test software installation
checksoft();

# read command line parameters
my $args = parseargs();

# source dir
my $srcdir = $$args{'src'};

# destination dir
my $destdir = $$args{'dest'};

# working dir
my $workdir = $$args{'dir'};

# destination size
if ($$args{'scaleby'}) {
    $scale_relative = 1;
    $scalesize = $$args{'scaleby'};
    logger('INFO', "Scaling relative by factor $scalesize");
}
if ($$args{'scaleto'}) {
    $scale_relative = 0;
    $scalesize = $$args{'scaleto'};
    logger('INFO', "Scaling absolute to size $scalesize");
}

# JPEG quality
if ($$args{'jpegqual'}) {
    logger('INFO', "JPEG quality set to '$$args{'jpegqual'}'!");
    $jpeg_quality = $$args{'jpegqual'};
}

# force encoder
if ($$args{'encoder'}) {
    logger('INFO', "Using encoder '$$args{'encoder'}'!");
    $use_encoder = $$args{'encoder'};
}

# Overwrite
if ($$args{'replace'}) {
    logger('INFO', "Set to overwrite existing files!");
    $overwrite = 1;
}

# debug
if ($$args{'debug'}) {
    logger('INFO', "Set debug level to $$args{'debug'}!");
    $debug = $$args{'debug'};
}

# simulate
if ($$args{'simulate'}) {
    logger('INFO', "Set to simulate operation only ($$args{'simulate'})!");
    $simulate = $$args{'simulate'};
}

convert_dir($srcdir, $workdir, $destdir);