Jp2 batch converter

Revision as of 04:32, 21 February 2008

Description

The jp2 files used by the Secondlife client, are actually j2k files. These can be encoded by image_to_j2k from openjpeg. The script checks for available tif-files in a root directory, and compresses those to j2k and renames them...

Usage

• Install OpenJPEG svn (if you have trouble compiling, you could try the binaries on their site)

svn co http://www.openjpeg.org/svn/trunk
cd trunk
mkdir bin
cd bin
cmake .. -DBUILD_EXAMPLES:BOOL=ON
make
make install

• Make sure that the binaries image_to_j2k and j2k_to_image can be executed from anywhere

• Put the code in a file named jp2batch.pl, and copy it to the directory where your jpg's are. Call the script:

perl jpg2jp2.pl

Code

#!/usr/bin/perl -s -U
# jp2batch.pl by Phrearch

use Cwd;
$dirs=1;
$files=0; 

sub ScanDirectory{
   my ($workdir) = shift;
  
   my ($startdir) = &cwd; # keep track of where we began

   chdir($workdir) or die "Unable to enter dir $workdir:$!\n";
   opendir(DIR, ".") or die "Unable to open $workdir:$!\n";
   my @names = readdir(DIR) or die "Unable to read $workdir:$!\n";
   closedir(DIR);

   foreach my $name (@names){
       next if ($name eq "."); 
       next if ($name eq "..");
       if (-d $name){ 
       $dirs++;
       &ScanDirectory($name);
       next;
       }
       if (substr($name, -4) eq ".jpg") {
       print "Processing $workdir\\$name...";
       $rawname = substr $name, 0, -4;
       system("convert -format tga $rawname.jpg $rawname.tga &>/dev/null");
       system("rm $name &>/dev/null");
       system("image_to_j2k -i $rawname.tga -o $rawname.j2k -r 20,10,1 &>/dev/null");
       system("mv $rawname.j2k $rawname.jp2 &>/dev/null");
       system("rm $rawname.tga &>/dev/null");
       print "done!\n";
       $files++;
       }
       chdir($startdir) or 
          die "Unable to change to dir $startdir:$!\n";
   }
}
&ScanDirectory(".");
print "\nDirectories scanned:$dirs\nFiles processed:$files\n";