Jp2 batch converter

Revision as of 05:36, 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 converts jpg-files to tga-files, which can then be used by image_to_j2k for j2k conversion. At the end the j2k file is renamed to jp2, and can be used as an secondlife texture. Please notice that all textures must have 32,64,128,256,512,1024,etc. dimensions. The script doesn't resize the images yet, but maybe it can be adopted to match the required dimensions...

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 root-directory where your jpg-wannabe-textures are. Call the script:

perl jp2batch.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";