JFileChooser FileSaveDialog = new JFileChooser(); // instanciates a new filechooser
        if ( CurrentWorkingDirectory != null ) FileSaveDialog.setCurrentDirectory(CurrentWorkingDirectory);
        FileSaveDialog.removeChoosableFileFilter(FileSaveDialog.getChoosableFileFilters()[0]); // the filter "all files" has to be removed
        FileSaveDialog.addChoosableFileFilter(new cImageTIFFileFilter()); // loading the TIFF image file filter
        FileSaveDialog.addChoosableFileFilter(new cImagePNGFileFilter()); // loading the PNG image file filter

       /* just some code */

       try {
           if ( FileSaveDialog.getFileFilter().getDescription() == "target image file format" ) {
               String TargetFilename = FileSaveDialog.getSelectedFile().getAbsolutePath();
               if (!(FileSaveDialog.getSelectedFile().getName().toLowerCase().endsWith(".tif") ||
                     TargetFilename.toLowerCase().endsWith(".tiff"))) // If the user choses a filename without a proper extension, we simply add it for him :)
                   TargetFilename += ".tif";
       /* just some code */
           } else if ( FileSaveDialog.getFileFilter().getDescription() == "portable network graphics" ) {
               String TargetFilename = FileSaveDialog.getSelectedFile().getAbsolutePath();
               if (!(FileSaveDialog.getSelectedFile().getName().toLowerCase().endsWith(".png"))) // If the user choses a filename without a proper extension, we simply add it for him :)
                   TargetFilename += ".png";
       /* just some code */
           }
       } catch (Exception ex) {
           cglobal.DisplayErrorMessage("There was an error saving the image.");
       }