Getting started with iText - Part 19 (Convert TIFF to PDF)

In Part 19 we translate the Tiff2Pdf.java example. It demonstrates how to convert TIFF files to PDF.

How does it work?

At first glance the java example looks a bit more complicated than it is. In summary it uses the RandomAccessFileOrArray and TiffImage classes to read each input file and calculate the number of pages in the image

ra = RandomAccessFileOrArray.init(tiff_file);
totalPages = TiffImage.getNumberOfPages(ra);

Then inside a loop, it obtains an image of each page in the TIFF file. If needed, the image is scaled to fit the new document. Finally each image, and a page header, are added to the PDF file using the document's direct content. See, that was not so complicated was it?

img = TiffImage.getTiffImage( ra, javacast("int", page) );
..
if (img.getScaledWidth() GT 500 OR img.getScaledHeight() GT 700) {
 img.scaleToFit( javacast("float", 500), javacast("float", 700) );
}
..
img.setAbsolutePosition( javacast("float", 20), javacast("float", 20) );
document.add( Paragraph.init(tiff_file &" - page "& page) );
directContent.addImage( img );

What you will need for this example

1. To run the first example, you will need a recent version of iText like 2.0.7. For instructions, see How to use a newer version of iText . If you do not want to install a newer version, skip this step and use the MX7/CF8 example below. Note, the MX7/CF8 example uses deprecated methods.

2. Four(4) input files from the iText site. Download the sample files and place them in the same directory as your .cfm script:
12.tif 338814-00.tif odd.tif even.tif

Documentation: Selected examples: TIFF, Barcodes
Source: Tiff2PDF.java

iText 2.0.7+ Example

<h1>Convert Tiff files to PDF example (iText 2.0.7+)</h1>


<cfscript>
  savedErrorMessage = arrayNew(1);

  // cfSearching: All file paths are relative to the current directory
  arrayOfInputFiles = arrayNew(1);
  arrayAppend(arrayOfInputFiles, ExpandPath("12.tif"));
  arrayAppend(arrayOfInputFiles, ExpandPath("338814-00.tif"));
  arrayAppend(arrayOfInputFiles, ExpandPath("odd.tif"));
  arrayAppend(arrayOfInputFiles, ExpandPath("even.tif"));

  // cfSearching: Get reference to javaLoader stored in server scope
  javaLoader = server[MyUniqueKeyForJavaLoader];

  // cfSearching: Create objects for reuse
  RandomAccessFileOrArray = javaLoader.create("com.lowagie.text.pdf.RandomAccessFileOrArray");
  TiffImage = javaLoader.create("com.lowagie.text.pdf.codec.TiffImage");
  FileOutputStream = createObject("java", "java.io.FileOutputStream");
  PdfWriter = javaLoader.create("com.lowagie.text.pdf.PdfWriter");
  Document = javaLoader.create("com.lowagie.text.Document");
  Paragraph = javaLoader.create("com.lowagie.text.Paragraph");

  for ( fileIndex = 1; fileIndex LTE arrayLen(arrayOfInputFiles); fileIndex = fileIndex + 1) {
      // cfSearching: get the input file (TIFF)
      tiff_file = arrayOfInputFiles[fileIndex];
      // cfSearching: generate the output file name with a PDF extension
      pdf_file = listDeleteAt(tiff_file, listLen(tiff_file, "."), ".") & ".pdf";
      newDocument = Document.init();
    
      try {
          // cfSearching: create a writer to generate the new pdf
          outStream = FileOutputStream.init(pdf_file);
          writer = PdfWriter.getInstance(newDocument, outStream);

          // cfSearching: open the document and get the direct content for writing
          document.open();
          directContent = writer.getDirectContent();

          try {
              // cfSearching: calculate the total number of pages in the tiff file
              ra = RandomAccessFileOrArray.init(tiff_file);
              totalPages = TiffImage.getNumberOfPages(ra);
          }
          catch (java.lang.Throwable e) {
              // cfSearching: if an error occurs, skip this file and go to the next one
              WriteOutput("Exception in "&  tiff_file &" "& e.getMessage());
              continue;
          }

          WriteOutput("Processing: "& tiff_file &"<br>");

          // cfSearching: for each page in the file
             for (page = 1; page LTE totalPages; page = page + 1) {
                 try {
                  // cfSearching: get an image of the current page
                     img = TiffImage.getTiffImage( ra, javacast("int", page) );
                     if ( IsDefined("img") ) {
                      // cfSearching: reduce the image size if needed
                         if (img.getScaledWidth() GT 500 OR img.getScaledHeight() GT 700) {
                             img.scaleToFit( javacast("float", 500), javacast("float", 700) );
                         }

                      // cfSearching: add the current page to the output file
                      img.setAbsolutePosition( javacast("float", 20), javacast("float", 20) );
                      // cfSearching: add a header containing the file path and current page number
                      document.add( Paragraph.init(tiff_file &" - page "& page) );
                         directContent.addImage( img );
                         document.newPage();

                         WriteOutput("page "& page &"<br>");
                     }
               }
                 catch (java.lang.Throwable e) {
                     WriteOutput("Exception "& tiff_file &" page "& page &" "& e.getMessage());
                 }
          }
          ra.close();
          document.close();
      }
      catch (java.lang.Throwable e) {
          arrayAppend(savedErrorMessage, duplicate(e));
      }
  }

  WriteOutput("<hr>Finished!");
</cfscript>


<!--- show any errors --->
<cfif arrayLen(savedErrorMessage) gt 0>
  Error creating documents
  <cfdump var="#savedErrorMessage#">
</cfif>

MX7/CF8 Example (Uses deprecated methods)

<h1>Convert Tiff files to PDF example (MX7/CF8)</h1>

<cfscript>
  savedErrorMessage = arrayNew(1);

  // cfSearching: All file paths are relative to the current directory
  arrayOfInputFiles = arrayNew(1);
  arrayAppend(arrayOfInputFiles, ExpandPath("12.tif"));
  arrayAppend(arrayOfInputFiles, ExpandPath("338814-00.tif"));
  arrayAppend(arrayOfInputFiles, ExpandPath("odd.tif"));
  arrayAppend(arrayOfInputFiles, ExpandPath("even.tif"));

  // cfSearching: Create objects for reuse
  RandomAccessFileOrArray = createObject("java", "com.lowagie.text.pdf.RandomAccessFileOrArray");
  TiffImage = createObject("java", "com.lowagie.text.pdf.codec.TiffImage");
  FileOutputStream = createObject("java", "java.io.FileOutputStream");
  PdfWriter = createObject("java", "com.lowagie.text.pdf.PdfWriter");
  Document = createObject("java", "com.lowagie.text.Document");
  Paragraph = createObject("java", "com.lowagie.text.Paragraph");

  for ( fileIndex = 1; fileIndex LTE arrayLen(arrayOfInputFiles); fileIndex = fileIndex + 1) {
      // cfSearching: get the input file (TIFF)
      tiff_file = arrayOfInputFiles[fileIndex];
      // cfSearching: generate the output file name with a PDF extension
      pdf_file = listDeleteAt(tiff_file, listLen(tiff_file, "."), ".") & ".pdf";
      newDocument = Document.init();
    
      try {
          // cfSearching: create a writer to generate the new pdf
          outStream = FileOutputStream.init(pdf_file);
          writer = PdfWriter.getInstance(newDocument, outStream);

          // cfSearching: open the document and get the direct content for writing
          document.open();
          directContent = writer.getDirectContent();

          try {
              // cfSearching: calculate the total number of pages in the tiff file
              ra = RandomAccessFileOrArray.init(tiff_file);
              totalPages = TiffImage.getNumberOfPages(ra);
          }
          catch (java.lang.Throwable e) {
              // cfSearching: if an error occurs, skip this file and go to the next one
              WriteOutput("Exception in "&  tiff_file &" "& e.getMessage());
              continue;
          }

          WriteOutput("Processing: "& tiff_file &"<br>");

          // cfSearching: for each page in the file
             for (page = 1; page LTE totalPages; page = page + 1) {
                 try {
                  // cfSearching: get an image of the current page
                     img = TiffImage.getTiffImage( ra, javacast("int", page) );
                     if ( IsDefined("img") ) {
                      // cfSearching: reduce the image size if needed
                      // cfSearching: scaledWidth() and scaledHeight() are deprecated. As of iText 2.0.3,
                      // cfSearching: replaced by getScaledHeight(), scheduled for removal at 2.1.0
                         if (img.scaledWidth() GT 500 OR img.scaledHeight() GT 700) {
                             img.scaleToFit( javacast("float", 500), javacast("float", 700) );
                         }

                      // cfSearching: add the current page to the output file
                      img.setAbsolutePosition( javacast("float", 20), javacast("float", 20) );
                      // cfSearching: add a header containing the file path and current page number
                      document.add( Paragraph.init(tiff_file &" - page "& page) );
                         directContent.addImage( img );
                         document.newPage();

                         WriteOutput("page "& page &"<br>");
                     }
               }
                 catch (java.lang.Throwable e) {
                     WriteOutput("Exception "& tiff_file &" page "& page &" "& e.getMessage());
                 }
          }
          ra.close();
          document.close();
      }
      catch (java.lang.Throwable e) {
          arrayAppend(savedErrorMessage, duplicate(e));
      }
  }

  WriteOutput("<hr>Finished!");
</cfscript>


<!--- show any errors --->
<cfif arrayLen(savedErrorMessage) gt 0>
  Error creating documents
  <cfdump var="#savedErrorMessage#">
</cfif>