Document Saving

How can I reduce the size of documents in PDF, TIFF or JPEG format?

There are a few things that you can try to reduce the size of a resulting file

• Scan in grayscale or black & white instead of RGB;

• Convert the images to grayscale or black & white before the save or upload call. Read more here;

• Scan in a lower resolution;

• Convert the images to a lower resolution (DPI). Read more here;

• [Optional] If the resulting file is in the JPEG format (.jpg) or is a TIF or PDF that is encoded by the JPEG standard, you can set JPEGQuality to a lower value.

  Before setting the JPEGQuality, set the compression type to the JPEG standard as outlined below.

  Before saving the file,

  • Step 1:
    • If you want to save in PDF format (No PDF Rasterizer Addon license needed for this API),

      DWObject.Addon.PDF.Write.Setup({compression: Dynamsoft.DWT.EnumDWT_PDFCompressionType.PDF_JPEG});
      //or set DWObject.Addon.PDF.Write.Setup({compression: 5}); which is equivalent.
    

      <!--Note: if you are using this method, you need to include dynamsoft.webtwain.addon.pdf.js file into the program. For example:-->
      <script type="text/javascript" src="Resources/addon/dynamsoft.webtwain.addon.pdf.js"> </script>
    

    • If you want to save in TIF format,

      DWObject.TIFFCompressionType = Dynamsoft.DWT.EnumDWT_TIFFCompressionType.TIFF_JPEG;
      //or set DWObject.TIFFCompressionType = 7 which is equivalent.
    

    • If you want to save in JPEG format, please jump to Step 2 directly.
  • Step 2:
    • set the JPEGQuality to a lower value, for example:

      DWObject.JPEGQuality = 20;
    

  Note that black & white image cannot be saved in the JPEG format. To reduce the size, please convert the image to grayscale.