/// <summary>
/// The following sample illustrates how to reduce PDF file size using 'pdftron.PDF.Optimizer'.
/// The sample also shows how to simplify and optimize PDF documents for viewing on mobile devices
/// and on the Web using 'pdftron.PDF.Flattener'.
///
/// @note Both 'Optimizer' and 'Flattener' are separately licensable add-on options to the core PDFNet license.
///
/// ----
///
/// 'pdftron.PDF.Optimizer' can be used to optimize PDF documents by reducing the file size, removing
/// redundant information, and compressing data streams using the latest in image compression technology.
///
/// PDF Optimizer can compress and shrink PDF file size with the following operations:
/// - Remove duplicated fonts, images, ICC profiles, and any other data stream.
/// - Optionally convert high-quality or print-ready PDF files to small, efficient and web-ready PDF.
/// - Optionally down-sample large images to a given resolution.
/// - Optionally compress or recompress PDF images using JBIG2 and JPEG2000 compression formats.
/// - Compress uncompressed streams and remove unused PDF objects.
///
/// ----
///
/// 'pdftron.PDF.Flattener' can be used to speed-up PDF rendering on mobile devices and on the Web by
/// simplifying page content (e.g. flattening complex graphics into images) while maintaining vector text
/// whenever possible.
///
/// Flattener can also be used to simplify process of writing custom converters from PDF to other formats.
/// In this case, Flattener can be used as first step in the conversion pipeline to reduce any PDF to a
/// very simple representation (e.g. vector text on top of a background image).
/// </summary>
static void Main(string[] args)
{
PDFNet.Initialize();
string input_path = "../../TestFiles/";
string output_path = "../../TestFiles/Output/";
string input_filename = "newsletter";
//--------------------------------------------------------------------------------
// Example 1) Simple optimization of a pdf with default settings.
//
try
{
using (PDFDoc doc = new PDFDoc(input_path + input_filename + ".pdf"))
{
doc.InitSecurityHandler();
Optimizer.Optimize(doc);
doc.Save(output_path + input_filename + "_opt1.pdf", SDFDoc.SaveOptions.e_linearized);
}
}
catch (PDFNetException e)
{
Console.WriteLine(e.Message);
}
//--------------------------------------------------------------------------------
// Example 2) Reduce image quality and use jpeg compression for
// non monochrome images.
try
{
using (PDFDoc doc = new PDFDoc(input_path + input_filename + ".pdf"))
{
doc.InitSecurityHandler();
Optimizer.ImageSettings image_settings = new Optimizer.ImageSettings();
// low quality jpeg compression
image_settings.SetCompressionMode(Optimizer.ImageSettings.CompressionMode.e_jpeg);
image_settings.SetQuality(1);
// Set the output dpi to be standard screen resolution
image_settings.SetImageDPI(144, 96);
// this option will recompress images not compressed with
// jpeg compression and use the result if the new image
// is smaller.
image_settings.ForceRecompression(true);
// this option is not commonly used since it can
// potentially lead to larger files. It should be enabled
// only if the output compression specified should be applied
// to every image of a given type regardless of the output image size
//image_settings.ForceChanges(true);
// use the same settings for both color and grayscale images
Optimizer.OptimizerSettings opt_settings = new Optimizer.OptimizerSettings();
opt_settings.SetColorImageSettings(image_settings);
opt_settings.SetGrayscaleImageSettings(image_settings);
Optimizer.Optimize(doc, opt_settings);
doc.Save(output_path + input_filename + "_opt2.pdf", SDFDoc.SaveOptions.e_linearized);
}
}
catch (PDFNetException e)
{
Console.WriteLine(e.Message);
}
//--------------------------------------------------------------------------------
// Example 3) Use monochrome image settings and default settings
// for color and grayscale images.
try
{
using (PDFDoc doc = new PDFDoc(input_path + input_filename + ".pdf"))
{
doc.InitSecurityHandler();
Optimizer.MonoImageSettings mono_image_settings = new Optimizer.MonoImageSettings();
mono_image_settings.SetCompressionMode(Optimizer.MonoImageSettings.CompressionMode.e_jbig2);
mono_image_settings.ForceRecompression(true);
Optimizer.OptimizerSettings opt_settings = new Optimizer.OptimizerSettings();
opt_settings.SetMonoImageSettings(mono_image_settings);
Optimizer.Optimize(doc, opt_settings);
doc.Save(output_path + input_filename + "_opt3.pdf", SDFDoc.SaveOptions.e_linearized);
}
}
catch (PDFNetException e)
{
Console.WriteLine(e.Message);
}
//-------------------------------------------------------------------------------
// Example 4) Use Flattener to simplify content in this document
// using default settings
try
{
using (PDFDoc doc = new PDFDoc(input_path + "TigerText.pdf"))
{
doc.InitSecurityHandler();
Flattener fl = new Flattener();
// The following lines can increase the resolution of background
// images.
//fl.SetDPI(300);
//fl.SetMaximumImagePixels(5000000);
// This line can be used to output Flate compressed background
// images rather than DCTDecode compressed images which is the default
//fl.SetPreferJPG(false);
// In order to adjust thresholds for when text is Flattened
// the following function can be used.
//fl.SetThreshold(Flattener.Threshold.e_keep_most);
// We use e_fast option here since it is usually preferable
// to avoid Flattening simple pages in terms of size and
// rendering speed. If the desire is to simplify the
// document for processing such that it contains only text and
// a background image e_simple should be used instead.
fl.Process(doc, Flattener.FlattenMode.e_fast);
doc.Save(output_path + "TigerText_flatten.pdf", SDFDoc.SaveOptions.e_linearized);
}
}
catch (PDFNetException e)
{
Console.WriteLine(e.Message);
}
}
