PdfMrcEncoder Class

In This Topic

Defines an encoder that uses the Mixed Raster Content (MRC) lossy compression for encoding PDF documents.

Object Model

Syntax

Visual Basic
C#
Managed Extensions for C++
C++/CLI

'Declaration
 
Public Class PdfMrcEncoder 
   Inherits PdfEncoder
   Implements IPdfEncoder

public class PdfMrcEncoder : PdfEncoder, IPdfEncoder

public __gc class PdfMrcEncoder : public PdfEncoder, IPdfEncoder

public ref class PdfMrcEncoder : public PdfEncoder, IPdfEncoder

Example

This example shows how to encode images to PDF format using MRC compression:

VB.NET

Public Shared Sub EncodeImagesUseMrc(images As Vintasoft.Imaging.ImageCollection, pdfFilename As String)
	' create PDF MRC encoder
	Dim encoder As New Vintasoft.Imaging.Codecs.Encoders.PdfMrcEncoder()
            
	' set MRC compression settings
	SetCompressionSettings(encoder.MrcCompressionSettings)
            
	' save images to PDF use MRC compression
	images.SaveSync(pdfFilename, encoder)
End Sub
            
Private Shared Sub SetCompressionSettings(settings As Vintasoft.Imaging.Codecs.Encoders.PdfMrcCompressionSettings)
	' background layer
	settings.CreateBackgroundLayer = True
	settings.BackgroundLayerCompression = Vintasoft.Imaging.Pdf.PdfCompression.Jpeg Or Vintasoft.Imaging.Pdf.PdfCompression.Zip
	settings.BackgroundLayerCompressionSettings.JpegQuality = 35
            
	' images layer, images placed to background layer
	settings.ImageSegmentation = New Vintasoft.Imaging.ImageProcessing.Info.ImageSegmentationCommand()
	settings.CreateImagesLayer = False
            
	' mask layer
	settings.HiQualityMask = True
	settings.MaskCompression = Vintasoft.Imaging.Pdf.PdfCompression.Jbig2
	settings.MaskCompressionSettings.Jbig2Settings.Lossy = True
            
	' front layer
	settings.CreateFrontLayer = True
	settings.HiQualityFrontLayer = True
	settings.FrontLayerCompression = Vintasoft.Imaging.Pdf.PdfCompression.Jpeg Or Vintasoft.Imaging.Pdf.PdfCompression.Zip
	settings.FrontLayerCompressionSettings.JpegQuality = 25
End Sub

public static void EncodeImagesUseMrc(Vintasoft.Imaging.ImageCollection images, string pdfFilename)
{
    // create PDF MRC encoder
    Vintasoft.Imaging.Codecs.Encoders.PdfMrcEncoder encoder = 
        new Vintasoft.Imaging.Codecs.Encoders.PdfMrcEncoder();
    
    // set MRC compression settings
    SetCompressionSettings(encoder.MrcCompressionSettings);
    
    // save images to PDF use MRC compression
    images.SaveSync(pdfFilename, encoder);
}
            
private static void SetCompressionSettings(Vintasoft.Imaging.Codecs.Encoders.PdfMrcCompressionSettings settings)
{
    // background layer
    settings.CreateBackgroundLayer = true;
    settings.BackgroundLayerCompression = 
        Vintasoft.Imaging.Pdf.PdfCompression.Jpeg | Vintasoft.Imaging.Pdf.PdfCompression.Zip;
    settings.BackgroundLayerCompressionSettings.JpegQuality = 35;
            
    // images layer, images placed to background layer
    settings.ImageSegmentation = 
        new Vintasoft.Imaging.ImageProcessing.Info.ImageSegmentationCommand();
    settings.CreateImagesLayer = false;
            
    // mask layer
    settings.HiQualityMask = true;
    settings.MaskCompression = Vintasoft.Imaging.Pdf.PdfCompression.Jbig2;
    settings.MaskCompressionSettings.Jbig2Settings.Lossy = true;
            
    // front layer
    settings.CreateFrontLayer = true;
    settings.HiQualityFrontLayer = true;
    settings.FrontLayerCompression = 
        Vintasoft.Imaging.Pdf.PdfCompression.Jpeg | 
        Vintasoft.Imaging.Pdf.PdfCompression.Zip;
    settings.FrontLayerCompressionSettings.JpegQuality = 25;
}

Inheritance Hierarchy

System.Object
   Vintasoft.Imaging.Codecs.Encoders.EncoderBase
      Vintasoft.Imaging.Codecs.Encoders.MultipageEncoderBase
         Vintasoft.Imaging.Codecs.Encoders.PdfEncoder
            Vintasoft.Imaging.Codecs.Encoders.PdfMrcEncoder

Requirements

Target Platforms: .NET 5; .NET Core 3.1; .NET Framework 4.8, 4.7, 4.6, 4.5, 4.0, 3.5

Reference

PdfMrcEncoder Members
Vintasoft.Imaging.Codecs.Encoders Namespace
PdfMrcCompressionSettings Class

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