Класс PdfMrcCompressionSettings

В этом разделе

Класс, содержащий настройки кодирования PDF документа со сжатием MRC.

Объектная модель

Синтаксис

Visual Basic
C#
Управляемые расширения для C++
C++/CLI

'Declaration

Public Class PdfMrcCompressionSettings

public class PdfMrcCompressionSettings

public __gc class PdfMrcCompressionSettings

public ref class PdfMrcCompressionSettings

Ремарки

Технология сжатия PDF MRC (смешанное растровое содержимое) используется для минимизации размера файлов PDF и PDF/A. Алгоритм сжатия PDF MRC анализирует изображение документа, находит объекты изображения и текстовые области на изображении документа, делит изображение документа на слои и сжимает каждый слой с наилучшим сжатием.

Изображение документа можно разделить на следующие слои :

Фоновый слой - слой, содержащий объекты, которые не были классифицированы как изображения или текст.
Слой изображений - слой, содержащий объекты изображений (компоненты непрерывного тона)
Слой маски - слой, содержащий текст.
Передний слой - слой, который используется для окраски текста.

Пример

Этот код C#/VB.NET показывает как сжать изображения документов, содержащих текст и изображения, с помощью алгоритма сжатия MRC и получить результирующие изображения высокого качества.

VB.NET


Public Shared Sub SetSetting_DocumentWithImagesHiQuality(settings As Vintasoft.Imaging.Codecs.Encoders.PdfMrcCompressionSettings)
    settings.CreateBackgroundLayer = True
    settings.BackgroundLayerCompression = Vintasoft.Imaging.Pdf.PdfCompression.Jpeg Or Vintasoft.Imaging.Pdf.PdfCompression.Zip
    settings.BackgroundLayerCompressionSettings.JpegQuality = 60

    settings.ImageSegmentation = New Vintasoft.Imaging.ImageProcessing.Info.ImageSegmentationCommand()
    settings.CreateImagesLayer = False

    settings.HiQualityMask = True
    settings.MaskCompression = Vintasoft.Imaging.Pdf.PdfCompression.Jbig2
    settings.MaskCompressionSettings.Jbig2Settings.Lossy = True

    settings.CreateFrontLayer = True
    settings.HiQualityFrontLayer = True
    settings.FrontLayerCompression = Vintasoft.Imaging.Pdf.PdfCompression.Jpeg2000
    settings.FrontLayerCompressionSettings.Jpeg2000Settings.CompressionRatio = 300 * 3
    settings.FrontLayerCompressionSettings.Jpeg2000Settings.CompressionType = Vintasoft.Imaging.Codecs.ImageFiles.Jpeg2000.Jpeg2000CompressionType.Lossy
End Sub


public static void SetSetting_DocumentWithImagesHiQuality(
    Vintasoft.Imaging.Codecs.Encoders.PdfMrcCompressionSettings settings)
{
    settings.CreateBackgroundLayer = true;
    settings.BackgroundLayerCompression = 
        Vintasoft.Imaging.Pdf.PdfCompression.Jpeg | 
        Vintasoft.Imaging.Pdf.PdfCompression.Zip;
    settings.BackgroundLayerCompressionSettings.JpegQuality = 60;

    settings.ImageSegmentation =
        new Vintasoft.Imaging.ImageProcessing.Info.ImageSegmentationCommand();
    settings.CreateImagesLayer = false;

    settings.HiQualityMask = true;
    settings.MaskCompression = Vintasoft.Imaging.Pdf.PdfCompression.Jbig2;
    settings.MaskCompressionSettings.Jbig2Settings.Lossy = true;

    settings.CreateFrontLayer = true;
    settings.HiQualityFrontLayer = true;
    settings.FrontLayerCompression = Vintasoft.Imaging.Pdf.PdfCompression.Jpeg2000;
    settings.FrontLayerCompressionSettings.Jpeg2000Settings.CompressionRatio = 300 * 3;
    settings.FrontLayerCompressionSettings.Jpeg2000Settings.CompressionType = 
        Vintasoft.Imaging.Codecs.ImageFiles.Jpeg2000.Jpeg2000CompressionType.Lossy;
}

Вот C#/VB.NET код, который демонстрирует, как сжимать изображения документов, содержащих текст и изображения, с использованием алгоритма сжатия MRC и получать результирующие изображения нормального качества.

VB.NET


Public Shared Sub SetSetting_DocumentWithImagesNormal(settings As Vintasoft.Imaging.Codecs.Encoders.PdfMrcCompressionSettings)
    settings.CreateBackgroundLayer = True
    settings.BackgroundLayerCompression = Vintasoft.Imaging.Pdf.PdfCompression.Jpeg Or Vintasoft.Imaging.Pdf.PdfCompression.Zip
    settings.BackgroundLayerCompressionSettings.JpegQuality = 35

    settings.ImageSegmentation = New Vintasoft.Imaging.ImageProcessing.Info.ImageSegmentationCommand()
    settings.CreateImagesLayer = False

    settings.HiQualityMask = True
    settings.MaskCompression = Vintasoft.Imaging.Pdf.PdfCompression.Jbig2
    settings.MaskCompressionSettings.Jbig2Settings.Lossy = True

    settings.CreateFrontLayer = True
    settings.HiQualityFrontLayer = True
    settings.FrontLayerCompression = Vintasoft.Imaging.Pdf.PdfCompression.Jpeg Or Vintasoft.Imaging.Pdf.PdfCompression.Zip
    settings.FrontLayerCompressionSettings.JpegQuality = 25
    settings.FrontLayerCompressionSettings.Jpeg2000Settings.CompressionRatio = 400 * 3
    settings.FrontLayerCompressionSettings.Jpeg2000Settings.CompressionType = Vintasoft.Imaging.Codecs.ImageFiles.Jpeg2000.Jpeg2000CompressionType.Lossy
End Sub


public static void SetSetting_DocumentWithImagesNormal(
    Vintasoft.Imaging.Codecs.Encoders.PdfMrcCompressionSettings settings)
{
    settings.CreateBackgroundLayer = true;
    settings.BackgroundLayerCompression = 
        Vintasoft.Imaging.Pdf.PdfCompression.Jpeg | 
        Vintasoft.Imaging.Pdf.PdfCompression.Zip;
    settings.BackgroundLayerCompressionSettings.JpegQuality = 35;

    settings.ImageSegmentation = 
        new Vintasoft.Imaging.ImageProcessing.Info.ImageSegmentationCommand();
    settings.CreateImagesLayer = false;

    settings.HiQualityMask = true;
    settings.MaskCompression = 
        Vintasoft.Imaging.Pdf.PdfCompression.Jbig2;
    settings.MaskCompressionSettings.Jbig2Settings.Lossy = true;

    settings.CreateFrontLayer = true;
    settings.HiQualityFrontLayer = true;
    settings.FrontLayerCompression = 
        Vintasoft.Imaging.Pdf.PdfCompression.Jpeg | 
        Vintasoft.Imaging.Pdf.PdfCompression.Zip;
    settings.FrontLayerCompressionSettings.JpegQuality = 25;
    settings.FrontLayerCompressionSettings.Jpeg2000Settings.CompressionRatio = 400 * 3;
    settings.FrontLayerCompressionSettings.Jpeg2000Settings.CompressionType = 
        Vintasoft.Imaging.Codecs.ImageFiles.Jpeg2000.Jpeg2000CompressionType.Lossy;
}

VB.NET


Public Shared Sub SetSetting_DocumentWithImagesHiCompression(settings As Vintasoft.Imaging.Codecs.Encoders.PdfMrcCompressionSettings)
    settings.CreateBackgroundLayer = True
    settings.BackgroundLayerCompression = Vintasoft.Imaging.Pdf.PdfCompression.Jpeg Or Vintasoft.Imaging.Pdf.PdfCompression.Zip
    settings.BackgroundLayerCompressionSettings.JpegQuality = 20

    settings.ImageSegmentation = New Vintasoft.Imaging.ImageProcessing.Info.ImageSegmentationCommand()
    settings.CreateImagesLayer = False

    settings.HiQualityMask = False
    settings.MaskCompression = Vintasoft.Imaging.Pdf.PdfCompression.Jbig2
    settings.MaskCompressionSettings.Jbig2Settings.Lossy = True

    settings.CreateFrontLayer = True
    settings.HiQualityFrontLayer = False
    settings.FrontLayerCompression = Vintasoft.Imaging.Pdf.PdfCompression.Zip
End Sub


public static void SetSetting_DocumentWithImagesHiCompression(
    Vintasoft.Imaging.Codecs.Encoders.PdfMrcCompressionSettings settings)
{
    settings.CreateBackgroundLayer = true;
    settings.BackgroundLayerCompression = 
        Vintasoft.Imaging.Pdf.PdfCompression.Jpeg | 
        Vintasoft.Imaging.Pdf.PdfCompression.Zip;
    settings.BackgroundLayerCompressionSettings.JpegQuality = 20;

    settings.ImageSegmentation = 
        new Vintasoft.Imaging.ImageProcessing.Info.ImageSegmentationCommand();
    settings.CreateImagesLayer = false;

    settings.HiQualityMask = false;
    settings.MaskCompression = Vintasoft.Imaging.Pdf.PdfCompression.Jbig2;
    settings.MaskCompressionSettings.Jbig2Settings.Lossy = true;

    settings.CreateFrontLayer = true;
    settings.HiQualityFrontLayer = false;
    settings.FrontLayerCompression = Vintasoft.Imaging.Pdf.PdfCompression.Zip;
}

Вот C#/VB.NET код, который демонстрирует, как сжимать изображения документов, которые содержат только текст, с использованием алгоритма сжатия MRC и получать результирующие изображения с высоким качеством.

VB.NET


Public Shared Sub SetSetting_DocumentNoImagesHiQuality(settings As Vintasoft.Imaging.Codecs.Encoders.PdfMrcCompressionSettings)
    settings.CreateBackgroundLayer = True
    settings.BackgroundLayerCompression = Vintasoft.Imaging.Pdf.PdfCompression.Jpeg Or Vintasoft.Imaging.Pdf.PdfCompression.Zip
    settings.BackgroundLayerCompressionSettings.JpegQuality = 30

    settings.ImageSegmentation = Nothing
    settings.CreateImagesLayer = False

    settings.HiQualityMask = True
    settings.MaskCompression = Vintasoft.Imaging.Pdf.PdfCompression.Jbig2
    settings.MaskCompressionSettings.Jbig2Settings.Lossy = True

    settings.CreateFrontLayer = True
    settings.HiQualityFrontLayer = True
    settings.FrontLayerCompression = Vintasoft.Imaging.Pdf.PdfCompression.Jpeg2000
    settings.FrontLayerCompressionSettings.Jpeg2000Settings.CompressionRatio = 300 * 3
    settings.FrontLayerCompressionSettings.Jpeg2000Settings.CompressionType = Vintasoft.Imaging.Codecs.ImageFiles.Jpeg2000.Jpeg2000CompressionType.Lossy
End Sub


public static void SetSetting_DocumentNoImagesHiQuality(
    Vintasoft.Imaging.Codecs.Encoders.PdfMrcCompressionSettings settings)
{
    settings.CreateBackgroundLayer = true;
    settings.BackgroundLayerCompression = 
        Vintasoft.Imaging.Pdf.PdfCompression.Jpeg | 
        Vintasoft.Imaging.Pdf.PdfCompression.Zip;
    settings.BackgroundLayerCompressionSettings.JpegQuality = 30;

    settings.ImageSegmentation = null;
    settings.CreateImagesLayer = false;

    settings.HiQualityMask = true;
    settings.MaskCompression = 
        Vintasoft.Imaging.Pdf.PdfCompression.Jbig2;
    settings.MaskCompressionSettings.Jbig2Settings.Lossy = true;

    settings.CreateFrontLayer = true;
    settings.HiQualityFrontLayer = true;
    settings.FrontLayerCompression = 
        Vintasoft.Imaging.Pdf.PdfCompression.Jpeg2000;
    settings.FrontLayerCompressionSettings.Jpeg2000Settings.CompressionRatio = 300 * 3;
    settings.FrontLayerCompressionSettings.Jpeg2000Settings.CompressionType = 
        Vintasoft.Imaging.Codecs.ImageFiles.Jpeg2000.Jpeg2000CompressionType.Lossy;
}

VB.NET


Public Shared Sub SetSetting_DocumentNoImagesNormal(settings As Vintasoft.Imaging.Codecs.Encoders.PdfMrcCompressionSettings)
    settings.CreateBackgroundLayer = True
    settings.BackgroundLayerCompression = Vintasoft.Imaging.Pdf.PdfCompression.Jpeg Or Vintasoft.Imaging.Pdf.PdfCompression.Zip
    settings.BackgroundLayerCompressionSettings.JpegQuality = 25

    settings.ImageSegmentation = Nothing
    settings.CreateImagesLayer = False

    settings.HiQualityMask = True
    settings.MaskCompression = Vintasoft.Imaging.Pdf.PdfCompression.Jbig2
    settings.MaskCompressionSettings.Jbig2Settings.Lossy = True

    settings.CreateFrontLayer = True
    settings.HiQualityFrontLayer = False
    settings.FrontLayerCompression = Vintasoft.Imaging.Pdf.PdfCompression.Jpeg2000
    settings.FrontLayerCompressionSettings.Jpeg2000Settings.CompressionRatio = 350 * 3
    settings.FrontLayerCompressionSettings.Jpeg2000Settings.CompressionType = Vintasoft.Imaging.Codecs.ImageFiles.Jpeg2000.Jpeg2000CompressionType.Lossy
End Sub


public static void SetSetting_DocumentNoImagesNormal(
    Vintasoft.Imaging.Codecs.Encoders.PdfMrcCompressionSettings settings)
{
    settings.CreateBackgroundLayer = true;
    settings.BackgroundLayerCompression = 
        Vintasoft.Imaging.Pdf.PdfCompression.Jpeg | 
        Vintasoft.Imaging.Pdf.PdfCompression.Zip;
    settings.BackgroundLayerCompressionSettings.JpegQuality = 25;

    settings.ImageSegmentation = null;
    settings.CreateImagesLayer = false;

    settings.HiQualityMask = true;
    settings.MaskCompression = 
        Vintasoft.Imaging.Pdf.PdfCompression.Jbig2;
    settings.MaskCompressionSettings.Jbig2Settings.Lossy = true;

    settings.CreateFrontLayer = true;
    settings.HiQualityFrontLayer = false;
    settings.FrontLayerCompression = 
        Vintasoft.Imaging.Pdf.PdfCompression.Jpeg2000;
    settings.FrontLayerCompressionSettings.Jpeg2000Settings.CompressionRatio = 350 * 3;
    settings.FrontLayerCompressionSettings.Jpeg2000Settings.CompressionType = 
        Vintasoft.Imaging.Codecs.ImageFiles.Jpeg2000.Jpeg2000CompressionType.Lossy;
}

VB.NET


Public Shared Sub SetSetting_DocumentNoImagesHiCompression(settings As Vintasoft.Imaging.Codecs.Encoders.PdfMrcCompressionSettings)
    settings.CreateBackgroundLayer = True
    settings.BackgroundLayerCompression = Vintasoft.Imaging.Pdf.PdfCompression.Jpeg Or Vintasoft.Imaging.Pdf.PdfCompression.Zip
    settings.BackgroundLayerCompressionSettings.JpegQuality = 20

    settings.ImageSegmentation = Nothing
    settings.CreateImagesLayer = False

    settings.HiQualityMask = False
    settings.MaskCompression = Vintasoft.Imaging.Pdf.PdfCompression.Jbig2
    settings.MaskCompressionSettings.Jbig2Settings.Lossy = True

    settings.CreateFrontLayer = True
    settings.HiQualityFrontLayer = False
    settings.FrontLayerCompression = Vintasoft.Imaging.Pdf.PdfCompression.Jpeg2000
    settings.FrontLayerCompressionSettings.Jpeg2000Settings.CompressionRatio = 450 * 3
    settings.FrontLayerCompressionSettings.Jpeg2000Settings.CompressionType = Vintasoft.Imaging.Codecs.ImageFiles.Jpeg2000.Jpeg2000CompressionType.Lossy
End Sub


public static void SetSetting_DocumentNoImagesHiCompression(
    Vintasoft.Imaging.Codecs.Encoders.PdfMrcCompressionSettings settings)
{
    settings.CreateBackgroundLayer = true;
    settings.BackgroundLayerCompression = 
        Vintasoft.Imaging.Pdf.PdfCompression.Jpeg | 
        Vintasoft.Imaging.Pdf.PdfCompression.Zip;
    settings.BackgroundLayerCompressionSettings.JpegQuality = 20;

    settings.ImageSegmentation = null;
    settings.CreateImagesLayer = false;

    settings.HiQualityMask = false;
    settings.MaskCompression = 
        Vintasoft.Imaging.Pdf.PdfCompression.Jbig2;
    settings.MaskCompressionSettings.Jbig2Settings.Lossy = true;

    settings.CreateFrontLayer = true;
    settings.HiQualityFrontLayer = false;
    settings.FrontLayerCompression = 
        Vintasoft.Imaging.Pdf.PdfCompression.Jpeg2000;
    settings.FrontLayerCompressionSettings.Jpeg2000Settings.CompressionRatio = 450 * 3;
    settings.FrontLayerCompressionSettings.Jpeg2000Settings.CompressionType = 
        Vintasoft.Imaging.Codecs.ImageFiles.Jpeg2000.Jpeg2000CompressionType.Lossy;
}

Иерархия наследования

System.Object
Vintasoft.Imaging.Codecs.Encoders.PdfMrcCompressionSettings

Требования

Целевые платформы: .NET 8; .NET 7; .NET 6; .NET Framework 4.8, 4.7, 4.6, 4.5, 4.0, 3.5

Смотрите также

Справочник

Члены типа PdfMrcCompressionSettings
Пространство имен Vintasoft.Imaging.Codecs.Encoders

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