Кодеки: Как преобразовать PDF в TIFF?

В этом разделе

VintaSoft Imaging .NET SDK рендерить PDF страницу (рисует текст, изображения и графику на PDF странице) при преобразовании PDF документа в TIFF файл.

По умолчанию SDK:

Рендерит PDF страницу с разрешением 96 точек на дюйм.
Ищет внешний шрифт в каталоге "$ASSEMBLY_DIRECTORY$\Fonts\" и в каталоге шрифтов операционной системы.

Вам необходимо переопределить алгоритм поиска внешних шрифтов, если PDF документ содержит нестандартные внешние шрифты. Это можно сделать с помощью класса FileFontProgramsControllerWithFallbackFont.
Более подробную информацию о шрифтах в PDF документе можно найти здесь .

VintaSoft Imaging .NET SDK позволяет конвертировать PDF документ в TIFF файл, используя класс DocumentConverter, ImageCollection или TiffFile. Использование класса DocumentConverter обеспечивает наилучшую производительность, поскольку класс DocumentConverter использует многопоточность.

Вот C#/VB.NET код, который демонстрирует, как сконвертировать PDF документ с разрешением по умолчанию (96 точек на дюйм) в TIFF файл с помощью класса DocumentConverter:

/// <summary>
/// Converts PDF document to a TIFF file using Vintasoft.Imaging.DocumentConverter class.
/// </summary>
public static void ConvertPdfToTiff_DocumentConverter(string pdfFileName, string tiffFileName)
{
    Vintasoft.Imaging.DocumentConverter.Convert(pdfFileName, tiffFileName);
}

VB.NET

''' <summary>
''' Converts PDF document to a TIFF file using Vintasoft.Imaging.DocumentConverter class.
''' </summary>
Public Shared Sub ConvertPdfToTiff_DocumentConverter(pdfFileName As String, tiffFileName As String)
    Vintasoft.Imaging.DocumentConverter.Convert(pdfFileName, tiffFileName)
End Sub

Вот C#/VB.NET код, который демонстрирует, как преобразовать PDF документ с указанным разрешением в TIFF файл с помощью класса DocumentConverter:

/// <summary>
/// Converts PDF document to TIFF file using Vintasoft.Imaging.DocumentConverter class.
/// PDF document is rendered with specified resolution.
/// </summary>
public static void ConvertPdfToTiff_CustomResolution_DocumentConverter(string pdfFileName, string tiffFileName)
{
    // create the document convertor
    Vintasoft.Imaging.DocumentConverter converter = new Vintasoft.Imaging.DocumentConverter();
    // subscribe to the DocumentConverter.ImageDecodingStarting event
    converter.ImageDecodingStarting += Converter_ImageDecodingStarting;
    // add PDF pages to the document convertor
    converter.Images.Add(pdfFileName);
    // convert PDF pages to TIFF images
    converter.Convert(tiffFileName);
}

/// <summary>
/// Event handler for the DocumentConverter.ImageDecodingStarting event.
/// </summary>
/// <param name="sender">Object.</param>
/// <param name="e">Event args.</param>
private static void Converter_ImageDecodingStarting(object sender, Vintasoft.Imaging.ImageDecodingStartingEventArgs e)
{
    if (e.RenderingSettings != null)
    {
        // change decoding file resolution
        e.RenderingSettings.Resolution = new Vintasoft.Imaging.Resolution(128, 128);
    }
}

VB.NET

''' <summary>
''' Converts PDF document to TIFF file using Vintasoft.Imaging.DocumentConverter class.
''' PDF document is rendered with specified resolution.
''' </summary>
Public Shared Sub ConvertPdfToTiff_CustomResolution_DocumentConverter(pdfFileName As String, tiffFileName As String)
    ' create the document convertor
    Dim converter As New Vintasoft.Imaging.DocumentConverter()
    ' subscribe to the DocumentConverter.ImageDecodingStarting event
    AddHandler converter.ImageDecodingStarting, AddressOf Converter_ImageDecodingStarting
    ' add PDF pages to the document convertor
    converter.Images.Add(pdfFileName)
    ' convert PDF pages to TIFF images
    converter.Convert(tiffFileName)
End Sub

''' <summary>
''' Event handler for the DocumentConverter.ImageDecodingStarting event.
''' </summary>
''' <param name="sender">Object.</param>
''' <param name="e">Event args.</param>
Private Shared Sub Converter_ImageDecodingStarting(sender As Object, e As Vintasoft.Imaging.ImageDecodingStartingEventArgs)
    If e.RenderingSettings IsNot Nothing Then
        ' change decoding file resolution
        e.RenderingSettings.Resolution = New Vintasoft.Imaging.Resolution(128, 128)
    End If
End Sub

Вот C#/VB.NET код, который демонстрирует, как преобразовать PDF документ с разрешением по умолчанию (96 точек на дюйм) в TIFF файл с использованием класса ImageCollection:

/// <summary>
/// Converts PDF document to TIFF file using ImageCollection and TiffEncoder classes.
/// </summary>
public static void ConvertPdfToTiff_ImageCollection(string pdfFileName, string tiffFileName)
{
    // create image collection
    using (Vintasoft.Imaging.ImageCollection imageCollection = 
        new Vintasoft.Imaging.ImageCollection())
    {
        // add PDF document to collection
        imageCollection.Add(pdfFileName);

        // create TiffEncoder
        using (Vintasoft.Imaging.Codecs.Encoders.TiffEncoder tiffEncoder = 
            new Vintasoft.Imaging.Codecs.Encoders.TiffEncoder(true))
        {
            // set TIFF compression to Zip
            tiffEncoder.Settings.Compression = 
                Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffCompression.Zip;

            // save images of image collection to TIFF file using TiffEncoder
            imageCollection.SaveSync(tiffFileName, tiffEncoder);
        }

        // dispose images
        imageCollection.ClearAndDisposeItems();
    }
}

VB.NET

''' <summary>
''' Converts PDF document to TIFF file using ImageCollection and TiffEncoder classes.
''' </summary>
Public Shared Sub ConvertPdfToTiff_ImageCollection(pdfFileName As String, tiffFileName As String)
    ' create image collection
    Using imageCollection As New Vintasoft.Imaging.ImageCollection()
        ' add PDF document to collection
        imageCollection.Add(pdfFileName)

        ' create TiffEncoder
        Using tiffEncoder As New Vintasoft.Imaging.Codecs.Encoders.TiffEncoder(True)
            ' set TIFF compression to Zip
            tiffEncoder.Settings.Compression = Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffCompression.Zip

            ' save images of image collection to TIFF file using TiffEncoder
            imageCollection.SaveSync(tiffFileName, tiffEncoder)
        End Using

        ' dispose images
        imageCollection.ClearAndDisposeItems()
    End Using
End Sub

Вот C#/VB.NET код, который демонстрирует, как преобразовать PDF документ с указанным разрешением в TIFF файл с использованием класса ImageCollection:

/// <summary>
/// Converts PDF document to TIFF file using ImageCollection and TiffEncoder classes.
/// PDF document is rendered with specified resolution.
/// </summary>
public static void ConvertPdfToTiffU_CustomResolution_ImageCollection(string pdfFileName, string tiffFileName, float dpi)
{
    // create image collection
    using (Vintasoft.Imaging.ImageCollection imageCollection = new Vintasoft.Imaging.ImageCollection())
    {
        // add PDF document to collection
        imageCollection.Add(pdfFileName);

        // set rendering settings
        imageCollection.SetRenderingSettings(new Vintasoft.Imaging.Codecs.Decoders.RenderingSettings(
            dpi,
            dpi,
            Vintasoft.Imaging.ImageInterpolationMode.HighQualityBilinear,
            Vintasoft.Imaging.Drawing.DrawingSmoothingMode.AntiAlias));

        // create TiffEncoder
        using (Vintasoft.Imaging.Codecs.Encoders.TiffEncoder tiffEncoder = 
            new Vintasoft.Imaging.Codecs.Encoders.TiffEncoder(true))
        {
            // set TIFF compression to Zip
            tiffEncoder.Settings.Compression = 
                Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffCompression.Zip;

            // save images of image collection to TIFF file using TiffEncoder
            imageCollection.SaveSync(tiffFileName, tiffEncoder);
        }

        // dispose images
        imageCollection.ClearAndDisposeItems();
    }
}

VB.NET

''' <summary>
''' Converts PDF document to TIFF file using ImageCollection and TiffEncoder classes.
''' PDF document is rendered with specified resolution.
''' </summary>
Public Shared Sub ConvertPdfToTiffU_CustomResolution_ImageCollection(pdfFileName As String, tiffFileName As String, dpi As Single)
    ' create image collection
    Using imageCollection As New Vintasoft.Imaging.ImageCollection()
        ' add PDF document to collection
        imageCollection.Add(pdfFileName)

        ' set rendering settings
        imageCollection.SetRenderingSettings(New Vintasoft.Imaging.Codecs.Decoders.RenderingSettings(dpi, dpi, Vintasoft.Imaging.ImageInterpolationMode.HighQualityBilinear, Vintasoft.Imaging.Drawing.DrawingSmoothingMode.AntiAlias))

        ' create TiffEncoder
        Using tiffEncoder As New Vintasoft.Imaging.Codecs.Encoders.TiffEncoder(True)
            ' set TIFF compression to Zip
            tiffEncoder.Settings.Compression = Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffCompression.Zip

            ' save images of image collection to TIFF file using TiffEncoder
            imageCollection.SaveSync(tiffFileName, tiffEncoder)
        End Using

        ' dispose images
        imageCollection.ClearAndDisposeItems()
    End Using
End Sub

Вот C#/VB.NET код, который демонстрирует, как преобразовать PDF документ с разрешением по умолчанию (96 точек на дюйм) в TIFF файл с использованием классов PdfDocument и TiffFile:

/// <summary>
/// Converts PDF document to TIFF file using PdfDocument and TiffFile classes.
/// </summary>
public static void ConvertPdfToTiff_TiffFile(string pdfFileName, string tiffFileName)
{
    // open existing PDF document
    using (Vintasoft.Imaging.Pdf.PdfDocument pdfDocument = new Vintasoft.Imaging.Pdf.PdfDocument(pdfFileName))
    {
        // create new TIFF file
        using (Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffFile tiffFile = 
            new Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffFile(tiffFileName, 
                Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffFileFormat.LittleEndian))
        {
            // set TIFF compression to Zip
            tiffFile.Pages.EncoderSettings.Compression = 
                Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffCompression.Zip;
            // for each PDF page
            for (int i = 0; i < pdfDocument.Pages.Count; i++)
            {
                // render PDF page and add as image to Tiff file
                tiffFile.Pages.Add(pdfDocument.Pages[i].Render());
                // save changes to TIFF file
                tiffFile.SaveChanges();
            }
        }
    }
}

VB.NET

''' <summary>
''' Converts PDF document to TIFF file using PdfDocument and TiffFile classes.
''' </summary>
Public Shared Sub ConvertPdfToTiff_TiffFile(pdfFileName As String, tiffFileName As String)
    ' open existing PDF document
    Using pdfDocument As New Vintasoft.Imaging.Pdf.PdfDocument(pdfFileName)
        ' create new TIFF file
        Using tiffFile As New Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffFile(tiffFileName, Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffFileFormat.LittleEndian)
            ' set TIFF compression to Zip
            tiffFile.Pages.EncoderSettings.Compression = Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffCompression.Zip
            ' for each PDF page
            For i As Integer = 0 To pdfDocument.Pages.Count - 1
                ' render PDF page and add as image to Tiff file
                tiffFile.Pages.Add(pdfDocument.Pages(i).Render())
                ' save changes to TIFF file
                tiffFile.SaveChanges()
            Next
        End Using
    End Using
End Sub

Вот C#/VB.NET код, который демонстрирует, как преобразовать PDF документ с указанным разрешением в TIFF файл с помощью классов PdfDocument и TiffFile:

/// <summary>
/// Converts PDF document to TIFF file using PdfDocument and TiffFile classes.
/// PDF document is rendered with specified resolution.
/// </summary>
public static void ConvertPdfToTiff_CustomResolution_TiffFile(string pdfFileName, string tiffFileName, float dpi)
{
    // open existing PDF document
    using (Vintasoft.Imaging.Pdf.PdfDocument pdfDocument = 
        new Vintasoft.Imaging.Pdf.PdfDocument(pdfFileName))
    {
        // set resolution
        pdfDocument.RenderingSettings.Resolution = 
            new Vintasoft.Imaging.Resolution(dpi, dpi);
        
        // set rendering mode - optimal balance between rendering speed and quality
        pdfDocument.RenderingSettings.RenderingMode = Vintasoft.Imaging.Pdf.PdfRenderingMode.Normal;

        // create new TIFF file
        using (Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffFile tiffFile = 
            new Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffFile(tiffFileName, 
                Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffFileFormat.LittleEndian))
        {
            // set TIFF compression to Zip
            tiffFile.Pages.EncoderSettings.Compression = 
                Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffCompression.Zip;
            // for each PDF page
            for (int i = 0; i < pdfDocument.Pages.Count; i++)
            {
                // render PDF page and add as image to Tiff file
                tiffFile.Pages.Add(pdfDocument.Pages[i].Render());
                // save changes to TIFF file
                tiffFile.SaveChanges();
            }
        }
    }
}

VB.NET

''' <summary>
''' Converts PDF document to TIFF file using PdfDocument and TiffFile classes.
''' PDF document is rendered with specified resolution.
''' </summary>
Public Shared Sub ConvertPdfToTiff_CustomResolution_TiffFile(pdfFileName As String, tiffFileName As String, dpi As Single)
    ' open existing PDF document
    Using pdfDocument As New Vintasoft.Imaging.Pdf.PdfDocument(pdfFileName)
        ' set resolution
        pdfDocument.RenderingSettings.Resolution = New Vintasoft.Imaging.Resolution(dpi, dpi)

        ' set rendering mode - optimal balance between rendering speed and quality
        pdfDocument.RenderingSettings.RenderingMode = Vintasoft.Imaging.Pdf.PdfRenderingMode.Normal

        ' create new TIFF file
        Using tiffFile As New Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffFile(tiffFileName, Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffFileFormat.LittleEndian)
            ' set TIFF compression to Zip
            tiffFile.Pages.EncoderSettings.Compression = Vintasoft.Imaging.Codecs.ImageFiles.Tiff.TiffCompression.Zip
            ' for each PDF page
            For i As Integer = 0 To pdfDocument.Pages.Count - 1
                ' render PDF page and add as image to Tiff file
                tiffFile.Pages.Add(pdfDocument.Pages(i).Render())
                ' save changes to TIFF file
                tiffFile.SaveChanges()
            Next
        End Using
    End Using
End Sub

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