Performance Improvement while converting TIFF to PDF

Aspose.Pdf allows you to add TIFF images to a PDF file. However, sometimes it takes too much time when we try to save the created PDF document. However, ImageInfo class provides a property named IsBlackWhite which can be set to true to force a TIFF image to be black and white. This will improve the performance between 70 to 80 %. Following are the code snippets which will help you understand how we can use this property while adding Tiff images to PDF.

[C#]

string baseDir = @"C:\TiffImages";

string outDir = @"C:\OutDir\";

//get a list of tiff image files

string[] files = System.IO.Directory.GetFiles(baseDir);

//Instantiate a Pdf object

Pdf pdf1 = new Pdf();

//navigate through the files and them in the pdf file

foreach (string myFile in files)

{

//Load all tiff files in byte array

FileStream fs = new FileStream(myFile, FileMode.Open, FileAccess.Read);

byte[] tmpBytes = new byte[fs.Length];

fs.Read(tmpBytes, 0, Convert.ToInt32(fs.Length));

MemoryStream mystream = new MemoryStream(tmpBytes);

Bitmap b = new Bitmap(mystream);

//Create a new section in the Pdf document

Section sec1 = new Section(pdf1);

// Set margins so image will fit, etc.

sec1.PageInfo.Margin.Top = 5;

sec1.PageInfo.Margin.Bottom = 5;

sec1.PageInfo.Margin.Left = 5;

sec1.PageInfo.Margin.Right = 5;

sec1.PageInfo.PageWidth = (b.Width / b.HorizontalResolution) * 72;

sec1.PageInfo.PageHeight = (b.Height / b.VerticalResolution) * 72;

//Add the section in the sections collection of the Pdf document

pdf1.Sections.Add(sec1);

//Create an image object

Aspose.Pdf.Image image1 = new Aspose.Pdf.Image(sec1);

//Add the image into paragraphs collection of the section

sec1.Paragraphs.Add(image1);

image1.ImageInfo.ImageFileType = ImageFileType.Tiff;

// set IsBlackWhite property to true for performance improvement

image1.ImageInfo.IsBlackWhite = true;

//Set the ImageStream to a MemoryStream object

image1.ImageInfo.ImageStream = mystream;

//Set desired image scale

image1.ImageScale = 0.95F;

}

//Save the Pdf

pdf1.Save(outDir + "OutputFile.pdf");

[VB.NET]

Dim baseDir As String = "C:\TiffImages"

Dim outDir As String = "C:\OutDir\"

'get a list of tiff image files

Dim files As String() = System.IO.Directory.GetFiles(baseDir)

'Instantiate a Pdf object

Dim pdf1 As New Pdf()

'navigate through the files and them in the pdf file

Dim myFile As String

For Each myFile In files

'Load all tiff files in byte array

Dim fs As New FileStream(myFile, FileMode.Open, FileAccess.Read)

Dim tmpBytes As Byte() = New Byte(fs.Length - 1) {}

fs.Read(tmpBytes, 0, Convert.ToInt32(fs.Length))

Dim mystream As New MemoryStream(tmpBytes)

Dim b As New Bitmap(mystream)

'Create a new section in the Pdf document

Dim sec1 As New Section(pdf1)

'Set margins so image will fit, etc.

sec1.PageInfo.Margin.Top = 5

sec1.PageInfo.Margin.Bottom = 5

sec1.PageInfo.Margin.Left = 5

sec1.PageInfo.Margin.Right = 5

sec1.PageInfo.PageWidth = (b.Width / b.HorizontalResolution) * 72

sec1.PageInfo.PageHeight = (b.Height / b.VerticalResolution) * 72

'Add the section in the sections collection of the Pdf document

pdf1.Sections.Add(sec1)

'Create an image object

Dim image1 As New Aspose.Pdf.Image(sec1)

'Add the image into paragraphs collection of the section

sec1.Paragraphs.Add(image1)

image1.ImageInfo.ImageFileType = ImageFileType.Tiff

'set IsBlackWhite property to true for performance improvement

image1.ImageInfo.IsBlackWhite = True

'Set the ImageStream to a MemoryStream object

image1.ImageInfo.ImageStream = mystream

'Set desired image scale

image1.ImageScale = 0.95F

pdf1.Save(outDir + "OutputFile.pdf")