How to convert and replace EMF image in word document to PNG with same size?
Syncfusion Essential DocIO is a .NET Word library used to create, read, and edit Word documents programmatically without Microsoft Word or interop dependencies. In .NET Core targeting applications, metafile images (.wmf and *.emf) have some limitations. Internally, if the Word document contains metafile images (.wmf” or *.emf”), Essential DocIO preserves those images as RedX images with the same size as the original metafile images during Word to PDF or Image conversions to avoid pagination issues.
To preserve the expected images in the PDF, we suggest converting the metafile image formats to bitmap image formats (JPEG or PNG) and then performing Word to PDF conversion.
To convert and replace EMF image in word document to PNG of the same size using C#
- Create a new C# console application project in .NET Core.
- Install the Syncfusion.DocIORenderer.Net.Core NuGet package as a reference to your .NET Core applications from NuGet.org.
- Include the following namespace in the Program.cs file.
C#
using Syncfusion.DocIO; using Syncfusion.DocIO.DLS; using Syncfusion.DocIORenderer; using Syncfusion.Pdf; using System.Drawing; using System.Drawing.Imaging;
VB
Imports System.Drawing Imports System.Drawing.Imaging Imports Syncfusion.DocIO Imports Syncfusion.DocIO.DLS Imports Syncfusion.DocIORenderer Imports Syncfusion.Pdf
- Use the following code example to convert and replace EMF image to PNG in the Word to PDF conversion.
C#
//Open the file as a Stream.
using (FileStream docStream = new FileStream(@"../../../SyncfusionConvertWordToPdfIssueDoc.docx", FileMode.Open, FileAccess.Read))
{
//Load a file stream into a Word document.
using (WordDocument wordDocument = new WordDocument(docStream, FormatType.Automatic))
{
ConvertEMFToPNG(wordDocument);
//Instantiation of DocIORenderer for Word to PDF conversion.
DocIORenderer render = new DocIORenderer();
//Convert a Word document into a PDF document.
using (PdfDocument pdfDocument = render.ConvertToPDF(wordDocument))
{
//Save the PDF file.
using (FileStream outputFile = new FileStream("Output.pdf", FileMode.OpenOrCreate, FileAccess.ReadWrite))
pdfDocument.Save(outputFile);
}
}
}
VB
'Open the file as a Stream
Using docStream As FileStream = New FileStream("../../../SyncfusionConvertWordToPdfIssueDoc.docx", FileMode.Open, FileAccess.Read)
'Load a file stream into a Word document
Using wordDocument As WordDocument = New WordDocument(docStream, FormatType.Automatic)
ConvertEMFToPNG(wordDocument)
'Instantiation of DocIORenderer for Word to PDF conversion
Dim render As DocIORenderer = New DocIORenderer
'Convert a Word document into a PDF document
Using pdfDocument As PdfDocument = render.ConvertToPDF(wordDocument)
'Saves the PDF file
Using outputFile As FileStream = New FileStream("Output.pdf", FileMode.OpenOrCreate, FileAccess.ReadWrite)
pdfDocument.Save(outputFile)
End Using
End Using
End Using
End Using
- Use the following helper method to convert EMG image format to PNG format with the same size.
C#
private static void ConvertEMFToPNG(WordDocument wordDocument)
{
//Find all images by EntityType in Word document.
List<Entity> images = wordDocument.FindAllItemsByProperty(EntityType.Picture, null, null);
//Replace EMF with PNG images.
for (int i = 0; i < images.Count; i++)
{
WPicture picture = images[i] as WPicture;
//Convert EMG image format to PNG format with the same size.
Image image = Image.FromStream(new MemoryStream(picture.ImageBytes));
if (image.RawFormat.Equals(ImageFormat.Emf) || image.RawFormat.Equals(ImageFormat.Wmf))
{
float height = picture.Height;
float width = picture.Width;
FileStream imgFile = new FileStream("Output.png", FileMode.OpenOrCreate, FileAccess.ReadWrite);
image.Save(imgFile, ImageFormat.Png);
imgFile.Dispose();
image.Dispose();
FileStream imageStream = new FileStream(@"Output.png", FileMode.Open, FileAccess.ReadWrite);
picture.LoadImage(imageStream);
picture.LockAspectRatio = false;
picture.Height = height;
picture.Width = width;
imageStream.Dispose();
}
}
}
VB
Private Sub ConvertEMFToPNG(ByVal wordDocument As WordDocument)
'Find all images by EntityType in Word document.
Dim images As List(Of Entity) = wordDocument.FindAllItemsByProperty(EntityType.Picture, Nothing, Nothing)
'Replace EMF with PNG images.
For i = 0 To images.Count - 1
Dim picture As WPicture = TryCast(images(i), WPicture)
'Convert EMG image format to PNG format with the same size.
Dim image As Image = Image.FromStream(New MemoryStream(picture.ImageBytes))
If image.RawFormat.Equals(ImageFormat.Emf) OrElse image.RawFormat.Equals(ImageFormat.Wmf) Then
Dim height As Single = picture.Height
Dim width As Single = picture.Width
Dim imgFile As FileStream = New FileStream("Output.png", FileMode.OpenOrCreate, FileAccess.ReadWrite)
image.Save(imgFile, ImageFormat.Png)
imgFile.Dispose()
image.Dispose()
Dim imageStream As FileStream = New FileStream("Output.png", FileMode.Open, FileAccess.ReadWrite)
picture.LoadImage(imageStream)
picture.LockAspectRatio = False
picture.Height = height
picture.Width = width
imageStream.Dispose()
End If
Next
End Sub
A complete working example in C# can be downloaded from GitHub.
By executing the program, you will get the output PDF document as follows.
Note:
Conclusion
I hope you enjoyed learning about how to convert and replace EMF image in word document to PNG with same size in ASP.NET Core File Format Libraries.
You can refer to our File Formats Libraries feature tour page to know about its other groundbreaking feature representations and documentation, and how to quickly get started for configuration specifications. You can also explore our PDF example to understand how to create and manipulate data in the .NET PDF.
For current customers, you can check out our Document processing libraries from the License and Downloads page. If you are new to Syncfusion, you can try our 30-day free trial to check out our .NET Core Controls.
If you have any queries or require clarifications, please let us know in the comments section below. You can also contact us through our support forums, Direct-Trac, or feedback portal. We are always happy to assist you!
Take a moment to peruse the documentation, where you can find the basic Word document processing options along with the features like mail merge, merge and split documents, find and replace text in the Word document, protect the Word documents, and most importantly PDF and Image conversions with code examples.
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