Split a Multipage Image File Into Separate Files - C# .NET Core

This tutorial shows how to save each page of a multipage image into separate image files in a C# .NET Core application using the LEADTOOLS SDK.

Required Knowledge

Get familiar with the basic steps of creating a project by reviewing the Add References and Set a License tutorial, before working on the Split a Multipage Image File Into Separate Files - C# .NET Core tutorial.

Create the Project and Add LEADTOOLS References

Start with a copy of the project created in the Add References and Set a License tutorial. If you do not have that project, follow the steps in that tutorial to create it.

The references needed depend upon the purpose of the project. References can be added via NuGet packages.

This tutorial requires the following NuGet package:

• Leadtools.Formats.Raster.Common

For a complete list of which DLL files are required for your application, refer to Files to be Included With Your Application.

Set the License File

The License unlocks the features needed for the project. It must be set before any toolkit function is called. For details, including tutorials for different platforms, refer to Setting a Runtime License.

There are two types of runtime licenses:

• Evaluation license, obtained at the time the evaluation toolkit is downloaded. It allows the toolkit to be evaluated.
• Deployment license. If a Deployment license file and developer key are needed, refer to Obtaining a License.

Note

Adding LEADTOOLS NuGet references and setting a license are covered in more detail in the Add References and Set a License tutorial.

Add the Split Image Code

With the project created, the references added, and the license set, coding can begin.

In the Solution Explorer, open Program.cs. Add the following statements to the using block at the top of Program.cs.

using System; 
using System.IO; 
using Leadtools; 
using Leadtools.Codecs; 

In the Program class, add a new string fileName, below the set license code. Set the new string value to the file path containing the multipage image file. Add a new method named SplitFile(string inputFile) to the Program class. Call it in the Main() method after the fileName string value, as shown below.

static void Main(string[] args) 
{ 
   if (!SetLicense()) 
      Console.WriteLine("Error setting license"); 
   else 
      Console.WriteLine("License file set successfully"); 
 
   string multipageFile = @"FILE PATH TO MULTIPAGE IMAGE FILE"; 
   SplitFile(multipageFile); 
} 

Add the code below to the SplitFile() method to load each page individually from a multipage image file and export the page as its own image file.

static void SplitFile(string inputFile) 
{ 
   using (RasterCodecs codecs = new RasterCodecs()) 
   { 
      int totalPages = codecs.GetTotalPages(inputFile); 
      for (int page = 1; page <= totalPages; page++) 
      { 
         string outputFile = $@"C:\LEADTOOLS21\Resources\Images\{Path.GetFileNameWithoutExtension(inputFile)}_page{page}.png"; 
         using (RasterImage image = codecs.Load(inputFile, page)) 
            codecs.Save(image, outputFile, RasterImageFormat.Png, 0); 
      } 
   } 
} 

Note

To test the code above, use a multipage file, such as TIFF or PDF. If such file is not available, create one by following the Create a Multipage File from Multiple Images Tutorial.

Because the RasterCodecs class implements IDisposable, make sure it is in a using statement for proper disposal.

Run the Project

Run the project by pressing F5, or by selecting Debug -> Start Debugging.

If the steps were followed correctly, the console appears and the application creates new PNG image files from each page of the multipage image file.

Wrap-up

This tutorial showed how to add the necessary references to load all the pages of a TIFF image file and split them into separate PNG images using the RasterImage and RasterCodecs classes.

See Also

• LEADTOOLS RasterImage Documentation
• LEADTOOLS RasterCodecs Documentation
• LEADTOOLS SDK Download Link