This tutorial shows how to use the LEADTOOLS SDK to create a C# .NET Core Console application that uses the RasterCodecs
and RasterImage
classes to load and save an image file.
Overview | |
---|---|
Summary | This tutorial covers how to use the RasterCodecs Class in a C# .NET Core Console application. |
Completion Time | 30 minutes |
Visual Studio Project | Download tutorial project (1 KB) |
Platform | C# .NET Core Console application |
IDE | Visual Studio 2017, 2019 |
Development License | Download LEADTOOLS |
Try it in another language |
|
Before working on the Load and Save Images - .NET Core tutorial, get familiar with the basic steps of creating a project by reviewing the Add References and Set a License Tutorial tutorial.
Start with a copy of the project created in the Add References and Set a License Tutorial tutorial. If you do not have that project, follow the steps in that tutorial to create it.
This tutorial requires the following NuGet package:
Leadtools.Formats.Raster.Common
For a complete list of which Codec DLLs are required for specific formats, refer to File Format Support.
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:
Note
How to properly add LEADTOOLS NuGet references is covered in the Add References and Set a License tutorial.
With the project created, the references added, and the license set, coding can begin.
In the Solution Explorer, open Program.cs
and the following statements to the using
block at the top of Program.cs
:
// Using block at the top
using System;
using System.IO;
using Leadtools;
using Leadtools.Codecs;
In the Program class add a new method called LoadImage(string filename)
, and call it in the Main
method after the SetLicense
method. This tutorial uses the following test image C:\LEADTOOLS21\Resources\Images\image1.cmp
static void Main(string[] args)
{
if (!SetLicense())
{
Console.WriteLine("Error setting license");
return;
}
RasterImage image = LoadImage(@"C:\LEADTOOLS21\Resources\Images\image1.cmp");
}
Add the below code to load the image. The using
statement is recommended because the RasterCodecs
class implements IDisposable
, which causes proper disposal with using
statements.
static RasterImage LoadImage(string filename)
{
using (RasterCodecs codecs = new RasterCodecs())
return codecs.Load(filename);
}
In the Program class, add a new method called SaveImage(RasterImage image, string outputFilename)
, and call it in the Main
method after the LoadImage
method.
static void Main(string[] args)
{
if (!SetLicense())
{
Console.WriteLine("Error setting license");
return;
}
RasterImage image = LoadImage(@"C:\LEADTOOLS21\Resources\Images\image1.cmp");
SaveImage(image, @"C:\LEADTOOLS21\Resources\Images\output.jpg");
Console.WriteLine("Press any key to exit...");
Console.ReadKey(true);
}
Add the below code to export the image as JPEG to the following file path: C:\LEADTOOLS21\Resources\Images\output.jpg
static void SaveImage(RasterImage image, string outputFilename)
{
using (RasterCodecs codecs = new RasterCodecs())
codecs.Save(image, outputFilename, RasterImageFormat.Jpeg, 0);
}
Run the project by pressing F5, or by selecting Debug -> Start Debugging.
If the steps were followed correctly, the application runs and creates a new file in the output location specified in the save call.
This tutorial showed how to use the RasterCodecs
and RasterImage
classes to load and save images in a .NET Core Console Application.