Load and Save Images - Java

This tutorial shows how to use the LEADTOOLS SDK to create a Java application that loads and saves an image.

Required Knowledge

Before working on the Load and Save an Image - Java tutorial, get familiar with the basic steps of creating a project by reviewing the Add References and Set a License tutorial.

Create the Project and Add LEADTOOLS References

In Eclipse, create a new Java project, and add the necessary LEADTOOLS references.

The references needed depend upon the purpose of the project. The following JAR files are needed for this tutorial:

The JAR files are located at <INSTALL_DIR>\LEADTOOLS21\Bin\Java

• leadtools.jar
• leadtools.codecs.jar

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

Add the Load Image Code

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

In the Package Explorer, open the _Main.java class. Add two new methods to the _Main class called LoadImage(String filename, RasterCodecs codecs) and SaveImage(RasterImage _image, String outputFile, RasterCodecs _codecs). call these methods inside the main() method after the SetLicense() call, putting the load call first.

Add the following import statements to the import block at the top.

import java.io.IOException; 
import java.nio.file.Files; 
import java.nio.file.Paths; 
 
import leadtools.*; 
import leadtools.codecs.*; 

public static void main(String[] args) throws IOException 
{ 
	Platform.setLibPath("C:\\LEADTOOLS21\\Bin\\CDLL\\x64"); 
	Platform.loadLibrary(LTLibrary.LEADTOOLS); 
	Platform.loadLibrary(LTLibrary.CODECS); 
		 
	SetLicense(); 
		 
	RasterCodecs codecs = new RasterCodecs(); 
	String inputFile = "C:\\LEADTOOLS21\\Resources\\Images\\image1.cmp"; 
	String outputFile = "C:\\LEADTOOLS21\\Resources\\Images\\test.jpg"; 
	RasterImage image = LoadImage(inputFile, codecs); 
	SaveImage(image, outputFile, codecs); 
} 

Add the below code to load an image from file.

static RasterImage LoadImage(String inputFile, RasterCodecs codecs) 
{ 
	RasterImage _image = codecs.load(inputFile); 
	System.out.println("Image loaded successfully."); 
	return _image; 
} 

Add the below code to save the RasterImage loaded from CMP as a new JPEG file.

static void SaveImage(RasterImage _image, String outputFile, RasterCodecs _codecs) 
{ 
	_codecs.save(_image, outputFile, RasterImageFormat.JPEG, _image.getBitsPerPixel()); 
	System.out.println("Image saved successfully."); 
} 

Run the Project

Run the project by selecting Run -> Run.

If the steps were followed correctly, the application loads the CMP image as a RasterImage and then exports to file as JPEG.

Wrap-up

This tutorial showed how to add the necessary references to load and save an image. Also, it covered how to use the RasterImage and RasterCodecs classes.

See Also

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