Java | Converting an Image into Grayscale using cvtColor()
Last Updated :
21 Mar, 2024
To convert a color image to Grayscale image using OpenCV, we read the image into BufferedImage and convert it into Mat Object.
Syntax:
File input = new File("digital_image_processing.jpg");
BufferedImage image = ImageIO.read(input);
To transform the image from RGB to Grayscale format by using method cvtColor() in the Imgproc class.
Syntax: Imgproc.cvtColor(source mat, destination mat1, Imgproc.COLOR_RGB2GRAY); Parameters: The method cvtColor() takes three parameters which are the source image matrix, the destination image matrix, and the color conversion type.
Java
// Java program to convert a color image to gray scale
import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;
public class GeeksforGeeks {
public static void main(String args[]) throws Exception
{
// To load OpenCV core library
System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
String input = "C:/opencv/GeeksforGeeks.jpg";
// To Read the image
Mat source = Imgcodecs.imread(input);
// Creating the empty destination matrix
Mat destination = new Mat();
// Converting the image to gray scale and
// saving it in the dst matrix
Imgproc.cvtColor(source, destination, Imgproc.COLOR_RGB2GRAY);
// Writing the image
Imgcodecs.imwrite("C:/opencv/GeeksforGeeks.jpg", destination);
System.out.println("The image is successfully to Grayscale");
}
}
Input :
Output :
Like Article
Suggest improvement
Share your thoughts in the comments
Please Login to comment...