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How to convert a colored image to grayscale using Java OpenCV library?
The cvtColor() method of the Imgproc class changes/converts the color of the image from one to another. This method accepts three parameters −
src − A Matrix object representing source.
dst − A Matrix object representing the destination.
code − An integer value representing the color of the destination image.
To convert a colored image to grayscale you need to pass Imgproc.COLOR_RGB2GRAY as the third parameter to this method.
Example
import org.opencv.core.Core; import org.opencv.core.Mat; import org.opencv.imgcodecs.Imgcodecs; import org.opencv.imgproc.Imgproc; public class ColorToGrayscale { public static void main(String args[]) throws Exception { //Loading the OpenCV core library System.loadLibrary( Core.NATIVE_LIBRARY_NAME ); //Reading the image Mat src = Imgcodecs.imread("spiderman.jpg"); //Creating the empty destination matrix Mat dst = new Mat(); //Converting the image to grey scale Imgproc.cvtColor(src, dst, Imgproc.COLOR_RGB2GRAY); //Instantiating the Imagecodecs class Imgcodecs imageCodecs = new Imgcodecs(); //Writing the image imageCodecs.imwrite("colortogreyscale.jpg", dst); System.out.println("Image Saved"); } }
Input
Output
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