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Converting image to Grayscale without using any methods Java OpenCV.
To convert the colored image to grayscale.
Get the red green blue values of each pixel
Get the average of these 3 colors.
Replace the RGB values with the average.
Create a new pixel value from the modified colors.
Set the new value to the pixel.
Example
import java.io.File;
import java.io.IOException;
import java.awt.Color;
import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;
public class Color2Grey {
public static void main(String args[])throws IOException {
//Reading the image
File file= new File("D:\Images\car.jpg");
BufferedImage img = ImageIO.read(file);
for (int y = 0; y < img.getHeight(); y++) {
for (int x = 0; x < img.getWidth(); x++) {
//Retrieving the values of a pixel
int pixel = img.getRGB(x,y);
//Creating a Color object from pixel value
Color color = new Color(pixel, true);
//Retrieving the R G B values
int red = color.getRed();
int green = color.getGreen();
int blue = color.getBlue();
//Finding the average of the red green blue values
int average = (red+green+blue)/3;
//Creating new Color object
color = new Color(average, average, average);
//Setting new Color object to the image
img.setRGB(x, y, color.getRGB());
}
}
//Saving the modified image
file = new File("D:\Images\grey_image.jpg");
ImageIO.write(img, "jpg", file);
System.out.println("Done...");
}
}Input
Output
Updated on: 09-Apr-2020
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