How to convert a positive image to Negative to using OpenCV library?

Algorithm to convert an image to negative

• Get the red green blue values of each pixel

• Subtract each color value from 255 and save them as new color values.

• Create a new pixel value from the modified colors.

• set the new value to the pixel.

Implementation in Java

• Read the required image using ImageIO.read() method.

• Get the height and width of the image.

• Using nested for loops traverse through each pixel in the image.

• Get the pixel value using the getRGB() method.

• Create a Color object bypassing the above-retrieved pixel value as parameter.

• Get the red, green, blue values from the color object using the getRed(), getGreen() and getBlue() methods respectively.

• Calculate the new red, green and blue values as specified in the algorithm.

• Create a new Color object bypassing the new RGB values as parameters.

• Get the pixel

• Set the new pixel value(s) using the setRGB() method.

Example

import java.io.File;
import java.io.IOException;
import java.awt.Color;
import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;
public class Color2Negative {
   public static void main(String args[])throws IOException {
      //Reading the image
      File file= new File("D:\Images\car3.jpg");
      BufferedImage img = ImageIO.read(file);
      for (int y = 0; y 
Input
Output