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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 < 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();
//Subtracting RGB from 255 to convert into negative
red = 255-red;
green = 255-green;
blue = 255-blue;
//Creating new Color object
color = new Color(red, green, blue);
int newPixel = color.getRGB();
//Setting new Color object to the image
img.setRGB(x, y, newPixel);
}
}
//Saving the modified image
file = new File("D:\Images\negative_image.jpg");
ImageIO.write(img, "jpg", file);
System.out.println("Done...");
}
}Input
Output
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