Create a negative image

Creating negative of a an image is pretty simple. Let’s have a look at each color component values. Each color component value lies between 0-255. We want opposite value of each color component. Let’s say a color component e.g. red / green / blue has a value of 255 and we want its opposite that is 0. if color component value is 100 then we want a color component value 100 lesser then the full color that is 255-100 = 155.
Retrieve red color component and opposite current value

int oppositRed = 255-pixelArray[index].getRed();

Retrieve green color component and opposite current value

int oppositGreen = 255-pixelArray[index].getGreen();

Retrieve Blue color component and opposite current value

int oppositBlue = 255-pixelArray[index].getBlue();

Here is the method that really works and have a look at images displayed below. It really works

// Create negative of original image
	public void createNegative() {
		// Get all pixel
		Pixel[] pixelArray = this.getPixels();

		// Iterate through all pixel
		for (int index = 0; index < pixelArray.length; index++) {

			// get the current pixel color, opposite color and create a new color object
			Color color = new Color(255 - pixelArray[index].getRed(), 255 - pixelArray[index].getGreen(),
					255 - pixelArray[index].getBlue());

			// set new color
			pixelArray[index].setColor(color);
		}
	}