Add image water mark on PDF in JAVA using iText

Below code for add image water mark on PDF using iText:

import java.io.FileOutputStream;

import java.io.IOException;

import com.itextpdf.text.DocumentException;

import com.itextpdf.text.Image;

import com.itextpdf.text.Rectangle;

import com.itextpdf.text.pdf.PdfContentByte;

import com.itextpdf.text.pdf.PdfGState;

import com.itextpdf.text.pdf.PdfReader;

import com.itextpdf.text.pdf.PdfStamper;

public class ImageWaterMarkOnPdf {

public static void main(String... args)   {

try {

PdfReader reader = new PdfReader("originalfilepath/otiginal.pdf");

PdfStamper stamper = new PdfStamper(reader,

new FileOutputStream("outputfilepath/output.pdf"));

// image watermark

Image img = Image.getInstance("watermarkfilepath/watermark.png");

float w = img.getScaledWidth();

float h = img.getScaledHeight();

// properties

PdfContentByte over;

Rectangle pagesize;

float x, y;

// add water mark on all pages

int n = reader.getNumberOfPages();

for (int i = 1; i <= n; i++) {

// get page size and position for add water mark

pagesize = reader.getPageSizeWithRotation(i);

x = (pagesize.getLeft() + pagesize.getRight()) / 2;

y = (pagesize.getTop() + pagesize.getBottom()) / 2;

over = stamper.getOverContent(i);

over.saveState();

// set transparency

PdfGState state = new PdfGState();

state.setFillOpacity(0.2f); //more transparent

over.setGState(state);

// add image water mark center

over.addImage(img, w, 0, 0, h, x - (w / 2), y - (h / 2));

over.restoreState();

}

stamper.close();

reader.close();

}catch (IOException e) {

// TODO: handle exception

}catch (DocumentException e) {

// TODO: handle exception

}

 

}

}