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PD4ML: PDF Document Watermarking

 

To watermark resulting document PD4ML uses PD4PageMark class, primarily used for definition of page headers and footers.

If areaHeight attribute of a class object is not set to any positive value, it defines no header, no footer. In the case the instance can be used for pure watermarking. Of course you may combine both: watermark and header definitions.

PD4ML API has 2 methods, which accept PD4PageMark objects as parameter; you may define 2 watermark images for resulting documents if needed.

PD4PageMark.setWatermark() method allows you to control image opacity. Technically speaking, it embeds to PDF an image and adds to it a soft mask to it.

Important to know: Adobe Acroread uses different page rendering algorithms depending if a particular PDF page has images with soft masks (alpha channels) or does not. In a case of watermarks it definitely has. For some strange reasons an existence of a soft mask makes font glyphs appear with rough edges (it does not impact print output - it is only a problem of screen view).


package samples;;

import java.awt.Insets;
import java.awt.Rectangle;
import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.security.InvalidParameterException;

import org.zefer.pd4ml.PD4Constants;
import org.zefer.pd4ml.PD4ML;
import org.zefer.pd4ml.PD4PageMark;

public class PD4Watermarks {
	protected int topValue = 10;
	protected int leftValue = 20;
	protected int rightValue = 10;
	protected int bottomValue = 10;
	protected int userSpaceWidth = 1300;

	public static void main(String[] args) {
		try {
			PD4Watermarks jt = new PD4Watermarks();
			jt.doConversion("http://pd4ml.com/sample.htm", "c:/pd4ml.pdf");
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	public void doConversion( String url, String outputPath ) 
					throws InvalidParameterException, MalformedURLException, IOException {
			File output = new File(outputPath);
			java.io.FileOutputStream fos = new java.io.FileOutputStream(output);

			PD4ML pd4ml = new PD4ML();
			pd4ml.setHtmlWidth(userSpaceWidth);
			pd4ml.setPageSize(pd4ml.changePageOrientation(PD4Constants.A4));
			pd4ml.setPageInsetsMM(new Insets(topValue, leftValue, bottomValue, rightValue));
			pd4ml.useTTF("c:/windows/fonts", true);

			PD4PageMark footer = new PD4PageMark();
			footer.setWatermark(
					// watermark image location URL. 
					// For local images use "file:" protocol i.e. "file:images/logo.png"
					"http://pd4ml.com/i/logo.png", 
					// watermark image position
					new Rectangle(10,10,300,200),  
					// watermark opacity in percents
					30);                           							
			pd4ml.setPageFooter(footer); 
			// or pd4ml.setPageHeader(footer); which takes the same effect by watermarking
			
			pd4ml.render(new URL(url), fos);
			fos.close();
			
			System.out.println( outputPath + "\ndone." );
	}
}


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