Use SpotColor : Pattern « PDF « Java Tutorial

1. Java Tutorial
2. PDF
3. Pattern

import java.awt.Color;
import java.io.FileOutputStream;
import java.io.IOException;

import com.lowagie.text.Document;
import com.lowagie.text.DocumentException;
import com.lowagie.text.pdf.CMYKColor;
import com.lowagie.text.pdf.GrayColor;
import com.lowagie.text.pdf.PdfContentByte;
import com.lowagie.text.pdf.PdfSpotColor;
import com.lowagie.text.pdf.PdfWriter;
import com.lowagie.text.pdf.SpotColor;

public class MainClass {
  public static void main(String[] args) throws Exception {
    Document document = new Document();
      PdfWriter writer = PdfWriter.getInstance(
          document,
          new FileOutputStream("2.pdf"));
      document.open();
      PdfContentByte cb = writer.getDirectContent();
      PdfSpotColor psc_g = new PdfSpotColor("iTextSpotColorGray", 0.5f,
          new GrayColor(0.9f));
      PdfSpotColor psc_rgb = new PdfSpotColor("iTextSpotColorRGB", 0.9f,
          new Color(0x64, 0x95, 0xed));
      PdfSpotColor psc_cmyk = new PdfSpotColor("iTextSpotColorCMYK",
          0.25f, new CMYKColor(0.3f, .9f, .3f, .1f));

      SpotColor sc_g = new SpotColor(psc_g);
      SpotColor sc_rgb1 = new SpotColor(psc_rgb, 0.1f);

      SpotColor sc_cmyk = new SpotColor(psc_cmyk);

      cb.setColorFill(sc_g);
      cb.rectangle(36, 770, 36, 36);
      cb.fillStroke();
      cb.setColorFill(psc_g, psc_g.getTint());
      cb.rectangle(90, 770, 36, 36);
      cb.fillStroke();
      cb.setColorFill(psc_g, 1);
      cb.rectangle(252, 770, 36, 36);
      cb.fillStroke();

      cb.setColorFill(sc_rgb1);
      cb.rectangle(36, 716, 36, 36);
      cb.fillStroke();

      cb.setColorFill(psc_rgb, 0.9f);
      cb.rectangle(36, 662, 36, 36);
      cb.fillStroke();

      cb.setColorFill(sc_cmyk);
      cb.rectangle(36, 608, 36, 36);
      cb.fillStroke();
      cb.setColorFill(psc_cmyk, psc_cmyk.getTint());
      cb.rectangle(90, 608, 36, 36);
      cb.fillStroke();
    document.close();
  }
}