Java tutorial
import java.awt.Color; import java.io.FileOutputStream; import com.lowagie.text.Document; import com.lowagie.text.Element; import com.lowagie.text.PageSize; import com.lowagie.text.Phrase; import com.lowagie.text.pdf.ColumnText; import com.lowagie.text.pdf.PdfContentByte; import com.lowagie.text.pdf.PdfGState; import com.lowagie.text.pdf.PdfTemplate; import com.lowagie.text.pdf.PdfTransparencyGroup; import com.lowagie.text.pdf.PdfWriter; public class TransparencyPDF { public static void main(String[] args) { Document document = new Document(PageSize.A4, 50, 50, 50, 50); try { PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("TransparencyPDF.pdf")); document.open(); PdfContentByte cb = writer.getDirectContent(); PdfGState gs1 = new PdfGState(); gs1.setFillOpacity(0.5f); cb.setGState(gs1); cb.setColorStroke(Color.black); cb.setColorFill(Color.gray); cb.rectangle(0, 0, 100, 200); cb.fill(); cb.setLineWidth(2); cb.rectangle(0, 0, 200, 200); cb.stroke(); PdfGState gs2 = new PdfGState(); gs2.setFillOpacity(0.1f); cb.setGState(gs2); cb.setColorStroke(Color.black); cb.setColorFill(Color.gray); cb.rectangle(50, 50, 100, 200); cb.fill(); cb.setLineWidth(2); cb.rectangle(50, 50, 200, 200); cb.stroke(); } catch (Exception de) { de.printStackTrace(); } document.close(); } }