InputStream in = new FileInputStream(imagePath);
            BufferedImage bimg = ImageIO.read(in);

            float width = bimg.getWidth() ;
            float height = bimg.getHeight();
            PDPage page = new PDPage(new PDRectangle(width, height));

            doc.addPage(page);
            //PDStream stream = new PDStream(doc, in);

            PDImageXObject  pdImageXObject = JPEGFactory.createFromImage(doc, bimg, 0.5f, 10);

            PDPageContentStream contentStream = new PDPageContentStream(doc, page);

            contentStream.drawImage(pdImageXObject, 0, 0);

            contentStream.close();
        }
    }
    finally
    {
        System.out.println("ddd");
        doc.save(pdfPath);
        doc.close();
    }
}

PDPage page = new PDPage(new PDRectangle(width / 300 * 72, height / 300 * 72));

float scale = 72 / 300;
contentStream.drawImage(pdImage, 0, 0, pdImage.getWidth()*scale, pdImage.getHeight()*scale);