Pdfファイルから画像へ

Mavenの導入が必要なjarは以下の通りです。

    org.apache.pdfbox
    fontbox
    2.0.1


    org.apache.pdfbox
    pdfbox
    2.0.1

Javaコード:

public static void pdf2Image() throws Exception{
        InputStream ism = null;
        URL url = new URL("http://localhost:9001/static/test1.pdf");
        ism=url.openStream();
        PDDocument doc = PDDocument.load(ism);
        PDFRenderer renderer = new PDFRenderer(doc);
        int pageCount = doc.getNumberOfPages();//TYPE_INT_RGB
        BufferedImage newimage = new BufferedImage(2400, 65500,BufferedImage.TYPE_INT_RGB);
        Graphics2D g = newimage.createGraphics();
        g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP,1f));
        for(int i=0;i