JasperReports with barcode Code128 (Barcode4J): PNG is different from PDF

Question

I am printing a label with the following number "1000049722ABCD2F" as a barcode using the Jasper template and the barcode "Code128" from Barcode4J. Printed as a PDF, the barcode is perfect and scannable. Printing the same barcode as a PNG file, the barcode is not scanned and, obviously, differs from the PDF barcode :

Same barcode: PDF (top of image) and PNG (bottom of image):

The following code is used to create a PDF barcode :

    byte[] data = JasperExportManager.exportReportToPdf(jasperPrint);

To generate PNG is not so simple :

    ByteArrayOutputStream byteOutputStream = new ByteArrayOutputStream();
    ImageOutputStream imageOutputStream = ImageIO.createImageOutputStream(byteOutputStream);
    ImageWriter imageWriter = ImageIO.getImageWritersBySuffix("png").next();
    imageWriter.setOutput(imageOutputStream);

    float zoom = getZoomFactor(jasperPrint);

    BufferedImage image = new BufferedImage(
            (int)(jasperPrint.getPageWidth() * zoom ) + 1,
            (int)(jasperPrint.getPageHeight() * zoom) + 1,
            BufferedImage.TYPE_INT_RGB);

    JRGraphics2DExporterNoAntialias exporter = new JRGraphics2DExporterNoAntialias();
    exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
    exporter.setParameter(JRGraphics2DExporterParameter.GRAPHICS_2D, image.getGraphics());
    exporter.setParameter(JRExporterParameter.PAGE_INDEX, Integer.valueOf(page));
    exporter.setParameter(JRGraphics2DExporterParameter.ZOOM_RATIO, new Float(zoom));
    exporter.exportReport();

    IIOMetadata imageMetaData = imageWriter.getDefaultImageMetadata(new ImageTypeSpecifier(image), null);

    // DPI = 200, inch = 25.4
    double dotsPerMilli = 200 / 25.4;

    IIOMetadataNode horiz = new IIOMetadataNode("HorizontalPixelSize");
    horiz.setAttribute("value", Double.toString(dotsPerMilli));

    IIOMetadataNode vert = new IIOMetadataNode("VerticalPixelSize");
    vert.setAttribute("value", Double.toString(dotsPerMilli));

    IIOMetadataNode dim = new IIOMetadataNode("Dimension");
    dim.appendChild(horiz);
    dim.appendChild(vert);

    IIOMetadataNode root = new IIOMetadataNode("javax_imageio_1.0");
    root.appendChild(dim);

    imageMetaData.mergeTree("javax_imageio_1.0", root);

    imageWriter.write(null, new IIOImage(image, null, imageMetaData), null);
    imageOutputStream.close();
    imageWriter.dispose();
    byte[] data = byteOutputStream.toByteArray();

I use: barcode4j-2.1 / jasperreports-5.0.0 / 200 DPI - the required size for my label printer

(BufferedImage.TYPE-, -, Barbecue-barcode 128B ), - PDF PNG.

: PNG-- , PDF--.

- ? !

Answer 1

ImageWriter, MimeTypes.MIME_PNG org.krysalis.barcode4j.tools.MimeTypes( barcode4j-2.1.jar).

, . stackoverflow:

Barcode4j png

( -) .