Image printing sometimes prints random characters

When printing a ticket which has a logo, sometimes I get a bunch of random characters.

My code is packaged as an executable jar file My logo image is: 300 px width and 250 px height Thermal printer: Sanbee mini 58 mm Code sample

public class PrintTicket {
    private static BufferedImage logoImage = null;

    public void print(String printerName, List<String> processedData, String totalAmount, String id){
        PrintService printService = PrinterOutputStream.getPrintServiceByName(printerName);
        try {
            EscPos escpos = new EscPos(new PrinterOutputStream(printService));

            printImage(escpos);

            //... 

            escpos.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static void printImage(EscPos escPos) throws IOException {
        if (logoImage == null) {
            logoImage = ImageIO.read(Objects.requireNonNull(PrintTicket.class.getClassLoader()
                    .getResource("images/logo.jpeg")));
        }
        escPos.write(new RasterBitImageWrapper(), new EscPosImage(new CoffeeImageImpl(logoImage), new BitonalThreshold()));
        escPos.feed(1);
    }
}

As you can see I load the image just once the first time it is needed as a “BufferedImage”, my thinking (which was wrong) was that maybe the read operation was causing the issue. Any ideas on this?

[palanganero]

that happens to me too. once in five (more or less) instead of printing the image it prints random characters. But only by usb. By ethernet it always prints well. Is it the fault of my drivers and my printer?: https://postimg.cc/8sNF7BZx

[bruno-dicastro]

I’m facing the same problem, but it’s not related with this library. Did anyone, @AlbertoVillagomez or @palanganero, discovered what is causing this?