// Create a new workbook.
Workbook workbook = new Workbook();

IWorksheet worksheet = workbook.getWorksheets().get(0);

// Load the image.
InputStream stream = new FileInputStream("Chrome_icon.png");
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
byte[] buffer = new byte[4096];
int bytesRead;
while (true) {
    try {
        if (!((bytesRead = stream.read(buffer)) != -1)) break;
    } catch (IOException e) {
        throw new RuntimeException(e);
    }
    outputStream.write(buffer, 0, bytesRead);
}
byte[] imagebyte = outputStream.toByteArray();

worksheet.getRange("A2:E2").setValue(new String[] { "Stretch", "Center", "Zoom", "None", "Default(Stretch)" });
worksheet.getRange("A3:E3").setValue("Chrome");
worksheet.getRange("A3:E3").setRowHeightInPixel(80);
worksheet.getRange("A3:E3").setColumnWidthInPixel(100);
        
// Add cell background image.
worksheet.getRange("A3:E3").setBackgroundImage(imagebyte);

// Set image layout.
worksheet.getRange("A3").setBackgroundImageLayout(BackgroundImageLayout.Stretch);
worksheet.getRange("B3").setBackgroundImageLayout(BackgroundImageLayout.Center);
worksheet.getRange("C3").setBackgroundImageLayout(BackgroundImageLayout.Zoom);
worksheet.getRange("D3").setBackgroundImageLayout(BackgroundImageLayout.None);

// Set PDF export options.
workbook.getActiveSheet().getPageSetup().setPrintGridlines(true);
workbook.getActiveSheet().getPageSetup().setPrintHeadings(true);
    
// Save to a PDF file.
workbook.save("CellBackgroundImage.pdf");