// Load Excel file
Workbook workbook = new Workbook("workbook.xlsx");

// Create an object of ImageOrPrintOptions
ImageOrPrintOptions imgOptions = new ImageOrPrintOptions();

// Set the output image type
imgOptions.setImageType(ImageType.PNG);

// Get the first worksheet
Worksheet sheet = workbook.getWorksheets().get(0);

// Create a SheetRender object for the target sheet
SheetRender sr = new SheetRender(sheet, imgOptions);

for (int page = 0; page < sr.getPageCount(); page++) {
	// Generate an image for the worksheet
	sr.toImage(page, "image" + page + ".png");
}