Convert a bunch of cells to an image in Java using aspose.cells

Question

I want to convert a few cells (which have made to appear as a chart but are not a chart) to an image using Maven in Java. I have written the below code -

public void celltoImage(String sheetname, int firstrow, int firstcol, int totalrow, int totalcol) throws Exception
    {
        Workbook wb = new Workbook (File1).
        Worksheet sheet = wb.getWorksheets(). get(sheetname).
        //Cells cell = sheet.getCells();
        Range range = sheet.getCells().createRange(firstrow,firstcol,totalrow,totalcol);
        ImageOrPrintOptions options = new ImageOrPrintOptions();
        options.setPrintingPage(PrintingPageType.IGNORE_BLANK);
        options.setImageFormat(ImageFormat.getJpeg());
        SheetRender sheetRender = new SheetRender(range.getWorksheet(), options);
        String imgName=INPATH+sheetname+ ".jpeg";
        OutputStream outputStream = new FileOutputStream(imgName).
        sheetRender.toImage(0, outputStream).
    }

When I am running this, code with the statement - celltoImage("Sheetname",8,4,3,8) I am getting an image starting from 1st cell of the worksheet instead of the cell specified, I5. What am I doing wrong?