In XlsIO, you can explicitly convert the range of the worksheet using ConvertToImage( int firstRow, int firstColumn, int lastRow, int lastColumn )
method. This method will return a single image for the entire specified range. To convert an image page-wise, you must create a custom method which calculates number of rows to be converted based on row height so that array of images will be converted for entire range.
Please refer our UG Documentation for Worksheet to Image conversion from the below link.
Documentation link: http://help.syncfusion.com/file-formats/xlsio/conversions#convert-worksheet-to-image
Please let us know if you have any concerns.