functionGRABITExtractsdatapointsfromanimagefile.%%GRABITstartsaGUIprogramforextractingdatafromanimagefile.%ItiscapableofreadinginBMP,JPG,TIF,GIF,andPNGfiles(anything%thatisreadablebyIMREAD).Multipledatasetscanbeextractedfroma%singleimagefile,andthedataissavedasann-by-2