Default Header Picture Size Change

Hello Everybody I just installed version 1.7.1 of Paralax Frame Pro. From the changelog I got the information that the default header image size was changed to 1920x1080. But up to know I created all the header images in the old format 1680x720 causing know an incorrect picture adjustment with the new version. Is there any workaround apart from creating new ones or scale the existing ones by means of wordpress?