I have a ppsx file with images that I want usable in other environments than office suites: it would be perfect having them as separate images. I could then use them directly; or create a pdf from them (I find easy converting images to pdf and extracting images from pdf). Or may it is possible to convert the ppsx file into pdf with a command or GUI?
LibreOffice supports exporting of presentations to pdf format.
All you have to do is open the presentation in Libreoffice (Impress, the PowerPoint equivalent), then go to