I didn’t realise that this was an unknown to many but often there is a need to pull things out of PowerPoint for alternative uses rather than put them in. This is often the case for me when produce video reports where the findings have been visualised in PowerPoint. So, it’s as simple as this, File > Save As > under the naming form fill change the drop down to png or jpg and hit save, you will then be prompted current slide or every slide, choose every slide and each slide in he deck will be saved as a separate picture or image.

If you just require an element if the slide you can right click and save as image in much the same way.

Top tip,
If your output proposed use is a higher quality than the resolution of the ppt you can often scale up your deck to A3, any vector graphics will be re sized and the quality of the output increased. Go, File > Page Setup and adjust the page accordingly.