I have been recently given the task of recreating charts and graphs and then bringing them into PPT. Whenever I save them to jpeg or png format and bring them in they look crappy. My boss in convinced that saving them as PDFs and taking a screenshot then bringing those is looks way better...they don't.

I have tried dragging them in right from illustrator and they look great! But there are a few that I drag in and after I save the PPT and open it again they look crappy. They are all from the same Ai file so I don't know why some look fine after saving and some don't.

Any thoughts? Or has anyone every come across this problem before?