Once a picture is inserted within PowerPoint, any manipulations you make to that picture are strictly only on the surface. The appearance of the picture changes on the slide, but the unaltered picture is stored within your PowerPoint presentation. Essentially that’s good because if you make many changes to a picture — and then regret experimenting — then you can just reset your picture rather than starting all over again! There’s one caveat though — the option to reset any picture back to its original form works only if you have not run any compression options for pictures within your presentation.
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