If you double your page size before exporting an image of the slide, you will have doubled the ppi/dpi. Another way to get the same effect is with page layout. So basically you can just save your slide as an image and adjust the pixel dimensions of the output (save as picture > options >. So, for example, if you’re image is 100 pixels * 200 pixels and you print it 1 inch by 2 inch, your resolution will be 100 ppi (pixels per inch), but if you print the image 2 inches by 4 inches, it’s only a resolution of 50 ppi. When you save a slide, keep in mind you’re saving an image file (e.g., jpg, gif) and not necessarily a particular size to print or display.
But if you mean a vector graphic (e.g., a slide you created by using the text, shapes, etc within ppt), you can have any resolution. If you mean a drawing/photo that’s in a ppt, you’re unfortunately limited to the resolution of the original image.
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