If you have any problems with PowerPoint presentations not compressing properly it might be because of one or more bad images. 1.5 Problem solving powerpoint compression (for. There is no way to set default compression on powerpoint on MacOS (as far as I can tell), you need to do it manually via File>Reduce file size. 1.4 How to check/change the default compression in your powerpoint presentation (MacOS 2011) So if you decide to enlarge an image you have previously shrunk (with a save and close in between) it will have 220ppi resolution at the smaller size. NOTE: 220ppi applies to the smallest size the image has been when the document is saved and closed. I would leave this set at 220ppi (or even check “Do not compress images in this file”) so that images aren’t compressed very much for your working copy.
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