I'd really rather not need to manually resize large photos every time I'm about to use one as a slide background in Powerpoint. I've searched all over the internet and have only found articles mentioning that approach and never mentioning the resolution of background images.
I've already tried the "Compress Pictures" feature mentioned here, but it seems not to affect background images. (I know that the large filesize is due to these photos because I tested this by temporarily setting all slide backgrounds to a solid color, and the file size dropped to 1.5 MB.) This is because each of its slides has a different high-resolution image as its background.
I have a 10-slide presentation that is a whopping 234 MB!
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