How can I invert colors in Powerpoint slides?

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To print college lecture slides with a black background in .ppt format while minimizing ink usage, changing the global background color is a viable option. However, this may not address the issue of yellow text and drawing objects scattered throughout the slides. A more efficient solution would be to invert all colors globally in the presentation, which would allow for better visibility and reduced ink consumption. Resources are available online that provide guidance on how to invert colors in PowerPoint, which can facilitate this process and improve print quality.
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My girlfriend wants to print her college lecture slides that she has in .ppt format. The backgrounds of the slides are black, so this will take a lot of ink. I can change the global background color easily by modifying the theme, but there are yellow drawing objects and text that is all over several slides. It would be MUCH easier to handle if I had a way to simply invert all of the colors globally. Any ideas?
 
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