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Learn how to save a GIF image file that is available in a PowerPoint presentation in high quality by following one of these two methods.
Launch Microsoft PowerPoint, and open the PPTX file for which you want to use a GIF as the background. Select the appropriate slide. Click the "Design" tab, and locate the "Background" section.
Each will give you a different combination of quality and file size, so be sure to try a few to figure out which is best for your GIF-making needs. Here are a few I created using the 1.0, 2.0, and ...