How to Change the Resolution of a Slide That You Export as a Picture in PowerPoint
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Overview: This paper from Microsoft describes how to change the resolution dots-per-inch (the dpi settings) of exported slides by adding a new registry value for Microsoft Office PowerPoint 2003 or for Microsoft Office PowerPoint 2007. Additionally, this article describes how to export a slide as a picture. This article contains information about how to modify the registry. Make sure that one should back up the registry before modifying it.