How to change the resolution of exported images of powerpoint slides

First, we open the command line. You can type "cmd" in the search window and click the "Command Prompt" in the search results.

Secondly, we open "regedit" to edit register for the relevant section of the Microsoft Powerpoint. You can type "regedit" in the prompt command line.

Next, navigate to "HKEY_CURRENT_USER" => "SOFTWARE" => "Microsoft" => "Office" => "16.0" => "Powerpoint" => Options.

Finally, create new entry named "ExportBitmapResolution" and click enter. Afterwards, right click and modify the Value data by selecting the "Decimal" option and enter the DPI value in the "Value data" section, e.g., 300 in the screenshot below.

Now, you can test to save your Microsoft Powerpoint slides to a set of high quality images (e.g., in JPG format).