Set powerpoint to save pictures to higher resolution images.

Описание: Note always do backups before editing the registry.

In the Registry Editor goto

HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\PowerPoint\Options (Note the version of office you have)
Right click and add new dword
Typed exactly as

ExportBitmapResolution

Then open and select Decimal
And enter 300
That sets powerpoint to export pictures to 300 dpi instead of 96 default.

Now also create new dword as below.

AutomaticPictureCompressionDefault

Setting to 0 will disable compression & PowerPoint will not reduce the resolution or quality of the images you insert into your presentation.
Must reboot for changes to start working.