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Poster in PowerPoint

Resolution

By default, PowerPoint may down-sample images. To stop this, change the settings in Options:

then

To save PNG/jpeg files in higher resolution, use this registry fix:

https://support.microsoft.com/en-us/help/827745/how-to-change-the-export-resolution-of-a-powerpoint-slide

HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\PowerPoint\Options

Click the Options subkey, point to New on the Edit menu, and then click DWORD Value.
Type ExportBitmapResolution, and then press Enter.
Make sure that ExportBitmapResolution is selected, and then click Modify on the Edit menu.
In the Edit DWORD Value dialog box, click Decimal.

In the Value data box, type the value of the resolution that you want such as 300. Or, use the parameters in the following table.

Decimal value	Full-screen pixels (horizontal × vertical)	Widescreen pixels (horizontal × vertical)	Dots per inch (horizontal and vertical)
50	500 × 375	667 × 375	50 dpi
96 (default)	960 × 720	1280 × 720	96 dpi
100	1000 × 750	1333 × 750	100 dpi
150	1500 × 1125	2000 × 1125	150 dpi
200	2000 × 1500	2667 × 1500	200 dpi
250	2500 × 1875	3333 × 1875	250 dpi
300	3000 × 2250	4000 × 2250	300 dpi

Note See the Limitations section for more information when you set this value.

Size

Under the Design tab, go to Slide Size

Enter the slide size

Note that the largest size PowerPoint will do is 56", so you may need to scale down larger sizes.

Slide Sorter View

With PowerPoint, Alt + V, then:

D to go to the slide sorter
L to go back to the normal view

You could also add the slide sorter and normal view to the "quick access toolbar", and then access them with Alt + 3, Alt + 4 (depends on the order of the toolbar).

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