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Windows Photo Viewer Disable DPI Scaling (Slideshow High DPI problem)

When viewing a slideshow (fullscreen) (F11) with Windows photo viewer at 150% DPI Scaling on a 4K monitor only part of the image is shown! The DPI scaling should be ignored when fullscreen. Anyone knows how to fix this bug??

The strange thing is that with PNG and JPG images Photo Viewer starts with DPI scaling.

However when opening a BMP photo viewer starts without DPI scaling and full screen slideshow works fine.

So a better question would be how to always start photo viewer without DPI scaling.

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Unfortunately it's a dll and compatibility settings are not available...

Answer
Answer

I found a fix but I don't know if it impacts other programs so use with caution:

Add the following registry key:

"C:\Windows\System32\rundll32.exe"

to

[HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Layers]

and set its value to "HIGHDPIAWARE"

(above without quotes)

This disables HIGHDPI scaling for all rundll32 dlls.

Not sure if it's a good idea but it works for me...

[Electronic engineer and a programmer]

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Question Info

Last updated October 22, 2023 Views 6,611 Applies to: