I am seeking recommendations for Windows software that will automatically decrease the brightness of the desktop background image (wallpaper).

The backgrounds images are set to be shown as a slideshow by Windows.

The software needs to be gratis.

The software must be compatible with Windows 7. Compatibility with Windows 8, 8.1, and/or 10 is a plus, but not required.

I prefer open-source and portable software, but neither are hard requirements.

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