Decreasing dynamic range, increasing the contrast, is trivial. But once the dynamic range has been compressed, you can't get it back.

You can always tomemap towards more contrast, but never back towards more dynamic range.

> Decreasing dynamic range, increasing the contrast, is trivial.

How would I do this on MacOS or Windows?

Most people have one adjustment easily available--the screen brightness setting. This setting can decrease the contrast of pure black/white text, but it cannot increase the contrast of off-black/white text. Same with the Night Light setting on Windows 11.

> How would I do this on MacOS or Windows?

Ideally you'd create a proper icc profile for your monitor. The ideal way is to use a calibration device, but both OS have a wizard where you can manually adjust contrast and brightness and generate a profile out of that.

This can be used to both increase or decrease contrast.