A command-line tool that lets you change gamma in GNOME and Cinnamon (with Wayland). You can also adjust contrast and brightness. It works by creating a color profile with the VCGT table, so that changes are persistent and don't interfere with other settings like night light.
gnome contrast brightness cinnamon gamma icc-profile wayland vcgt change-gamma gamma-adjustments gnome-gamma
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Updated
Feb 27, 2026 - Python