Black Light


Black Light 2.0 → $6.99 on Store or Mac App Store
For OS X 10.6.6 and later. Released December 18, 2013.

Note: Black Light Screen Saver is now retiered as it can no longer run with OS X 10.9 Mavericks.


With Black Light you can apply a combination of visual effects to your screen by manipulating the gamma curve. Opening Black Light will automatically apply the selected effects. Quitting the application will restore the original settings.

You can toggle the selected effect combination by clicking on the Black Light icon in the dock, by using a global hotkey, or through the optional Black Light menu icon that can appear on the right side of the menu bar. (Note: this last option is only available with OS X 10.7 or later.)

Invert Screen
Reverse blacks and whites, giving you a negative of the image on your screen.
Replace white grays with white to remove stripes, making white the background of most windows. Ligher colors might change hue slightly.
HDTV Luminance Adjustment
Adapt image for the 16–235 luminance range used by some high-definition television sets when connected by HDMI. Normally, your computer should be capable of automatically adusting output values accordingly, but this isn’t always possible when the TV is connected through an adapter.
Dim Screen
Reduce screen luminosity by dimming each pixel. Useful to reduce the luminosity of LCD screens beyond the minimal value of the back light.
Color Filter
Simulation of a color filter of a chosen color put in front of the screen.


OS X 10.6.6 Snow Leopard or later. Moving Black Light’s icon from the dock to the right side of the menu bar requires OS X 10.7 Lion or later.

For an earlier version of OS X (down to 10.2.8), use [Black Light 1.7.1][v1.7.1].

Known issues

Version History

Black Light 2.0 (16 December 2013)

Black Light 1.8.1 (September 18, 2013)

Black Light 1.8 (1 September 2013)

Black Light 1.7.1 (6 June 2010)

Black Light 1.7 (5 October 2009)

Black Light 1.6 (6 March 2006)

Black Light 1.5

BlackLight 1.1

BlackLight 1.0