XRandR Invert Colors

Simple utility that inverts colors on all screens, using XrandR.

Dependencies

• XrandR development files (apt-get install libxcb-randr0-dev)

Building

From a terminal, type make

Using

Run xrandr-invert-colors.bin for inverting colors on all screens. The follwing program option is implemented:

• -s <crtc_number> : Instead of inverting all screens, invert only the colors of the screen identified by <crtc_number>.
• --help and -h : Print a short help for the program.
• --version : Print a (dummy) version information.
• -d : Enables debug log on standard output. Prints diagonstic messages.

Hint: put the executable in the a directory listed in $PATH, and bind the execution of xrandr-invert-colors.bin to a shortcut key.

Achknowledgements

Redshift developers, for creating the XRandR gamma setting code. Their code is reused in this application. http://jonls.dk/redshift/ https://launchpad.net/redshift

Alternatives

• xcalib -i -a : Inverts the colors of the current screen.
  • Note that as of date of last testing (2014, xcalib version 0.8) xcalib has not been able to invert the colors on all monitors in a multi-monitor setup, because all monitors are presented by the X11 server as a single screen. Thus this limitation is coming from the X11 server. xrandr-invert-colors does not have this limitation, because it uses XRandR API, which correctly handles all attached monitors.

License

GNU GPL v3