I need to show my desktop in gray-scale mode.
On MacOS I can do it in accessibility mode. I tried with
compiz config but the color filter was removed from Ubuntu 14.04.
Who can help me?
I use Ubuntu 14.04 with Unity.
You can use the Opacity, Brightness & Saturation plug-in.
Add new rule:
I got all windows in grayscale only unity dash & top panel still in color, may be needs a reboot. :) sorry not the time to test that.
BTW, it is possible to get a hardware solution for VGA with just few resistors to make an RGB channels merger/mixer.
I think you can achieve what you want with xcalib If it's not installed:
sudo apt-get install xcalib
try something like
xcalib -i -a xcalib -invert -alter xcalib -co 70 -a
To reset screen
For more info about xcalib check out http://manpages.ubuntu.com/manpages/precise/man1/xcalib.1.html
Following link may also help out How can Ubuntu be made grayscale?