calibrate screen, gnome color manager (calibrate button disabled)

I recently noticed that the white on my ubuntu is not exactly white, its redish. Now since I found about it, it is bugging me. How can I calibrate my screen so that white on my ubuntu is same as white on my windows.

I tried gnome color manager but cant calibrate. I am not able to use any of the color calibrators?

I have nvidia 820M and intel 5500HD graphics.

Solution 1:

Since you have an Nvidia GPU, you can use Nvidia X Server Settings to create your own color correction settings.

1. Install Nvidia X Server Settings:

   $ sudo apt-get install nvidia-settings
   

2. Launch:

   $ nvidia-settings
   

3. Find the Color Correction tab for the display you wish to calibrate (under "GPU 0 - (Quadro FX 2700M) -> DFP-0 - (LGD)" in the following screenshot):

4. Select the color channel you wish to change using the Active Color Channel selector, then modify the Brightness, Contrast, and Gamma as you see fit.

Solution 2:

Have you looked at redshift? Although designed for a different purpose, it does have features for setting the colour temperature of your screen.

sudo apt-get install redshift

This is my config file ~/.config/redshift.conf:

[redshift]
temp-day=5700
temp-night=4600
brightness-day=1.0
brightness-night=0.75
gamma=0.8
adjustment-method=vidmode
location-provider=manual

[manual]
lat=63.81415
lon=20.41742

redshift modifies the colour temperature by the time-of-day. If you set temp-day and temp-night to the same colour, you disable this feature. Perhaps that solution will work for you.

If you do want the colour temperature to change at night, you would obviously need to change lat/long.

If you want redshift to autostart at login, select Applications/System tools/Preferences/Startup applications/Add. Name: redshift. Command: /usr/bin/redshift.