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Xcalib
Xcalib is a command to load a colour profile to your monitor.
Strengths [Weaknesses]
Simple
Xcalib is simple and effective colour management software. It does one thing: adjust the colour profile of your display.
Weaknesses [Strengths]
Simple
Xcalib is a simple command. It adjusts the colour profile of your display, and that's all. If you are looking for a graphical control panel that claims to assist you to find the best gamma level based on your own perception, this is probably not the tool for you.
Install
Install xcalib from http://slackbuilds.org.
Usage
Xcalib has two use-cases:
- Load a pre-defined colour profile into your display.
- Adjust the current colour profile of your display.
Load a Colour Profile
To load a colour profile, just invoke xcalib along with the path to your colour profile:
$ xcalib /usr/share/color/icc/eciRGB_v2_profile-2011/eciRGB_v2_ICCv4.icc
Ideally, you will have created a colour profile for your monitor with a colour calibrator like Color Hug, or else managing colour profiles of your screen is probably not doing much good.
To have this happen automatically upon boot, add that command to your ~/.bash_profile file.
Alter a Colour Profile
Make fine adjustments to the current colour profile of your display with a trailing -a or -alter flag. For instance, to boost the blue levels of your current profile:
$ xcalib -blue 1.0 10.0 100.0 -a
Which takes the blue at gamma level 1.0 (1 through 5 are valid), and sets its brightness to 10% and its contrast to 100%.
To lower the blue in the current profile:
$ xcalib -blue 1.0 10.0 60.0 -a
Which takes the blue levels at 1.0 gamme and sets its brightness to 10% but its contrast to 60%.
These settings can be done to -red, -green, or -blue.
Calibration alterations can be re-set with -c or -clear:
$ xcalib -c
To automate xcalib, add an xcalib command to your ~/.bash_profile file.
See Also
OpenColorIO