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What is the procedure to calibrate the monitor and what software to use?

Edit: I think what I mean is "colour profile" if that's what it is called. I happened to notice that the same photos look very differently indeed on my home laptop and on other computers…

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you mean Gamma settings? –  theTuxRacer Oct 25 '10 at 17:56
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4 Answers

up vote 16 down vote accepted

You can use GNOME Color Manager to install color profiles, perform calibration and adjust color settings. For full functionality, you'll need ICC profiles that provide the required information for your devices.

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Really calibrating a monitor requires a rather expensive piece of hardware though... –  JanC Oct 25 '10 at 20:05
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Not really. The Pantone Huey Pro, which works with GNOME Color Manager, costs $100, which is nothing if you're doing professional work that necessitates proper calibration. –  mgunes Oct 25 '10 at 22:06
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GCM developer Richard Hughes recently announced ColorHug, a colorimeter with open hardware specs and drivers -- hughski.com –  mgunes Nov 22 '11 at 10:33
    
Even the imaging industry standards like the Spyder4 are only around $220 (US). And the Spyder4 works with gcm-calibrate. –  Ian Santopietro Feb 5 at 18:37
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If you don't use unity (or gnome), using gnome-color-manager does NOT work (see How do you set system display color profiles in Xubuntu and Lubuntu? for the glory details).

However, there is an excellent german howto all necessary things manually: http://wiki.ubuntuusers.de/Monitor_profilieren_mit_ArgyllCMS

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To do a colour calibration (this is the process that the 'Calibrate...' button will start) you would need to use a spectrophotometer. These measure the colour produced by monitors or printers.

The basic process is that the screen will display a number of coloured patches one after the other and the spectrophotometer will detect the actual colour produced on the screen. This allows the software to compare the colour produced with the colour that was requested.

After the process is completed Ubuntu will have a profile specifically for that monitor (or printer) that will tell it what colour to request to get the colour that it actually wants.

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I am not sure what you mean by calibrate, so ill take a few stabs.

  1. You can try pressing "Auto" on your monitor, if its an LCD.
  2. YOu can try installing f.lux That will manage your color tint according to the time, and brightness setting.
  3. If none of the above are answers to your question, then try adding a few more detials to your question.

EDIT: after OP added a detail, this should help: type this on a console/terminal.

first, just type xgamma to get the RGB values, in case you want to revert. Then,

xgamma -gamma 0.9 the 0.9 is the gamma value. Try a few diff combinations of RGB.

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f.lux seems like a nice piece of software but I think it is not quite what I need –  kounryusui Oct 25 '10 at 17:55
    
just in case anyone finds this useful: an alternative to f.lux: jonls.dk/redshift –  kounryusui Oct 25 '10 at 21:37
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