Difference between revisions of "ICC profiles"

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[http://lprof.sourceforge.net/ LPROF] is an ICC profiler with a graphical user interface listed under [http://aur.archlinux.org/packages.php?ID=8251 lprof] in the Arch User Repository (AUR).  
[http://lprof.sourceforge.net/ LPROF] is an ICC profiler with a graphical user interface listed under [http://aur.archlinux.org/packages.php?ID=8251 lprof] in the Arch User Repository (AUR).  
{{Note|The following walkthrough is extracted from the ArchWiki article [http://lprof.sourceforge.net/help/lprof-help.html Using LPROF to Profile Monitors].|}}
=== Monitor Calibration ===
=== Monitor Calibration ===

Revision as of 02:45, 24 August 2010


As it pertains to general desktop use, an ICC profile is a binary file which contains precise data regarding the color attributes of an input, or output device. [1] Single, or multiple profiles can be applied across a system and its devices to produce consistent and repeatable results for graphic and document editing and publishing. ICC profiles are typically calibrated with a (tristimulus) colorimeter, or a spectrophotometer when absolute color accuracy is required.

[1] ICC Profile. Wikipedia, The Free Encyclopedia. Wikimedia Foundation, Inc. 6 July 2010. Web. 13 Aug. 2010. <http://en.wikipedia.org/wiki/ICC_profile>.

ICC Profile Generation

File Transfer

Profile generation on a Windows 7/Vista/XP, or Mac OS X system is one of the easiest and most widely recommended methods to obtain a ICC monitor profile. Since ICC color profiles are written to an open specification, they are compatible across operating systems. Transferring profiles from one OS to another can be used as a workaround for the lack of support for certain spectrophotometers, or colorimeters under Linux: one can simply produce a profile on a different OS and then use it in a Linux workflow. 2 Recommended colorimeters include the X-Rite i1Display 2 and the Spyder3 Pro. Note that the system on which the profile is generated must host the exact same video card and monitor for which the profile is to be used. Once generation of an ICC profile, or a series of profiles is complete on a Windows 7/Vista/XP system, copy the file(s) from the default path:


Mac OS X generally stores saved ICC profiles in one of two locations:


Once the appropriate .icc files have been copied, install the device profiles to your desired system. Common installation device profiles directories on Linux include:

Note: Ensure that the calibrated contrast, brightness and RGB settings of the monitor do not change between the time of calibration and the loading of the ICC profile.

2 Linux Color Management. Wikipedia, The Free Encyclopedia. Wikimedia Foundation, Inc. 23 Aug. 2010. Web. 22 Aug. 2010. <http://en.wikipedia.org/wiki/Linux_color_management>

LPROF ICC Profiler

LPROF is an ICC profiler with a graphical user interface listed under lprof in the Arch User Repository (AUR).

Note: The following walkthrough is extracted from the ArchWiki article Using LPROF to Profile Monitors.

Monitor Calibration


Adjust the lighting in the room to what you will be using when working. Even if your screen is coated with an anti-reflective coating, you should avoid light falling directly on it. Let your monitor warm up for at least an hour for the image to get stabilized. It is not uncommon for Linux to be kept up 24/7 without shutting down, so you may consider that unless you hate the noise and/or light. That way, monitor will be always on (and your unpaid electric bills will quickly block your doorway),

  1. Set contrast (usually a control with half-black-half-white circle) to maximum. If you find you cannot tolerate the bright highlights, you may lower contrast a little. The higher the better.
  2. Next, display a pure black over entire screen. You can do this by creating a small black PNG image (all pixels have RGB = 0, 0, 0). Open it up in Gwenview (you can install it along with KDE) or any other picture viewer that is capable of displaying an image in full-screen mode without any controls.
  3. Reduce the vertical size of the picture (not the PNG image displayed by a picture viewer but the whole of what's displayed on the screen) to something around 60% or 70% of the full height. What is revealed above and below the picture is called a non-scanned area, and since that are is not receiving any voltage, it is the blackest of black your monitor is capable of displaying.
  4. Locate the brightness control (usually a sun, circle with rays projecting from it's edges) and lower the value until the black image matches the non-scanned area.

Color Temperature

As we said in the introduction, setting color temperature must occur at noon. If you only have fixed factory default color temperature, you don't really need to wait for the sunny day to come. Just set it to 6500K.

Place your monitor so that you can see outside the window and your screen at the same time. For this step, you also need to create a white square image (RGB = 255, 255, 255), roughly 10 by 10 centimeters (4 by 3 inches). Using the same Gwenview technique as with brightness/contrast, display the white square on a pure black background.

  1. First, prepare your eyes by staring at the outside world for a while. Let them adjust to the daylight viewing condition for a few minutes.
  2. Glance at the monitor, and the white square for a few second (it has to be short, because eyes will readjust quickly).
  3. If the square seems yellowish, you need higher color temperature, or if it has a blueish cast, the temperature needs to be lowered.
  4. Keep glancing, looking out the window, and adjusting the white temperature, until the square looks pure white

Take your time with the steps described above. It is essential to get it right.

Monitor Profiling

Start lprof. You will be presented by a fairly large window with multiple tabs on the right.

  1. Click on the Monitor Profiler tab. Then click on the large Enter monitor values >> button.
  2. White point should be set to 6500K (daylight).
  3. Primaries should be set to either SMPTE RP145-1994, or EBU Tech.3213-E or P22, or whatever appropriate values for your monitor. If you come across correct values for your monitor, enter those by selecting User Defined from the drop-down. If in doubt, you may use P22 for all monitors with Trinitron CRTs (in this case, Trinitron is not related to Sony Trinitron mointors and TVs), and SMPTE RP145-1994 for other CRTs.
  4. Click the Set Gamma and Black Point button.
  5. You will now see a full-screen view of two charts with some controls at the bottom.
  6. Uncheck the Link channels check-box and adjust individual Red, Green, and Blue gamma by either moving the slider left or right, or by entering and changing values in the three boxes to the left. The goal is to make the chart on the left (the smaller square one) flat. When you are satisfied with how it looks, check the Link channels check-box and adjust the gamma again.
  7. When you are done, click OK. Click OK again.

When you are finished entering monitor values, you might want to enter some information about the monitor. This is not mandatory, but it is always nice to know what profile is for what.

  1. Click Profile identification button.
  2. Fill in the data.
  3. Click OK to finish.

After you are all done, click on the '...' button next to Output Profile File box. Enter the name of your profile: somemonitor.icc. Click Create Profile button, and you are done.

Additional Resources

Argyll CMS

The Argyll Color Management System is a complete suite of command-line profile creation and loading tools listed under argyllcms in the Arch User Repository (AUR).

Loading ICC Profiles


Xinitrc Example

Load profile Template:Filename in /usr/share/color/icc on display host:0 when X server starts


/usr/bin/xcalib -d :0 /usr/share/color/icc/P221W-sRGB.icc

JWM Template:Filename Example

Load profile Template:Filename in /usr/local/share/color/icc on display host:0 when JWM starts

 Template:Filenamexcalib -d :0 /usr/local/share/color/icc/P221W-sRGB.iccTemplate:Filename


Xinitrc Example

Load profile Template:Filename in /home/arch/.color/icc on display 0 when X server starts


/usr/bin/dispwin -d0 /home/arch/.color/icc/906w-Native.icc

JWM Template:Filename Example

Load Argyll calibration file Template:Filename in /usr/local/share/color/icc on display 1 when JWM starts

 Template:Filenamedispwin -d1 /usr/local/share/color/icc/906w-Native.calTemplate:Filename

Additional Resources