Tags: argyll, bug, dispcalgui, fosdem, Perl, photography, Ubuntu, workaround
The bad news: the default colour calibration wizard on Ubuntu 12.04 has a bug: awful magenta cast on some screens. Fine on others.
The good news: it works flawlessly using the (graphical) alternative below.
As a enthusiastic photographer (see my latest Perl Fosdem pictures) I am very positive about the colour management integration in the latest Ubuntu (12.04). Sure, colour calibration was possible before, but now it’s an integral part of the system and not a simple add-on. Ubuntu++
Once the reviews are in, I will probably buy the ColorHug open source hardware calibration device. In the meantime I borrowed an old Spyder2 (express) from my father-in-law. I do not recommend buying new devices from Colorvision. The company is known to be very antagonistic to free and open source software. But, if you already have the hardware in a drawer it’s better to use it.
Once you plug in the device, the “Calibration” button will activate and the necessary packages will be installed. However, for this HOWTO it’s easier just to install the software (and its dependencies) from a shell window:
$ sudo apt-get install gnome-color-manager
(This install argyll as a dependency that does the real calibration beneath the GUI.)
This step is only applicable if you have a Spyder 2 device. As mentioned above, the company is not FOSS-friendly and doesn’t even provide technical specifications. You will need the firmware of the device from the Windows driver. If you trust me, you can get mine here [MD5: 007ac5705a3a8ed7edf01569700e6ebf]. Put it in the .local/share/color directory in your home directory (create the needed directories if not present). It was extracted from the 2.3.6 Windows driver for the Spider2 Express (the latest at the time of writing). If you want to create the file yourself, see here. In short: you’ll need the driver CD. If you don’t have it or want/need a more up-to-date version, you’ll need to install the driver and feed the generated .dll to spyd2en:
spyd2en -v ./CVSpyder.dll
In the GUI (Dash -> Applications -> Color, or simply type “color” and click the icon), if you select your screen and the “Calibrate…”, the steps offered by the wizard are straight forward. Very easy. While it worked great on the computer of my better half, the generated profile on my own laptop (attached to an external screen) had a terrible magenta cast. Not of the type “your eyes will adapt to it”.
After investigating and looking closely at the profile, it was clear that the profile used a 6500K white balance, instead of the 5000K requested in the wizard (it’s called “Photography and graphics” there). Furthermore, the wizard offered 3 calibrations options: 4, 10 and 20 minutes depending on the desired accuracy. While I chose 4 minutes for testing purposes, the calibration took a long time (an hour or longer). Also, the advanced output in the calibration window (hidden by default) categorised the screen as CRT while it’s a LCD. Because of this, I don’t think the problem is tied to the specific firmware (running the latest available) of the hardware, but rather to gnome-color-manager integration with the device and maybe certain configurations. I don’t have other calibration devices available to test. Bug reported.
dispcalGUI is a OS-agnostic alternative to gnome-color-manager and in fact – just as gnome-color-manager – and GUI on top argyll. Just download the deb (the most recent deb for Ubuntu 11.10 works fine on 12.04). If you double click it, the Ubuntu Software Manager will launch and perform the installation (or just use “dpkg -i” if you are a Debianista at heart).
Now, launch the dispcalGUI application from the Dash or just open a terminal (Ctrl + Alt + t) and type:
Select the Photography profile, your screen (if you have a multi monitor setup) and probe your device (by clicking on the “recycle” arrows) and give your profile a more recognisable name and a location. I use brand_model_calibrationDevice, e.g. Samsung_SyncMaster2443FW_Spyder2Express). Click on Calibrate and Profile and go read a book or take some pictures (it will take a lot longer than 20 minutes, probably an hour). If you wish you can skip the white point and black level, YMMV.
Now go back to the Ubuntu Color Settings as above and add the new created profile by selecting your screen, then click “Add profile”, select other and choose the path you save the monitor profile.
Your monitor is now calibrated!
Perl devroom @FOSDEM2012: photos April 27, 2012Posted by claudio in Uncategorized.
Tags: devroom, fosdem, FOSDEM2012, foss, Free Software, ironman, Perl, photography
1 comment so far
Finally I found the time to “develop” my Perl dev-room @ FOSDEM 2012 pictures (convert from camera RAW files to jpg). It was a very nice event. If you missed the Perl dev-room in the past year, you should really visit us in 2013. Or even better, give a talk.
As the organizer of the Perl dev-room, I had to attend to a few things during the talks. My excuses for not taking pictures of Mark’s and Guillaume’s talk (I was able to attend most of it, though). Sadly, I didn’t had the time to photograph our fabulous Perl stand (although I have some pictures from last year): Wendy, Liz, Eric and all the other volunteers did a great job.
Thank you for a successful Perl FOSDEM presence.
The Program was as follows:
|Welcome to the Perl devroom||Claudio Ramirez||AW1.121||09:00-09:05|
|Moose Primer||Nicholas Perez||AW1.121||09:05-09:25|
|Advanced Moose Techniques||Nicholas Perez||AW1.121||09:35-09:55|
|Perlude: a taste of Haskell in Perl||Marc Chantreux||AW1.121||10:05-10:45|
|The LemonLDAP::NG Project||Clément Oudot||AW1.121||11:55-12:15|
|LedgerSMB: Open source accounting running on Perl||Erik Huelsmann||AW1.121||12:25-12:45|
|Modern PerlCommerce||Stefan Hornburg||AW1.121||13:25-14:05|
|Rapid real-world testing using git-deploy||Ævar Arnfjörð Bjarmason||AW1.121||14:15-14:35|
|The FusionInventory Project||Guillaume Rousse||AW1.121||15:50-16:10|
|Using Moose objects with Memcached||Marius Olsthoorn||AW1.121||16:20-16:40|
Fosdem 2010 Impressions February 19, 2010Posted by claudio in Uncategorized.
Tags: fosdem, Padre, Perl, photography