Monitor Calibration

[Gerhardus]

Today I got my new huey from newegg.
I am a photographer and use a spyder coupled with ps elements in windows. I decided to try out ubuntu with the hopes of being able to make a complete conversion. In order to do this I need to be able to calibrate and profile my monitor. Now I got lprof and got nowhere on a bullet train when trying to use it with my spyder. So I decided to try argyll though I've heard that it's more complicated, I need my monitor profiled. After hunting and fighting and trying for several days I realized that getting a spyder1 to work with it would be more difficult that just upgrading. In my research I found that colorvision is particularly hostile towards open source. I decided to go with a huey, because of the price and the fact that it's said to be supported. In lprof I haven't been able to figure out in the slightest how to get the huey to work. Searching on line, I've found no helpful tutorials or blogs that explain how to use them just a few saying that it is supposed to work and a couple saying that it does. I'm not opposed to using argyll, but I've heard about lprof working with colorimeters and since it's available in the repositories and it's graphical, I would much prefer figuring it out there. Nothing against using command lines but it'll be a lot easier to convince other photogs to convert if I can show them something they can do as well. If anybody has any idea please let me know

[kayosiii]

from what I can gather from wikipedia http://en.wikipedia.org/wiki/Linux_color_management the version of lprof that supports hardware calibration is not yet released... that information could easily be out of date. I would march on over to lprof website and offer to help test for them.

[rockin_goliath]

http://linux.softpedia.com/get/Utili...age-4628.shtml

GAMMApage is great. I do a little photography myself, and also just like having the colors on my monitor look even and nice. You don't have to install anything, it's just a little script file that you click on, and any changes you make are reversible. Try it out!

[glantucan]

Hi folks,

GAMMApage, Monica, Kgamma, just correct the luminance curve of your graphics-card/monitor to make it as linear as possible. They DON'T produce any monitor profile, which is a must for good printing.

For that you would use lprof or Argyll. For now I'm testing lprof, but the important thing, if you don't want to invest time in tests, is that you can use a profile created on windows. See http://ubuntuforums.org/showpost.php...11&postcount=5

I do photography under linux (see my site down there) and I managed a satisfying workflow. 1) create a monitor profile (under winXP, but some hardware is also supported by Linux, AFAIK). 2) load it with xcalib (I have a script which I run if needed so I can check that the data is indeed loaded; there is a command to remove any LUT information, check xcalib --help). 3) load the same profile in your application, (gimp 2.4rc should work, I use cinepaint); chose your editing profile (sRGB or AdobeRGB). You have a working color managed display.

To load the profile when you log in you can add:

xcalib <profile(with complete path)>

to ~/.xinitrc

I'm having my own problems getting all this to work, but the experts say it is all possible (I guess I made so many changes in my configuration that I messed all up) so I keep trying.

For good step by step tutorials go to http://jcornuz.wordpress.com/

For a very good (and easy to understand) technical explanation about what color management is all about go to http://regex.info/blog/photo-tech/color-spaces-page0/

EDIT:
Putting xcalib call in ~/.xinitrc does not work if you use automatic graphical session start.
As said here https://wiki.ubuntu.com/CustomXSession it should work crating ~/.xsession as a symbolic link to ~/.xinitrc:

ln -s ~/.xinitrc ~/.xsession

I tried and didn't work either, my profile is not loaded on session start.

SOLUTION:
Create a script named xCALIB.sh (or other name you like) with the following contents:

#!/bin/bash
killall gnome-screensaver
xcalib /media/datos/__MisDocs/settings/PROFILES/LiteOnAdobeGamma_sinFlexo080704.icc
gnome-screensaver

and add it to your start applications. In gnome, go to system/preferences/sessions and click Add in the Start programs tab. Add the script click OK, close and you are done.

NOTE:
Gnome-screensaver is killed before and restarted when the profile is loaded to workaround a bug of gnome-screensaver, which causes the loaded profile to unload.
It seems that if you call xcalib before gnome-screensaver daemon is started this is solved.
I read somewhere this was fixed for the last versions of gnome-screensaver, but it doesn't hurt much to be cautious.

Hope this help
Cheers

[glantucan]

Hi again

I've been trying to create as a first step a rough monitor profile with lprof using my eyes as measurements devices (eyes are not good ones, I know)
Just to clarify, I open lprof, get to the monitor tab, press enter monitor values choose D65 white point, leave default option for monitor primaries and press the set gamma and black point button. Follow the on-screen instructions, and accept the changes. Finally I save it. If I use the profile checker in lprof I get these values:

Profile: rgb built-in - (lcms internal)

lcms RGB virtual profile



White point near  D65 (daylight)

Media white (XYZ): 95.02, 100.00, 108.84
Primaries: R:0.64, 0.33  G:0.3, 0.6  B:0.15, 0.06
Estimated gamma: R:2.31, G:2.33  B:2.31

The problem is that when I try to load it with xcalib from the command line nothing happens.

I can load windows generated profiles with xcalib with no problem.

I even tried to create a really messed up profile using really high gamma value for the reds. Still no change when I try to load it with xcalib.

Any ideas?

Thanks

[glantucan]

I found someone who ran into the same problem:

Lprof and xcalib didn’t work for me. Either Lprof didn’t write a profile that xcalib understood, or xcalib wasn’t able to properly communicate to the video card. I suspect the later, as on xcalibs site it is noted that xcalib has trouble setting a couple variables on older ATI cards.

http://linuxtidbits.wordpress.com/20...e-the-display/

I have a nvidia Geforce 8600 GTS, though

No solution yet