[OT] Monitor Calibration with whacky White Point
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[OT] Monitor Calibration with whacky White Point
 
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Hi all, I'm trying to get the monitor on my laptop (Dell Precision M6300) calibrated. I am following the instructions at Norman Koren's page (http://www.normankoren.com/makingfineprints1A.html), using his gamma charts to tweak gamma on the laptop. I'm running Ubuntu Intrepid and using the nVidia X Server Settings tool to try to calibrate the LCD. The problem is that it has a horrible color cast, making the Monitor Test Pattern (http://www.normankoren.com/makingfineprints1A.html#Monitor_test_pattern) non-neutral. The underlying cause is that this laptop has no way of adjusting the color temperature. It is probably around 9300K, and there is no way to get it to 6500K. I was hoping that someone out there has had and resolved this problem. Any help would be greatly appreciated! Paul _______________________________________________ Digikam-users mailing list [hidden email] https://mail.kde.org/mailman/listinfo/digikam-users |
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Paul Waldo ha scritto:
> Hi all, > > I'm trying to get the monitor on my laptop (Dell Precision M6300) calibrated. I am following the instructions at Norman Koren's page (http://www.normankoren.com/makingfineprints1A.html), using his gamma charts to tweak gamma on the laptop. > > I'm running Ubuntu Intrepid and using the nVidia X Server Settings tool to try to calibrate the LCD. The problem is that it has a horrible color cast, making the Monitor Test Pattern (http://www.normankoren.com/makingfineprints1A.html#Monitor_test_pattern) non-neutral. > Try using some tool like monica http://www.pcbypaul.com/software/monica.html Or the gamma page in kcontrol to get a neutral tone. You should unlink the 3 color channels and set them indipendently. Maybe also the "build a coarse profile" function in the monitor tab in LProf could be useful. Note that a yellowish color cast is normal on a well calibrated monitor... but it will seem yellowish only at the beginnig! Your eyes will adapt. good luck gerlos _______________________________________________ Digikam-users mailing list [hidden email] https://mail.kde.org/mailman/listinfo/digikam-users |
Re: [OT] Monitor Calibration with whacky White Point
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2008/11/13 gerlos <[hidden email]>:
> Paul Waldo ha scritto: >> Hi all, >> >> I'm trying to get the monitor on my laptop (Dell Precision M6300) calibrated. I am following the instructions at Norman Koren's page (http://www.normankoren.com/makingfineprints1A.html), using his gamma charts to tweak gamma on the laptop. >> >> I'm running Ubuntu Intrepid and using the nVidia X Server Settings tool to try to calibrate the LCD. The problem is that it has a horrible color cast, making the Monitor Test Pattern (http://www.normankoren.com/makingfineprints1A.html#Monitor_test_pattern) non-neutral. >> > > Try using some tool like monica > http://www.pcbypaul.com/software/monica.html > > Or the gamma page in kcontrol to get a neutral tone. You should unlink > the 3 color channels and set them indipendently. > Where is the Gamma page in kcontrol? I cannot find it, even with search. > Maybe also the "build a coarse profile" function in the monitor tab in > LProf could be useful. > LProf? What is that? -- Dotan Cohen http://what-is-what.com http://gibberish.co.il א-ב-ג-ד-ה-ו-ז-ח-ט-י-ך-כ-ל-ם-מ-ן-נ-ס-ע-ף-פ-ץ-צ-ק-ר-ש-ת ä-ö-ü-ß-Ä-Ö-Ü _______________________________________________ Digikam-users mailing list [hidden email] https://mail.kde.org/mailman/listinfo/digikam-users |
Re: UNS: Re: [OT] Monitor Calibration with whacky White Point
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On Thursday 13 November 2008 13.07:35, Dotan Cohen wrote:
> > Where is the Gamma page in kcontrol? I cannot find it, even with search. peripherals -> display -> Monitor Gamma regards Daniel -- Daniel Bauer photographer Basel Barcelona professional photography: http://www.daniel-bauer.com erotic art photos: http://www.bauer-nudes.com Madagascar special: http://www.fotograf-basel.ch/madagascar/ _______________________________________________ Digikam-users mailing list [hidden email] https://mail.kde.org/mailman/listinfo/digikam-users |
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In reply to this post by Paul Waldo
Paul Waldo ha scritto:
> Hi gerlos, > > I tried using the new and improved version of Monica, GAMMApage. It is in > essence an Adobe Gamma tool, with 3 colored blocks and a gamma gradient. I > had unlinked the three sliders and made the squares as they should be. The > problem is that the gamma gradient still had a brown color cast; it should > have been all gray. > A somehow yellowish cast is typical of a calibrated screen, if it's not too much it should be OK and a sign that you did the right thing. It may take ten minutes before you adapt your eyes to it. If it's too much...maybe something went wrong! But maybe it's better to wait for some guru to answer to answer, I'm not sure what to do in such extreme cases! good luck gerlos _______________________________________________ Digikam-users mailing list [hidden email] https://mail.kde.org/mailman/listinfo/digikam-users |
Re: [OT] Monitor Calibration with whacky White Point
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On Thu, Nov 13, 2008 at 2:18 PM, gerlos <[hidden email]> wrote:
Paul Waldo ha scritto: Maybe its OK, then. I'll compare with my calibrated stationary monitor and see how it looks. Thanks! Paul _______________________________________________ Digikam-users mailing list [hidden email] https://mail.kde.org/mailman/listinfo/digikam-users |
Re: [OT] Monitor Calibration with whacky White Point
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In reply to this post by Paul Waldo
----- "gerlos" <[hidden email]> wrote:
> Paul Waldo ha scritto: > > Hi gerlos, > > > > I tried using the new and improved version of Monica, GAMMApage. It is in > > essence an Adobe Gamma tool, with 3 colored blocks and a gamma gradient. I > > had unlinked the three sliders and made the squares as they should be. The > > problem is that the gamma gradient still had a brown color cast; it should > > have been all gray. > > > > A somehow yellowish cast is typical of a calibrated screen, if it's not > too much it should be OK and a sign that you did the right thing. It may > take ten minutes before you adapt your eyes to it. > > If it's too much...maybe something went wrong! But maybe it's better to > wait for some guru to answer to answer, I'm not sure what to do in such > extreme cases! > > > good luck > gerlos It is incredibly hard trying to get a screen at the wrong temperature calibrated! So, I spent about an hour tweaking the gamma, brightness and contrast for R, G and B channels. Its not the best job in the world, but Norman Koren's Gamma Chart looks pretty good and his Black Level Chart shows I have removed the bad color cast I had before. While these results would appear promising, I'm not sure I believe that the changes have done much for me. Now anything that is supposed to be white on screen has a definite blue color cast that won't go away no matter how long I stare at the monitor. Does anyone have any sage advice, or suggestions for a forum better suited to these issues? Thanks in advance! Paul _______________________________________________ Digikam-users mailing list [hidden email] https://mail.kde.org/mailman/listinfo/digikam-users |
Re: [OT] Monitor Calibration with whacky White Point
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Op Monday 17 November 2008, schreef Paul Waldo:
> While these results would appear promising, I'm not sure I believe that the > changes have done much for me. Now anything that is supposed to be white on > screen has a definite blue color cast that won't go away no matter how long > I stare at the monitor. No sage advice, but a blue color cast on a properly calibrated monitor could suggest your ambient lighting is much too warm. This would prevent full adjustment to the monitor's color temp. Maybe you could look into that. _______________________________________________ Digikam-users mailing list [hidden email] https://mail.kde.org/mailman/listinfo/digikam-users |
Re: UNS: Re: [OT] Monitor Calibration with whacky White Point
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On Monday 17 November 2008 18.35:31, Dennis Meulensteen wrote:
> Op Monday 17 November 2008, schreef Paul Waldo: > > While these results would appear promising, I'm not sure I believe that > > the changes have done much for me. Now anything that is supposed to be > > white on screen has a definite blue color cast that won't go away no > > matter how long I stare at the monitor. > > No sage advice, but a blue color cast on a properly calibrated monitor > could suggest your ambient lighting is much too warm. This would prevent > full adjustment to the monitor's color temp. Maybe you could look into > that. Hello, (Monitor) calibration is - as you now experienced - a very, very complicated and tricky thing... To make it short: I would first put the monitor on a "usual" gamma setting (like 1.2) in kcontrol, put on the surrounding light in your office "as usual" and then adjust the monitor itself (hardware sliders...) so that you can distinguish the darkest black from the second darkest and the brightest white from the second brightest. Then (still on the hardware) switch around the different color modes that the monitor offers (like "warm", "cold", whatever it has...) until you find what you think looks like gray. Finally I'd take some photos, some b/w's, some color ones that you have in a paper version you like and in a quality scan (or digital image) and adjust the contrast/brightness sliders on the monitor until it somehow fits. I think you cannot really do much more... If you want to have a "really" calibrated monitor first have a look at your bank account... then buy a monitor that you can calibrate - think about some 2 or 3 thousand Euros - if you find a cheap one. Also buy a calibraton tool (densitometer), that is something looking like a mouse that will mesure the light emission from your monitor and tell you in which direction you have to apply changes. Then you need a hood on the monitor that eliminates lieght from the top and the sides. You'd also better have a standardized light in the room where your monitor is (no more looking out of the window in the sun, sorry). Finally you shoud also buy a printer you can calibrate, but then it's getting really tricky and you should first book a course in color management... If you have that much money, I'd suggest, you send a part of it to me, save the rest and just be happy with the simple, but not perfect solution I mentioned first. Conclusion: don't think too much about calibration unless you really have to deliver color-proof work all the time. regards Daniel -- Daniel Bauer photographer Basel Barcelona professional photography: http://www.daniel-bauer.com erotic art photos: http://www.bauer-nudes.com Madagascar special: http://www.fotograf-basel.ch/madagascar/ _______________________________________________ Digikam-users mailing list [hidden email] https://mail.kde.org/mailman/listinfo/digikam-users |
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