[argyllcms] Re: Monitor calibration questions
- From: Michel Joly de Lotbinière <michel@xxxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Wed, 10 Mar 2010 13:36:17 -0500
I've always had better results on my notebook LCD panel with a 1
channel shaper curve matrix profile. No matter what I do
(preconditioning the target patches, increasing the number of
measurement patches, specifying a gamma close to native response,
etc.), I still get faintly warm black values in the grayscale range
RGB(3,3,3) to about RGB(30,30,30), whether the CMM is the Windows one
or LittleCMS. The grayscale is only entirely neutral when the profile
is a single channel matrix/shaper type.
The real, recent surprise for me was upgrading to the most up-to-date
of ArgyllCMS + Florian Hoech's dispcalGUI: I simply set-up dispGUI to
use the high-quality profiling options, D6500, gamma 2.2, the extended
patch set (just 80+ patches, I think), and to produce a 1-channel
shaper/matrix profile unattended, and when I returned from the
supermarket, the result was entirely acceptable, totally easy &
trouble-free in bringing the LCD colors to a known, usable state.
Hats off to Graeme and Florian! The commercial vendors of
user-friendly monitor profiling packages might want to start
worrying...
On Wed, Mar 10, 2010 at 7:17 AM, Roger Breton <graxx@xxxxxxxxxxxx> wrote:
> John,
>
> Have you tried using your Spyder on another monitor, to see whether the
> instrument itself could be introducing a distortion in the measurements? Or
> try with another software?
>
> Roger
>
>>
>> Hi there,
>>
>> I have been trying to calibrate/profile my monitor with argyll. I have a
>> Colorvision Spyder 2 Express. The monitor in question is a laptop screen,
>> specifically it is a "Dell 15.4 WSXGA+ with TrueLife".
>>
>> Basically, my attempts have been pretty unsuccessful. Every calibration I do
>> ends up having lots of magenta, such that blacks and greys on the screen
>> have a distinctive colour cast. I presume this is not correct - it certainly
>> doesn't make photos look very good!
>>
>> I have read about "dynamic contrast" monitors, and apparently they aren't
>> any good for profiling unless you can turn it off. I can't really find any
>> very
>> technical details about the screen, and have no idea whether it has "dynamic
>> contrast" or not. Also, there are no hardware controls for the screen, so I
>> can't really adjust it at all before doing the calibration. Could this be the
>> problem?
>>
>> Alternatively, I know my colorimeter is a pretty cheap model, so perhaps it
>> is
>> just not working very well?
>>
>> Any thoughts would be appreciated.
>>
>> Many thanks,
>> Jon Leighton
>>
>
>
>
>
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