[argyllcms] Re: Awful result with Argyll 1.3.5 + dispcalGUI 0.8 + i1Display Pro & Dell U2711 :-(((
- From: "Philip Reed" <philipreed@xxxxxxxxxxxxx>
- To: <argyllcms@xxxxxxxxxxxxx>
- Date: Fri, 13 Jan 2012 14:32:29 -0500
I'm not surprised that Argyll and i1Profiler report different white points
despite the same input parameters. It's anyones guess what is going on
"under the hood" of i1Profiler. But that's a question for programers as I'm
no expert. I agree that the measurement should not be software dependent,
but certainly see how it can be.
The white patch changing over time speaks to a different issue. Electronic
or system "drift" is a very real phenomena. Particularly with CRT displays,
but LCDs are also very prone to this especially if they use flourescent
lamps. Output and color temperature will increase as they warm up. Voltage
fluctuations will also have a noticable effect. I never calibrate my
display until it's been on for about an hour. Even after that it will drift
a bit in either direction. The change in white point is very visually
noticeable. A one hour difference is not a short amount of time, especially
if the device has just been turned on.
A shift in temperature of even a few degrees can also have a profound effect
on a colorimeter or spectrometer. That's why I pre-warm the instrument and
use drift compensation. It makes the process much longer, but I get very
consistent results.
Regards - Phil
-----Original Message-----
From: argyllcms-bounce@xxxxxxxxxxxxx [mailto:argyllcms-bounce@xxxxxxxxxxxxx]
On Behalf Of Paolo Avezzano
Sent: Friday, January 13, 2012 8:14 AM
To: argyllcms@xxxxxxxxxxxxx
Cc: argyllcms@xxxxxxxxxxxxx
Subject: [argyllcms] Re: Awful result with Argyll 1.3.5 + dispcalGUI 0.8 +
i1Display Pro & Dell U2711 :-(((
Before trying one more time to find the """perfect""" way to profile my
display, just a quick note.
Both dispcalGUI and i1Profiler let the user adjust RGB controls in order to
get good white point and the right brightness level for the calibration
process.
Well, they're actually -very- different. Set the controls for D65 under
i1Profile and, with the very same settings, dispcalGUI will report
completely different white point/level.
These measures should not be software dependent: the same white patch can't
be so different when measured with a short distance of time (display on for
more than an hour), can it?
Regards,
Paolo Avezzano
Il giorno 13/gen/2012, alle ore 09:24, "Fabrizio Giudici"
<Fabrizio.Giudici@xxxxxxxxxxxx> ha scritto:
> On Fri, 13 Jan 2012 08:47:41 +0100, Paolo Avezzano
<info@xxxxxxxxxxxxxxxxx> wrote:
>
>> Phil,
>> Your brightness is way too much for me. I edit my photos in a dim
environment as well, but I need to lower the brightness up to 80-85cd to
avoid eye strain and to get predictable results with my prints.
>>
>> How did you chose the black point other than native? I mostly print on
Ilford GFS and boy, what a good D-max! Black is really black :)
>> Did you calculate that based on target contrast?
>
> I know that 6500K is pretty much a standard practice. Have a look here:
>
> http://www.boscarol.com/blog/?p=8014
>
>
> --
> Fabrizio Giudici - Java Architect, Project Manager
> Tidalwave s.a.s. - "We make Java work. Everywhere."
> fabrizio.giudici@xxxxxxxxxxxx
> http://tidalwave.it - http://fabriziogiudici.it
>
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