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Today's Topics:
1. Re: Colorsync-users Digest, Vol 6, Issue 209 (edmund ronald)
2. Re: Colorsync-users Digest, Vol 6, Issue 209 (Robert Krawitz)
3. Calibration purple hue problem (Roberto Lotti)
4. Re: Calibration purple hue problem (Cdtobie)
----------------------------------------------------------------------
Message: 1
Date: Sat, 5 Sep 2009 21:43:57 +0200
From: edmund ronald <email@hidden>
Subject: Re: Colorsync-users Digest, Vol 6, Issue 209
To: Robert Krawitz <email@hidden>
Cc: email@hidden, email@hidden
Message-ID:
<email@hidden>
Content-Type: text/plain; charset=ISO-8859-1
Maybe you could detail how one can put the 9600 printer
Gutenprint/Cups in non-corrected mode and adjust the densities, and
where the settings get saved, then someone with color competence (me?)
can establish ink limits, we can all make some profiles, and then I
can freeze a version of the driver that can be distributed as a
solution to all concerned?
The Epson 2100/2200 which has the same ink set also doesn't work with
Snow Leopard and this is a *very* popular printer, so there are
presumably thousands if not tens of thousands of very angry people now
waiting for a solution which we could easily give them.
I know that free software is about giving people freedom; it helps to
show them that freedom is actually useful.
Edmund
On Thu, Sep 3, 2009 at 2:36 AM, Robert Krawitz<email@hidden>
wrote:
Date: Wed, 2 Sep 2009 07:38:59 +0200
From: edmund ronald <email@hidden>
I am working on a solution that should make use of Gutenprint with
the 9600/7600 much easier.
For now, I am sure that Robert could be persuaded to help set up
better ink curves for Gutenprint on the 9600 - maybe by running
some measurements on the old Epson driver and matching ink
densities?
There are some other bugs in Gutenprint, it appears, on the 9600,
and if the existing printers still have a couple of years of life
in them it might be worth doing some work on this as the 9800
drivers are descended from the 9600 drivers.
I have a 9600 too, so this concerns me directly :)
I don't have access to any of these printers, so I'm not able to tune
them. If someone else wants to, go right ahead.
The most likely problem is that the density is too low. This will
result in blacks being too light.
--
Robert Krawitz <email@hidden>
Tall Clubs International -- http://www.tall.org/ or 1-888-IM-TALL-2
Member of the League for Programming Freedom -- mail email@hidden
Project lead for Gutenprint -- http://gimp-print.sourceforge.net
"Linux doesn't dictate how I work, I dictate how Linux works."
--Eric Crampton
------------------------------
Message: 2
Date: Sat, 5 Sep 2009 20:42:37 -0400
From: Robert Krawitz <email@hidden>
Subject: Re: Colorsync-users Digest, Vol 6, Issue 209
To: edmund ronald <email@hidden>
Cc: email@hidden, email@hidden
Message-ID:
<email@hidden>
Date: Sat, 5 Sep 2009 21:43:57 +0200
From: edmund ronald <email@hidden>
Maybe you could detail how one can put the 9600 printer
Gutenprint/Cups in non-corrected mode and adjust the densities, and
where the settings get saved, then someone with color competence
(me?) can establish ink limits, we can all make some profiles, and
then I can freeze a version of the driver that can be distributed
as a solution to all concerned?
Everything is stored in the PPD files in the *Default... lines. The
*StpDefault... lines specify the Gutenprint defaults, to enable tools
to reset the PPD files to all of their original settings.
The settings you need to adjust are:
* Color Correction, in Output Control Common, should be set to
Uncorrected (Edmund, we may want to discuss this, but I think that
for general purposes this should be best).
* The Density control adjusts the overall (master) density. This
value is relative to the pre-set density values. Density Fine
Adjustment allows a more precise adjustment in units of 0.005.
* The Cyan Density, Magenta Density, Yellow Density, and Black Density
values adjust the density of the respective ink relative to the
master density control. There are similar fine adjustment values
for these, too.
I generally suggest not setting the per-channel density controls to
anything greater than 1; increase the master density instead. At
low resolutions, though, you may need to increase the per-channel
density values.
--
Robert Krawitz <email@hidden>
Tall Clubs International -- http://www.tall.org/ or 1-888-IM-TALL-2
Member of the League for Programming Freedom -- mail email@hidden
Project lead for Gutenprint -- http://gimp-print.sourceforge.net
"Linux doesn't dictate how I work, I dictate how Linux works."
--Eric Crampton
------------------------------
Message: 3
Date: Sun, 6 Sep 2009 19:52:46 +0200
From: Roberto Lotti <email@hidden>
Subject: Calibration purple hue problem
To: email@hidden
Message-ID:
<email@hidden>
Content-Type: text/plain; charset=ISO-8859-1
Hi everyone,
I have a MacBookPro (late 2008) and have troubles calibrating it
with an i1
Display 2. After calibrating/profiling I get a serious purple shift
on blue
colors using color managed software like Photoshop, LR ...
I've tried different kind of calibration settings and the iMatch and
basiccolor Display software and always end up with the same
problem: when I
switch the profiles in ColorSync and have e.g. Photoshop open and an
image
with lots of blue, the blue changes regarding the profile as long
as I
don't click on the image or PS, than it suddenly changes into purple.
The last profile created (some minutes ago, with BasiCColor display
4) has
these settings:
- native white point
- tone curve L (not gamma 1.8 or 2.2)
- max luminance (160 cd/m2)
- max contrast
I used these preset settings to quickly check if I encountered the
same
problems of iMatch. I doubt that going to select more specific
settings can
improve.
I've searched the internet and found people with the same problem,
but no
answers.
Maybe somone can send me his profile (hardware calibrated) which
doesn't
give this blue/purple shift to see if it's working on mine.
Or I can send my calibrated profile (which gives me the purple
shift) to
check if it happens on other MBPs too.
I would really appreciate if someone could help.
Thanks a lot,
Roberto
------------------------------
Message: 4
Date: Sun, 6 Sep 2009 14:31:34 -0400
From: Cdtobie <email@hidden>
Subject: Re: Calibration purple hue problem
To: Roberto Lotti <email@hidden>
Cc: "email@hidden"
<email@hidden>
Message-ID: <email@hidden>
Content-Type: text/plain; charset=us-ascii; format=flowed; delsp=yes
A fix for this issue has been developed for the Spyder3 product line.
I am not aware of any fixes for other products; but it's worth asking.
C. D. Tobie
Global Product Technology Mngr.
Digital Imaging & Home Theater
Datacolor.com
email@hidden
On Sep 6, 2009, at 1:52 PM, Roberto Lotti <email@hidden>
wrote:
Hi everyone,
I have a MacBookPro (late 2008) and have troubles calibrating it
with an i1
Display 2. After calibrating/profiling I get a serious purple shift
on blue
colors using color managed software like Photoshop, LR ...
I've tried different kind of calibration settings and the iMatch and
basiccolor Display software and always end up with the same
problem: when I
switch the profiles in ColorSync and have e.g. Photoshop open and an
image
with lots of blue, the blue changes regarding the profile as long
as I
don't click on the image or PS, than it suddenly changes into purple.
The last profile created (some minutes ago, with BasiCColor display
4) has
these settings:
- native white point
- tone curve L (not gamma 1.8 or 2.2)
- max luminance (160 cd/m2)
- max contrast
I used these preset settings to quickly check if I encountered the
same
problems of iMatch. I doubt that going to select more specific
settings can
improve.
I've searched the internet and found people with the same problem,
but no
answers.
Maybe somone can send me his profile (hardware calibrated) which
doesn't
give this blue/purple shift to see if it's working on mine.
Or I can send my calibrated profile (which gives me the purple
shift) to
check if it happens on other MBPs too.
I would really appreciate if someone could help.
Thanks a lot,
Roberto
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