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Lars Tore Gustavsen | 2 Nov 2007 11:16

Re: Color management and GIMP+Gutenprint

I have a printer profile for luster paper. It is a RGB profile. I need
some more time before I have a cmyk profile ready.

http://www.mulebakken.net/div/r2400-luster.zip
The argyll measurements file is also included if someone is interested
in that. The profile is created from 1965 patches.

Ivan Zaera, I am very interested in your tuning parameter. If you have
a chance to post them, it would be very nice.

Lars Tore Gustavsen

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Ivan Zaera Avellon | 2 Nov 2007 11:41
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Re: Color management and GIMP+Gutenprint

Hi Lars:

Sorry, I don't quite understand what you mean by "my tuning parameter". If you 
mean the manual adjustments I referred to in my first mail, forget about 
them :-(. They only worked for two photographs, but when used for a third, 
the colors didn't appear correctly.

I was using: Cyan 90%, Magenta 120%, Yellow 90%. It worked perfect (better 
than Epson/Windows which puts too much red on skins) for "warm" colors (skin, 
wood, etc.) but failed when rendering blues (like, for example, in skies).

If you are referring to the ICC profiles I'm trying to make with a scanner, 
I'm on the way but it will take some time. I have the scanner, I have the 
software (argyllcms) but I need to:

-Get an IT8.7 card from Wolf Faust
-Reinstall my Debian 64bits to use a 32bit version because otherwise the 
scanner doesn't work (I need a proprietary Epson library which is only 
available for 32bit and the source code doesn't compile under 64bits) 
-Learn to use ArgyllCMS (it is documented so it shouldn't be difficult) 
-Do the profiles
-Test them.

I hope to have it in two or three weeks. Anyway, I promise to tell the list 
about it, whether it goes good or bad.

There's another interesting thing that Richard Scobie told me that I was 
suspecting. I have not tried it yet but he did and told me it worked for him. 
The thing is that gutenprint is optimised for sRGB color space. That means 
that, if you are not using color correction, you can only send sRGB data to
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Richard Scobie | 2 Nov 2007 19:46
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Re: Color management and GIMP+Gutenprint


Ivan Zaera Avellon wrote:

> There's another interesting thing that Richard Scobie told me that I was 
> suspecting. I have not tried it yet but he did and told me it worked for him. 
> The thing is that gutenprint is optimised for sRGB color space. That means 
> that, if you are not using color correction, you can only send sRGB data to 
> the printer. if anyone with in-depth knowledge of gutenprint can confirm this 
> it would be good :-).
> 

I did not mean to imply that it was optimised for sRGB.

It's just that in the absence of a fully colour managed workflow, it 
makes sense to standardise on sRGB, as this seems to be the defacto 
space, as it approximates the accurate colour reproduction ability of 
common displays.

If one then takes an image captured in (or converted to sRGB space) and 
prints it in Gutenprint directly  and with the default colour settings 
and correct paper setting, the result should be quite reasonable.

If the image is in a wide space (Adobe 1998, ProRGB etc.), unless a 
printer profile is applied, the result will probably be quite 
unsatisfactory.

Regards,

Richard
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MANCA Giuseppe | 2 Nov 2007 14:28
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getenprint for epsonRX700

hi, whwre i can find this driver?
thanks a lot
Lello

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Barry Loo | 4 Nov 2007 01:00
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Epson R2400

When printing to my Epson R2400, my greyscale prints in Color Model:
Grayscale (CUPS) they come out muddy.  When I print the greyscale
prints in Color Model: RGB the contrast is correct (but of course they
have a color tint to them).  My guess is that in Color Model:
Grayscale only one ink is being used (maybe light black) instead of
using all three shades of grey available (K3 inkset).  When I print
from Windows using the Epson software supplied to the printer,
everything comes out fine.  Am I doing something wrong, or is this an
actual bug?

I'm using Gutenprint v5.1.3 and CUPS v1.2.7

Loo

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Robert Krawitz | 4 Nov 2007 01:31
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Re: getenprint for epsonRX700

   From: MANCA Giuseppe <lello_manca <at> tiscali.it>
   Date: Fri, 2 Nov 2007 14:28:47 +0100

   hi, whwre i can find this driver?
   thanks a lot

This printer is supported in Gutenprint 5.0.1.

--

-- 
Robert Krawitz                                     <rlk <at> alum.mit.edu>

Tall Clubs International  --  http://www.tall.org/ or 1-888-IM-TALL-2
Member of the League for Programming Freedom -- mail lpf <at> uunet.uu.net
Project lead for Gutenprint   --    http://gimp-print.sourceforge.net

"Linux doesn't dictate how I work, I dictate how Linux works."
--Eric Crampton

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Robert Krawitz | 4 Nov 2007 01:32
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Re: Epson R2400

   Date: Sat, 3 Nov 2007 20:00:07 -0400
   From: "Barry Loo" <barry.loo5966 <at> gmail.com>

   When printing to my Epson R2400, my greyscale prints in Color
   Model: Grayscale (CUPS) they come out muddy.  When I print the
   greyscale prints in Color Model: RGB the contrast is correct (but
   of course they have a color tint to them).  My guess is that in
   Color Model: Grayscale only one ink is being used (maybe light
   black) instead of using all three shades of grey available (K3
   inkset).  When I print from Windows using the Epson software
   supplied to the printer, everything comes out fine.  Am I doing
   something wrong, or is this an actual bug?

I'll have to check on this.  It should be using all three inks.

   I'm using Gutenprint v5.1.3 and CUPS v1.2.7

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Robert Krawitz | 4 Nov 2007 02:11
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Re: Epson R2400

   Date: Sat, 3 Nov 2007 20:00:07 -0400
   From: "Barry Loo" <barry.loo5966 <at> gmail.com>

   When printing to my Epson R2400, my greyscale prints in Color
   Model: Grayscale (CUPS) they come out muddy.  When I print the
   greyscale prints in Color Model: RGB the contrast is correct (but
   of course they have a color tint to them).  My guess is that in
   Color Model: Grayscale only one ink is being used (maybe light
   black) instead of using all three shades of grey available (K3
   inkset).  When I print from Windows using the Epson software
   supplied to the printer, everything comes out fine.  Am I doing
   something wrong, or is this an actual bug?

What kind of paper are you using, and what resolution are you printing
at?

At 720 DPI there's some tonal banding when printing grayscale,
probably from the drops not being perfectly calibrated, but at
5760x1440 it looked good.

--

-- 
Robert Krawitz                                     <rlk <at> alum.mit.edu>

Tall Clubs International  --  http://www.tall.org/ or 1-888-IM-TALL-2
Member of the League for Programming Freedom -- mail lpf <at> uunet.uu.net
Project lead for Gutenprint   --    http://gimp-print.sourceforge.net

"Linux doesn't dictate how I work, I dictate how Linux works."
--Eric Crampton
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Bob Snyder | 4 Nov 2007 03:22
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Problem compiling 5.0.1

I didn't see a list for users, not sure if this list is appropriate. If 
not, please steer me in the right direction.

My system is slackware 10.2, 1GB memory.

When I try to build gutenprint-5.0.1 I get this:

 gcc -DHAVE_CONFIG_H -I. -I. -I../.. -I../../include -I../../include 
-Wall -Wcast-align -Wstrict-prototypes -Wmissing-prototypes 
-Wmissing-declarations -Wnested-externs -Wwrite-strings 
-Werror-implicit-function-declaration -Winline -Wformat=2 
-finline-limit=1048576 -I/usr/include/gtk-1.2 -I/usr/include/glib-1.2 
-I/usr/lib/glib/include -I/usr/X11R6/include -Disfinite=finite -O6 -MT 
libgutenprintui_la-panel.lo -MD -MP -MF 
.deps/libgutenprintui_la-panel.Tpo -c panel.c  -fPIC -DPIC -o 
.libs/libgutenprintui_la-panel.o
In file included from /usr/include/gtk-1.2/gtk/gtkarg.h:31,
                 from /usr/include/gtk-1.2/gtk/gtkobject.h:31,
                 from /usr/include/gtk-1.2/gtk/gtkaccelgroup.h:35,
                 from /usr/include/gtk-1.2/gtk/gtk.h:32,
                 from ../../include/gutenprintui/gutenprintui.h:41,
                 from panel.c:36:
/usr/include/gtk-1.2/gtk/gtktypeutils.h:163: warning: function 
declaration isn't a prototype
In file included from /usr/include/gtk-1.2/gtk/gtk.h:80,
                 from ../../include/gutenprintui/gutenprintui.h:41,
                 from panel.c:36:
/usr/include/gtk-1.2/gtk/gtkitemfactory.h:48: warning: function 
declaration isn't a prototype
panel.c: In function `set_entry_value':
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Kai-Uwe Behrmann | 4 Nov 2007 08:49
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Re: Color management and GIMP+Gutenprint

Hello,

pretty all posts about using ICC profiles with Gutenprint come with 
a description about the calibration state. The range of options is 
varying. Doing the calibration by hand can easily become ambigous for 
users.

My suggestion is that Gutenprint explicitely defines a function or 
declare a already available one to create a binary blob or text block 
containing all calibration information.

The Gutenprint documentation should explain, which opposite Gutenprint 
function accepts the same blob for setting the previous calibration state 
in Gutenprint.
After setting the calibration state all affected print options should 
appear fixed in the GUI.

These are be basic requirements to standardize calibration in Gutenprint.
This would be a highly flexible feature and cover not only ICC colour 
management.

To be clear about the term calibration, options like positioning or tray 
selection are not included.
But you can easily support pice wise curve stuff inside the calibration 
blob. 
Having downward compatibility in mind while designing the calibration blob 
data structure would always be welcome. Profiles could this have a long 
live for many needs.

With managing the calibration inside Gutenprint, rather than outside,
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Gmane