gimp-print-devel

Re: [Gimp-print-devel] Test print with FUJIFILM ASK-300

[Solomon P. <pi...@sh...>]

On Mon, Jan 21, 2019 at 07:19:40PM -0200, Henrique Santos wrote:
> I did the print tests with the FUJIFILM ASK 300 Printer, but it has
> printing errors. Paper sizes are also inconsistent, with the main sizes
> being 6x4 ", 6x8" and 6x2 ".

What sort of errors?  What do you mean by inconsistent?

> I did the tests with the DNP RX1 Printer and they are practically perfect!
> If the ASK300 will work in a future revision, we will be very happy in

The ASK300 should function perfectly with Gutenprint 5.2.14 or later.

 - Solomon
-- 
Solomon Peachy			       pizza at shaftnet dot org
Coconut Creek, FL                          ^^ (email/xmpp) ^^
Quidquid latine dictum sit, altum videtur.

Re: [Gimp-print-devel] Test print with FUJIFILM ASK-300

[Solomon P. <pi...@sh...>]

On Mon, Jan 21, 2019 at 05:09:15PM -0500, Solomon Peachy wrote:
> The ASK300 should function perfectly with Gutenprint 5.2.14 or later.

I should add that utilizing all features (most notably the full set of 
print sizes) may require the printer firmware to be updated.  You will 
need to contact Fujifilm support in to obtain them though.

 - Solomon
-- 
Solomon Peachy			       pizza at shaftnet dot org
Coconut Creek, FL                          ^^ (email/xmpp) ^^
Quidquid latine dictum sit, altum videtur.

[Gimp-print-devel] Test print with FUJIFILM ASK-300

[Henrique S. <hen...@gm...>]

Hello.
I did the print tests with the FUJIFILM ASK 300 Printer, but it has
printing errors. Paper sizes are also inconsistent, with the main sizes
being 6x4 ", 6x8" and 6x2 ".
I did the tests with the DNP RX1 Printer and they are practically perfect!
If the ASK300 will work in a future revision, we will be very happy in
Brazil.
Regards.
Rick.

[Gimp-print-devel] Canon Pixma MP 470

[Stewart S. <sch...@gm...>]

I’ve tried to use the Gutenprint 5.2.14 driver but it doesn’t seem to work on the above captioned printer. Is there any other download I can try that might get it to work?

[Gimp-print-devel] HP PHOTOSMART C7280

[Anthony <ant...@gm...>]

Good Morning,
   I couldn’t find the driver for my HP PHOTOSMART C7280
My old iMac  version os x el capitan 10.11.6  stopped working correctly with the printer.
so i have been trying to find some driver that will work with that printer,  any ideas?

Anthony

Re: [Gimp-print-devel] c66

[Robert K. <rl...@al...>]

On Wed, 16 Jan 2019 17:06:12 +0100, Martin Gemperle wrote:
> Dear Sir,
>
> I have inherited a Epson C66 new unpacked from a friend.
> Now I am searching for a driver.
> Before a C86 worked well more then a decade!
> I appreciated to work with it.
>
> It seems that for the C66 (earlier) there is no driver for mac.
> I tried on my mini mac, OS 10 9.5,  without result.
> But then by curiosity I connected it to another mac, imac OS 10 6.8 
>
> there it works!
>
> Even shared, I am able to launch prints from my machine. 
>
> On the i mac I read the mention "Gutenprint v5.2.3"
> which directed me to Your site.
> I would be immensely pleased if there is a possibility to make it work on the mini mac. 

Gutenprint 5.2.3 is very old.  You should download Gutenprint 5.2.14
(the current release) from
https://sourceforge.net/projects/gimp-print/files/gutenprint-5.2/5.2.14/

The specific file you want is
https://sourceforge.net/projects/gimp-print/files/gutenprint-5.2/5.2.14/gutenprint-5.2.14.dmg/download

Please be sure to read the instructions.  Gutenprint isn't an app that
you run per se; it's printer drivers that you can use with your printer.
-- 
Robert Krawitz                                     <rl...@al...>

***  MIT Engineers   A Proud Tradition   http://mitathletics.com  ***
Member of the League for Programming Freedom  --  http://ProgFree.org
Project lead for Gutenprint   --    http://gimp-print.sourceforge.net

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

[Gimp-print-devel] c66

[Martin G. <ma...@ge...>]

Dear Sir,

I have inherited a Epson C66 new unpacked from a friend.
Now I am searching for a driver.
Before a C86 worked well more then a decade!
I appreciated to work with it.

It seems that for the C66 (earlier) there is no driver for mac.
I tried on my mini mac, OS 10 9.5,  without result.
But then by curiosity I connected it to another mac, imac OS 10 6.8 

>> there it works!

Even shared, I am able to launch prints from my machine. 

On the i mac I read the mention "Gutenprint v5.2.3"
which directed me to Your site.
I would be immensely pleased if there is a possibility to make it work on the mini mac. 

Thanking You for Your kind answer,
faithfully Yours

Martin T
Paris 

[Gimp-print-devel] Test

[Robert K. <rl...@al...>]

I'm not sure I'm receiving email to gimp-print-devel having to do with
an email address change.  So, testing it.

-- 
Robert Krawitz                                     <rl...@al...>

***  MIT Engineers   A Proud Tradition   http://mitathletics.com  ***
Member of the League for Programming Freedom  --  http://ProgFree.org
Project lead for Gutenprint   --    http://gimp-print.sourceforge.net

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

Re: [Gimp-print-devel] HP Deskjet 940c

[Gernot H. <aik...@gm...>]

On Sat, Jan 12, 2019 at 11:52 PM new user via Gimp-print-devel
<gim...@li...> wrote:
> Hello I am trying to download a Guten Print Driver For My HP Desk Jet 940c But No Success, and How do you use Guten Print, if you could help I would Really appreci
> ate it.

Hello Anths,
Thanks for trying to use this software, we hope it will be useful for
you. The gutenprint software supplies a set of drivers, it does not
set up your printer for you, for that you need to access the drivers
via your normal printer configuration software. The steps are as
below, but your system may be different, so this is only a guide based
on the very limited information in your request email.

First, you need to download the package. Presumably your OS does not
provide a package, so I assume you are using MacOSX?
If so, you should download the 5.2.14 package from the MacOSX page here:
http://gimp-print.sourceforge.net/MacOSX.php
( else the generic download page is here:
http://gimp-print.sourceforge.net/p_Download.php )

The DMG file should install on your OS just fine, as I understand it
works from 10.6.8 up until the latest version. If you need an earlier
version, see the above page and read "Project Notes" further down the
page, as well as the notes below each DMG file. For example 5.2.10
works from 10.5 up, 5.2.11 (and later) from 10.6 up.

After you have installed the DMG file (any trouble you might have
installing the DMG file, please ask again here), you should go to your
printer administration software (e.g., CUPS web interface at
http://localhost:631, or whatever printer add/remove/setup software
you use), and add a new printer. Then look for your printer in the
list of available drivers.
For CUPS, the name of printer shows as follows:
HP DeskJet 940C

Once you add it (and thus create a printer queue) you can set defaults
with CUPS or whatever printer configuration program you use, and
select this printer for printing from applications.

Hope that helps.
Gernot Hassenpflug

> Thanks Anths

Re: [Gimp-print-devel] Pixma Pro 9000ii

[Gernot H. <aik...@gm...>]

On Sat, Jan 12, 2019 at 6:15 AM Ellen and Bob Hesse via
Gimp-print-devel <gim...@li...> wrote:
>
> Hello,
> After installing Mojave on my Mac Mini late 2014 my printer no longer worked and Canon no longer supports it. I downloaded Gutenprint 5.2.14. This was simple and quick. I added the printer and the driver showed up immediately. Test print worked great.
> Thanks!!!

Hello Ellen/Bob,
Glad this project could be of help with your Pro9000 Mk2, although you
will likely find some issues with colour printing of photos, since we
do not provide any calibration. Very happy that it works for you
though, and the you can make use of gutenprint under MacOSX.
Best regards,
Gernot Hassenpflug

Re: [Gimp-print-devel] Gutenprint with Xerox Phaser 6200 DP

[Gernot H. <aik...@gm...>]

On Sat, Jan 12, 2019 at 6:15 AM Don Babcock <dba...@za...> wrote:
>
> I have the referenced printer and I have just upgraded to a new iMac running Mojave. I ran the installer and added a the printer, but, while the file appears to process and send, it never prints. I added Ghostscript after the fact, but that hasn’t helped.

Hi Don,
As far as I am aware, no new drivers for Phasers have been created.

> Can you give me some direction?

What was the version of gutenprint you were using before? And are you
sure the printer was using the gutenrprint driver?
As far as I can tell from our website, the supported products are:

Xerox Phaser 6200B: xerox-phaser_6200b
Xerox Phaser 6200DP: xerox-phaser_6200dp
Xerox Phaser 6200DX: xerox-phaser_6200dx
Xerox Phaser 6200N: xerox-phaser_6200n

So which of these drivers, or which other, were/are you using?

Best regards,
Gernot Hassenpflug
> Don Babcock
>
>
> _______________________________________________
> Gimp-print-devel mailing list
> Gim...@li...
> https://lists.sourceforge.net/lists/listinfo/gimp-print-devel

[Gimp-print-devel] HP Deskjet 940c

[new u. <ant...@ao...>]

Hello I am trying to download a Guten Print Driver For My HP Desk Jet 940c But No Success, and How do you use Guten Print, if you could help I would Really appreci
ate it.

Thanks Anths 

[Gimp-print-devel] Pixma Pro 9000ii

[Ellen a. B. H. <ean...@ic...>]

Hello,
After installing Mojave on my Mac Mini late 2014 my printer no longer worked and Canon no longer supports it. I downloaded Gutenprint 5.2.14. This was simple and quick. I added the printer and the driver showed up immediately. Test print worked great.
Thanks!!!

Re: [Gimp-print-devel] How to use ICC profile with gutenprint/cups/ghostscript ?

[Toerless E. <tte...@cs...>]

Thanks, Walker, inline

On Wed, Jan 09, 2019 at 09:55:41PM -0500, fo...@wa... wrote:
> You can print with a profile to Gutenprint while using Lightroom or Photoshop on MacOS just like any other printer driver. Print the target, build the profile, place it in >Library>ColorSync>Profiles and select it when printing from Photoshop or Lightroom or any other ICC compatible software.

Thanks, my mentioning about MacOS might have been confusing: I just used
it for experimentation. The printer is meant to run from a linux
(server) computer, and most of the photos to print would also just
be printed simply from lpr on linux, so i can not rely on the ICC
management in MacOS or any application itself like gimp (on linux),
but i really want to make sure that the ICC profile gets applied at
gutenprint/cups/ghostscript level.

> It is possible to apply it automatically by listing it in the PPD so ColorSync knows to use it when you select a specific media type, but this is not a feature built out yet in Gutenprint so you would have to manually type this into the PPD.

Seems as if gutenprint on my linux system has the ppd here:
/etc/cups/ppd/l1800.ppd

I just have no idea where or how i would add an ICC profile here. 
Something like cupsICCProfile ?
Documented in
https://opensource.apple.com/source/cups/cups-136/cups/doc/help/spec-ppd.html

Googling for that first finds threads discussing how its ignored by cups ;-))

*sigh*

> I suggest just manually selecting the ICC. If you are interested in the specs though check out the CUPS ppd apis specific to apple and you will see this documentation.

"specific to apple" is i guess something that would only make
sense when running on MacOS. Really wondering if this stuff all
does not work on linux or other non-macos versions of cups.

Cheers
    Toerless

> Best regards,
> Walker
> 
> 
> 
> > On Jan 9, 2019, at 3:05 PM, Toerless Eckert <tte...@cs...> wrote:
> > 
> > [resending.. sent yesterday but email is not showing up in archive,
> > so it must have been lost/blocked somewhere].
> > 
> > Using Epson L1800 with latest gutenprint/cups/ghostscript on linux.
> > 
> > Would like to use an ICC profile to make color output more accurate
> > (create with ArgyllCMS and i1pro, which works great creating and using
> > ICC profiles to use with printing on MacOS).
> > 
> > Alas, i can not figure out how to stuff the ICC profile into the
> > gutenprint/cups/ghostscript chain and neither can i find documentation
> > explaining how to.
> > 
> > The gutenprint 5.2 user manual only has a note on page 28 that makes
> > me think that ICC profiles are clearly supported/possible, but no
> > explanation on how to include them.
> > 
> > Ghostscript does have parameters to supply icc profile to it, e.g.:
> > "-sOutputICCProfile", but there is no way to configure the parameter
> > via CUPS (or at least i have not found a way to do it via the normal
> > CUPS weeb interface or anything else documented). And of course, i do
> > not know if simply configuring that parameter with an RGB ICC profile
> > would work (confused about where i would need RGB vs. device space
> > profiles).
> > 
> > Last year i asked on the cups mailing list how to configure such a
> > parameter, but i received no response.
> > 
> > I tried a bit to figure out how ghostscript is even called from
> > the environment of cups and gutenprint, but gave up on the undocumented
> > complexity of the chain of programs seemingly calling each other.
> > 
> > So, hereby asking on gutenprint mailing list.
> > 
> > Thank you very much!
> > 
> > 
> > _______________________________________________
> > Gimp-print-devel mailing list
> > Gim...@li...
> > https://lists.sourceforge.net/lists/listinfo/gimp-print-devel

Re: [Gimp-print-devel] How to use ICC profile with gutenprint/cups/ghostscript ?

[<fo...@wa...>]

You can print with a profile to Gutenprint while using Lightroom or Photoshop on MacOS just like any other printer driver. Print the target, build the profile, place it in >Library>ColorSync>Profiles and select it when printing from Photoshop or Lightroom or any other ICC compatible software.

It is possible to apply it automatically by listing it in the PPD so ColorSync knows to use it when you select a specific media type, but this is not a feature built out yet in Gutenprint so you would have to manually type this into the PPD. I suggest just manually selecting the ICC. If you are interested in the specs though check out the CUPS ppd apis specific to apple and you will see this documentation.


Best regards,
Walker



> On Jan 9, 2019, at 3:05 PM, Toerless Eckert <tte...@cs...> wrote:
> 
> [resending.. sent yesterday but email is not showing up in archive,
> so it must have been lost/blocked somewhere].
> 
> Using Epson L1800 with latest gutenprint/cups/ghostscript on linux.
> 
> Would like to use an ICC profile to make color output more accurate
> (create with ArgyllCMS and i1pro, which works great creating and using
> ICC profiles to use with printing on MacOS).
> 
> Alas, i can not figure out how to stuff the ICC profile into the
> gutenprint/cups/ghostscript chain and neither can i find documentation
> explaining how to.
> 
> The gutenprint 5.2 user manual only has a note on page 28 that makes
> me think that ICC profiles are clearly supported/possible, but no
> explanation on how to include them.
> 
> Ghostscript does have parameters to supply icc profile to it, e.g.:
> "-sOutputICCProfile", but there is no way to configure the parameter
> via CUPS (or at least i have not found a way to do it via the normal
> CUPS weeb interface or anything else documented). And of course, i do
> not know if simply configuring that parameter with an RGB ICC profile
> would work (confused about where i would need RGB vs. device space
> profiles).
> 
> Last year i asked on the cups mailing list how to configure such a
> parameter, but i received no response.
> 
> I tried a bit to figure out how ghostscript is even called from
> the environment of cups and gutenprint, but gave up on the undocumented
> complexity of the chain of programs seemingly calling each other.
> 
> So, hereby asking on gutenprint mailing list.
> 
> Thank you very much!
> 
> 
> _______________________________________________
> Gimp-print-devel mailing list
> Gim...@li...
> https://lists.sourceforge.net/lists/listinfo/gimp-print-devel

[Gimp-print-devel] Please ignore

[Toerless E. <toe...@gm...>]

Sorry for posting just a test email to the list, but i tried to
subscribe from another email address and even though it seems that i
can send emails to the list (there are copies sent back to me), they
do not show up on the archive of the mailing list
(https://sourceforge.net/p/gimp-print/mailman/gimp-print-devel), so i
am trying to troubleshoot what is going on.

[Gimp-print-devel] How to use ICC profile with gutenprint/cups/ghostscript ?

[Toerless E. <tte...@cs...>]

[resending.. sent yesterday but email is not showing up in archive,
 so it must have been lost/blocked somewhere].

Using Epson L1800 with latest gutenprint/cups/ghostscript on linux.

Would like to use an ICC profile to make color output more accurate
(create with ArgyllCMS and i1pro, which works great creating and using
 ICC profiles to use with printing on MacOS).

Alas, i can not figure out how to stuff the ICC profile into the
gutenprint/cups/ghostscript chain and neither can i find documentation
explaining how to.

The gutenprint 5.2 user manual only has a note on page 28 that makes
me think that ICC profiles are clearly supported/possible, but no
explanation on how to include them.

Ghostscript does have parameters to supply icc profile to it, e.g.:
"-sOutputICCProfile", but there is no way to configure the parameter 
via CUPS (or at least i have not found a way to do it via the normal
CUPS weeb interface or anything else documented). And of course, i do
not know if simply configuring that parameter with an RGB ICC profile
would work (confused about where i would need RGB vs. device space
profiles).

Last year i asked on the cups mailing list how to configure such a
parameter, but i received no response.

I tried a bit to figure out how ghostscript is even called from
the environment of cups and gutenprint, but gave up on the undocumented
complexity of the chain of programs seemingly calling each other.

So, hereby asking on gutenprint mailing list.

Thank you very much!

[Gimp-print-devel] How to use ICC profile with gutenprint/cups/ghostscript ?

[Toerless E. <tte...@cs...>]

Using Epson L1800 with latest gutenprint/cups/ghostscript on linux.

Would like to use an ICC profile to make color output more accurate
(create with ArgyllCMS and i1pro, which works great creating and using
 ICC profiles to use with printing on MacOS).

Alas, i can not figure out how to stuff the ICC profile into the
gutenprint/cups/ghostscript chain and neither can i find documentation
explaining how to.

The gutenprint 5.2 user manual only has a note on page 28 that makes
me think that ICC profiles are clearly supported/possible, but no
explanation on how to include them.

Ghostscript does have parameters to supply icc profile to it, e.g.:
"-sOutputICCProfile", but there is no way to configure the parameter 
via CUPS (or at least i have not found a way to do it via the normal
CUPS weeb interface or anything else documented). And of course, i do
not know if simply configuring that parameter with an RGB ICC profile
would work (confused about where i would need RGB vs. device space
profiles).

Last year i asked on the cups mailing list how to configure such a
parameter, but i received no response.

I tried a bit to figure out how ghostscript is even called from
the environment of cups and gutenprint, but gave up on the undocumented
complexity of the chain of programs seemingly calling each other.

So, hereby asking on gutenprint mailing list.

Thank you very much!

[Gimp-print-devel] Gutenprint with Xerox Phaser 6200 DP

[Don B. <dba...@za...>]

I have the referenced printer and I have just upgraded to a new iMac running Mojave. I ran the installer and added a the printer, but, while the file appears to process and send, it never prints. I added Ghostscript after the fact, but that hasn’t helped.

Can you give me some direction?

Don Babcock

Re: [Gimp-print-devel] Synology Diskstation question in regards of Gutenprint Solution

[Robert K. <rl...@al...>]

On Sun, 6 Jan 2019 10:24:40 +0000, =?iso-8859-1?Q?Marc_Kn=F6dler?= wrote:
> Dear all,
>
> thank you for offering inside Synology your printer drivers.

We don't offer anything inside Synology; that would presumably be
Synology that does so.  Does whoever distributes the "Gutenprint
Solution" provide the source code for what they distribute (as they're
required to do), so you can look at what version of Gutenprint it
includes?  If it's not provided, you have a right under the GPL to
request it.

Gutenprint needs to be at 5.2.14 to support color printing to laser
printers.

> I am running an HP ColorLaserJet 2840 via Synology Diskstation DS231+. It is properly operating but printing only in black and white mode.
>
> How can I change it to operate in color mode?
>
> In this forum (unfortunately only in German) it is stated that on a Synology Diskstation the Gutenprint Solution can print in color mode - https://www.synology-forum.de/showthread.html?57789-=DCber-AirPrint-druckt-Drucker-nicht-farbig!/page3
>
> [cid:image003.png@01D4A5B2.699E22C0]
>
> But I do not know in which files this 2 lines
>
>             ColorModel RGB/Color rgb chunky 0
>             ColorModel CMYK cmyk chunky
>
> In Gutenprint Solution have been entered.
>
> Currently my printer qis setup as follows:

-- 
Robert Krawitz                                     <rl...@al...>

***  MIT Engineers   A Proud Tradition   http://mitathletics.com  ***
Member of the League for Programming Freedom  --  http://ProgFree.org
Project lead for Gutenprint   --    http://gimp-print.sourceforge.net

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

[Gimp-print-devel] Gratitude

[JS <js...@fa...>]

Hi,

I just wanted to say a big thanks for maintaining this project. Such a commendable effort in making sure that there are open source drivers for the otherwise closed source print industry model.

Cheers.

- JS

Re: [Gimp-print-devel] Driver support for HP Officejet Pro 7720 under Mac OS Snow Leopard 10.6.8?

[Gernot H. <aik...@gm...>]

On Sat, Jan 5, 2019 at 2:17 AM Schmitt, Clemens
<cle...@ch...> wrote:
>
> Hi,
>
> Do you have a solution for this one, too? Or is there any alternative driver you would suggest to use?

Hello Clemens,
I see the printer has the following language support:
HP PCL3 GUI
While there is no developer for PCL at the moment, you could try some
of the generic PCL drivers included in gutenprint.
Regards,
Gernot Hassenpflug

[Gimp-print-devel] Synology Diskstation question in regards of Gutenprint Solution

[Marc K. <mar...@we...>]

Dear all,

thank you for offering inside Synology your printer drivers.

I am running an HP ColorLaserJet 2840 via Synology Diskstation DS231+. It is properly operating but printing only in black and white mode.

How can I change it to operate in color mode?

In this forum (unfortunately only in German) it is stated that on a Synology Diskstation the Gutenprint Solution can print in color mode - https://www.synology-forum.de/showthread.html?57789-Über-AirPrint-druckt-Drucker-nicht-farbig!/page3

[cid:image003.png@01D4A5B2.699E22C0]

But I do not know in which files this 2 lines

            ColorModel RGB/Color rgb chunky 0
            ColorModel CMYK cmyk chunky

In Gutenprint Solution have been entered.

Currently my printer qis setup as follows:

[cid:image001.png@01D4A5B1.0A0E97F0]

[cid:image002.png@01D4A5B1.0A0E97F0]

Your help / support is very much appreciated. Thank you.

With best regards,

Marc Knoedler from Germany near Stuttgart
Mobile: +49 151 46455663
mar...@we...<mailto:mar...@we...>

Re: [Gimp-print-devel] Determining Ink transition values for a custom inkset

[Robert K. <rl...@al...>]

On Fri, 4 Jan 2019 08:48:24 -0800, Eric Domazlicky wrote:
> I've been experimenting with using Gutenprint to print B&W images using an
> Epson 1430 loaded with six custom-mixed shades of grey inks. I've managed
> to get passable results by changing the <shade> values of the "MIS Hextone"
> inkset definition in the claria.xml to what I estimate the relative
> densities of my mixed inks to be. However, when I print a 21 step gray
> tablet I get strange artifacts in some parts of the tablet and areas of
> non-linearity.
>
> I did some testing with "unprint" and was able to replicate my results by
> having the <shade> value different from the "unprint" density values. So
> I'm fairly sure my issue is the <shade> values aren't correct. My question
> is, is there any tool within Gutenprint that would allow me to determine
> relative ink densities? I've looked at "testpattern" but it doesn't seem to
> allow me to print a pattern for each ink channel separately unless I'm
> missing something.

testpattern is indeed the way to do it.

The way I usually do this is to print a series of pairwise narrow
bands, using the darker ink at a fixed lower density (maybe 25%) and
sweeping the lighter ink from zero to, 100% (you don't want to
saturate the paper).  Do it at the highest resolution offered by the
printer so that drop sizes are as small as possible, and use Ordered
dither with only the smallest drop size.

The output will look something like this:

|           |           |           |           |
|     |     |     |     |     |     |     |     |
-------------------------------------------------
                ----------------=================
-------------------------------------------------
                ----------------=================
-------------------------------------------------
                ----------------=================
-------------------------------------------------
                ----------------=================
-------------------------------------------------
                ----------------=================
-------------------------------------------------
|     |     |     |     |     |     |     |     |
|           |           |           |           |

The pattern file looks something like this:

#================
printer escp2-artisan1430;
mode extended 6 16;
parameter Resolution 2880x720sw;
parameter "DitherAlgorithm" "Ordered";
parameter "ColorCorrection" "Raw";
hsize 1.0;
# Use 1/10 of the vertical paper size to get narrow bands
vsize 0.1;
# Print multiple patterns on one page by incrementing this by 0.1 each time
top 0.0;

# This forces use of only the smallest drop size.
parameter_float "DropSize1" 1.0;
parameter_float "DropSize2" 1.0;
parameter_float "DropSize3" 1.0;

grid 100;
grid 100;
grid 20;
grid 20;
grid 10;
grid 10;
xpattern 0.0 0.0 1.0  0.25 0.25 1.0   0.0 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0;
xpattern 0.0 1.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0;
xpattern 0.0 0.0 1.0  0.25 0.25 1.0   0.0 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0;
xpattern 0.0 1.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0;
xpattern 0.0 0.0 1.0  0.25 0.25 1.0   0.0 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0;
xpattern 0.0 1.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0;
xpattern 0.0 0.0 1.0  0.25 0.25 1.0   0.0 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0;
xpattern 0.0 1.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0;
xpattern 0.0 0.0 1.0  0.25 0.25 1.0   0.0 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0;
xpattern 0.0 1.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0;
xpattern 0.0 0.0 1.0  0.25 0.25 1.0   0.0 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0;
grid 10;
grid 10;
grid 20;
grid 20;
grid 100;
grid 100;
#================

The goal of this is to find the horizontal point at which vertically
the pattern looks smooth.  Let's say that's around 0.4, from left to
right.  At that point, you're using 40% light ink, which is matching
up with the (constant) 25% darker ink, so the ratio between the two
inks is 40:25 or 8:5 -- you need 8 parts light ink to match 5 parts
dark ink.  Remember that the third number in each group (1.0) is the
gamma -- you always want this set to 1.0 to get linear behavior.

It's worth checking that by printing the same pattern, but with a much
narrower range of light ink.  So rather than sweeping from 0-1.0,
sweep .35-.45, like this:

xpattern 0.0 0.0 1.0  0.25 0.25 1.0  0.0 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0;
xpattern 0.35 0.45 1.0  0.0 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0;

and expect to find the best match somewhere around 0.5 in this case.

If you want to confirm your fine tuning at this point, you could try
printing sweeps in both directions that should have identical
darkness, and seeing that what you get is uniform:

xpattern 0.0 0.4 1.0  0.25 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0;
xpattern 0.4 0.0 1.0  0.0 0.25 1.0  0.0 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0;

You need to repeat the process with all of the adjacent pairs of inks;
for the next ink you would do

xpattern 0.0 0.0 1.0  0.0 0.0 1.0  0.25 0.25 1.0  0.0 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0;
xpattern 0.0 0.0 1.0  0.0 1.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0  0.0 0.0 1.0;

and so forth.

Hope this helps; please feel free to ask when you have further questions.
-- 
Robert Krawitz                                     <rl...@al...>

***  MIT Engineers   A Proud Tradition   http://mitathletics.com  ***
Member of the League for Programming Freedom  --  http://ProgFree.org
Project lead for Gutenprint   --    http://gimp-print.sourceforge.net

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

[Gimp-print-devel] Determining Ink transition values for a custom inkset

[Eric D. <edo...@gm...>]

Hello,

I've been experimenting with using Gutenprint to print B&W images using an
Epson 1430 loaded with six custom-mixed shades of grey inks. I've managed
to get passable results by changing the <shade> values of the "MIS Hextone"
inkset definition in the claria.xml to what I estimate the relative
densities of my mixed inks to be. However, when I print a 21 step gray
tablet I get strange artifacts in some parts of the tablet and areas of
non-linearity.

I did some testing with "unprint" and was able to replicate my results by
having the <shade> value different from the "unprint" density values. So
I'm fairly sure my issue is the <shade> values aren't correct. My question
is, is there any tool within Gutenprint that would allow me to determine
relative ink densities? I've looked at "testpattern" but it doesn't seem to
allow me to print a pattern for each ink channel separately unless I'm
missing something.