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Re: [Gimp-user] Approach to do cmyk conversion (was: gimp-user-list Digest, Vol 60, Issue 29)

Hello, another suggestion to convert any rgb image to cmyk by open source:
use Krita. Until GIMP is fully capable of doing this, Krita can do right
now: https://krita.org
Anyway, you will encounter color deviations, espacially in the range of blue
and turquise color tones after converting. This is, because rgb and cmyk are
not totally equal - both differ in color tones and color range. I can report
that after conversion from rgb to cmyk, colors, especially blue and reddish
ones, are shiftet in luminosity and look somewhat dull. And bright cobalt
blue tones are shifted towards somewhat turquoise, prussian blue tones.
AFAIK In regular cmyk printing, this is not to be avoided. One reason the
Pantone color tables have been invented for is gaining back those "special"
colors. But this efforts special printing machines, which can print a fifth
or even sixth color.
You may try to correct colors as far as possible after conversion with
Krita, but don´t expect the impossible.
Regards

Klaus Goelker


.

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Gesendet: Sonntag, 25. September 2016 01:14
An: gimp-user-list gnome org
Betreff: gimp-user-list Digest, Vol 60, Issue 29

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Today's Topics:

   1. Re:  Error in opening psd files (Alexandre Prokoudine)
   2. Re:  Color mismatch when an image is printed (Rick Strong)
   3. Re:  Most current version of GIMP (Elle Stone)
   4. Re:  Most current version of GIMP (Joseph A Nagy Jr)
   5. Re:  Color mismatch when an image is printed (James Moe)
   6.  Contrast inadequate with tool descriptions (Judy Wilson)


----------------------------------------------------------------------

Message: 1
Date: Sat, 24 Sep 2016 15:05:00 +0300
From: Alexandre Prokoudine <alexandre prokoudine gmail com>
Cc: gimp-user-list gnome org
Subject: Re: [Gimp-user] Error in opening psd files
Message-ID:
        <CAFjkzc31J9KPdSZMrNvkX1mqLA+twoeQBvKJfz=G=cJC7-WV4w mail gmail com>
Content-Type: text/plain; charset=UTF-8

24 ????. 2016 ?. 0:37 ???????????? "Steve Kinney" ???????:


The GIMP includes a filter that converts the visible image to CMYK
layers, and the result can be exported as a CMYK TIFF file.


Only if one installs a 3rd party plugin called separate+.

Alex


------------------------------

Message: 2
Date: Sat, 24 Sep 2016 13:12:29 -0400
From: "Rick Strong" <rnstrong primus ca>
To: "Pat David" <patdavid gmail com>, "James Moe"
        <jimoe sohnen-moe com>, <gimp-user-list gnome org>
Subject: Re: [Gimp-user] Color mismatch when an image is printed
Message-ID: <345BB4AB15174E6B93916BB3499106F2@RickPC>
Content-Type: text/plain;       charset="utf-8"

I wasn?t meaning a photograph printing store, I was referring to a printing
shop that prints posters, flyers, books, etc. on paper. Like with a printing
press. However, if what the man wants is photo prints printed by someone
else, then yes, sRGB is most likely what he needs to send.

In any and all cases, ask what they want and send them that. After you have
calibrated your monitor, of course.

Rick S.

From: Pat David
Sent: Friday, September 23, 2016 8:37 PM
To: Rick Strong ; James Moe ; gimp-user-list gnome org
Subject: Re: [Gimp-user] Color mismatch when an image is printed

Don't send CMYK to a photo print shop unless they specifically ask for it.
The majority of high end US print shops want sRGB for photo prints (not
books or offset printing - in that case I'd let them do the conversion
unless you know what you're doing).

On Fri, Sep 23, 2016 at 8:35 PM Rick Strong <rnstrong primus ca> wrote:

  I would start by buying a monitor colour calibration device like a SPYDER
  regardless of who is doing the printing, yourself at home or a print shop.
  Google SPYDER. It's simple to use, fast and accurate. There are others.

  If you are sending files out to a print shop send CMYK images in North
  America. The preference in Europe I think is LAB. Check with your printer.
  Try the US Sheetfed/un-coated profile at home or anything that matches
your
  paper and gets you close to your calibrated monitor image.

  Rick S.

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------------------------------

Message: 3
Date: Sat, 24 Sep 2016 16:19:47 -0400
From: Elle Stone <ellestone ninedegreesbelow com>
To: gimp-user-list gnome org
Subject: Re: [Gimp-user] Most current version of GIMP
Message-ID:
        <07a75b3b-e341-7afa-006d-c02b23122a14 ninedegreesbelow com>
Content-Type: text/plain; charset=windows-1252; format=flowed

On 09/24/2016 07:24 AM, Patrick Shanahan wrote:

* FPC Music Ministry <astrydom fpcbentonville org> [09-24-16 05:55]:

In order to ensure I have the latest version of GIMP, should I uninstall

previous versions before downloading and installing the most recent version?


I currently have 2.8.4 on my computers.


Whether you need to uninstall previous versions probably depends on what
operating system you are running. On Linux your package manager takes care
of making sure there are no file clashes between the old and new versions.

On Windows, at least for Partha's builds (http://www.partha.com/, right-hand
column notes - Partha has 2.8.14 available for 64-bit Windows), yes you
should uninstall the old version (the portable version can be run without
interfering with previous installations).

If you have a lot of custom settings in your configuration folder, you might
want to make a backup of the config folder. People running GIMP on Windows
would hopefully have more details.


-----



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returning this to you per your posted instructions although i find it
impossible to completely comply as i do not have possession of many of
the copies.  if this was not your intention, you should post w/o the
*stupid* trailer, or stop using work related product for personal reasons.




Trailers such as the above do seem oddly out of place when posted to an open
mailing list that's duplicated many times over on many servers.

But it's entirely possible that the OP uses GIMP at work and *for* work, so
assumptions to the contrary aren't really warranted.

If someone else already answered the OP's original question, please excuse
my two-cent's worth!

Elle
--
http://ninedegreesbelow.com
Color management and free/libre photography


------------------------------

Message: 4
Date: Sat, 24 Sep 2016 15:53:47 -0500
From: Joseph A Nagy Jr <jnagyjr1978 gmail com>
To: Elle Stone <ellestone ninedegreesbelow com>,
        gimp-user-list gnome org
Subject: Re: [Gimp-user] Most current version of GIMP
Message-ID: <1ad21593-5854-dcba-7213-11e51dc5734a gmail com>
Content-Type: text/plain; charset="windows-1252"

On 09/24/2016 15:19, Elle Stone wrote:

On 09/24/2016 07:24 AM, Patrick Shanahan wrote:

* FPC Music Ministry <astrydom fpcbentonville org> [09-24-16 05:55]:

In order to ensure I have the latest version of GIMP, should I
uninstall previous versions before downloading and installing the
most recent version?

I currently have 2.8.4 on my computers.


Whether you need to uninstall previous versions probably depends on what
operating system you are running. On Linux your package manager takes
care of making sure there are no file clashes between the old and new
versions.

On Windows, at least for Partha's builds (http://www.partha.com/,
right-hand column notes - Partha has 2.8.14 available for 64-bit
Windows), yes you should uninstall the old version (the portable version
can be run without interfering with previous installations).

If you have a lot of custom settings in your configuration folder, you
might want to make a backup of the config folder. People running GIMP on
Windows would hopefully have more details.


I use Gimp for Windows (currently have Gimp installed on Win 8.1 x64 and
Win 10 x64) and just install over older versions. I've never had an
issue with this method (on any version of Windows I've used The GIMP on).


-----



CONFIDENTIAL: The contents of this email, including attachments, is
intended only for the person(s) or entity to which it is addressed
and may contain confidential and/or privileged material.  Any review,
retransmission, dissemination or other use of, or taking of any
action in reliance upon this information by persons or entities other
than the intended recipient is prohibited.  If you received this in
error, please contact the sender and destroy any copies of this
information.




returning this to you per your posted instructions although i find it
impossible to completely comply as i do not have possession of many of
the
copies.  if this was not your intention, you should post w/o the *stupid*
trailer, or stop using work related product for personal reasons.




Trailers such as the above do seem oddly out of place when posted to an
open mailing list that's duplicated many times over on many servers.

But it's entirely possible that the OP uses GIMP at work and *for* work,
so assumptions to the contrary aren't really warranted.

If someone else already answered the OP's original question, please
excuse my two-cent's worth!


Perhaps, but it's still a ridiculous disclaimer, though.



Elle


--
Sincerely,



Joseph A. Nagy, Jr.
Owner
Boo-LaLa(Enterprises) d.b.a. Trinity Electrical & Handyman Services
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Message: 5
Date: Sat, 24 Sep 2016 14:53:31 -0700
From: James Moe <jimoe sohnen-moe com>
To: gimp-user-list gnome org
Subject: Re: [Gimp-user] Color mismatch when an image is printed
Message-ID:
        <sig 1075f7269e 8bbc0929-0788-27e8-82c7-ab236d3a80e4 sohnen-moe com>
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On 09/23/2016 02:28 PM, Pat David wrote:

  I'd search the online manual, except... There is no search function!
Thus rendering the manual somewhat useless for finding specific topics.

http://imgur.com/a/mnhLn


  Ah. Thanks.
  I had started at <http://www.gimp.org>, followed the DOCS link to
<http://www.gimp.org/docs/>, and then to <http://docs.gimp.org/2.8/en/>.
No search function at that destination.
  The image shows the home page of <http://docs.gimp.org/>. And, yay!, a
search option.

--
James Moe
moe dot james at sohnen-moe dot com
520.743.3936
Think.

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Message: 6
Date: Sat, 24 Sep 2016 17:05:49 -0600
From: Judy Wilson <judy corozal com>
To: gimp-user-list gnome org
Subject: [Gimp-user] Contrast inadequate with tool descriptions
Message-ID: <d04dae96-cfee-488e-d3ee-d23a4694b27f corozal com>
Content-Type: text/plain; charset=utf-8; format=flowed

I love this list, have followed it for years, though most is way over my
head, I'm a 73 year old female GIMP lover!

I do a lot of photo editing, and like to change tools rapidly, and want
to learn the keyboard shortcuts. Right now when I mouse over a tool in
the tool box, the pop-up shortcut is white on gray and I can hardly read
it. Is there a way to change this?

Thanks from Judy in Belize!


------------------------------

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