Re: [Gimp-developer] Haze on GIMP 2.4 image - Should this be a bug report?

2008-01-06 Thread Hal V. Engel
On Sunday 06 January 2008 11:52:49 Mark Lowry wrote:
> The reason I asked is that my goal when
> post-processing is to end up with a print that looks
> like my screen.  

This is one goal that users should be able to achieve.  But I would take it 
even farther by saying I want what is on my screen to match what I saw when I 
snapped the shutter (before I start changing the image in an editor).  And 
for that to also match what comes out of my printer.

> When I print from Windows Picture & 
> Fax Viewer, it looks like what I see on the screen.  

You were lucky since this usually does not happen for most users.

> I 
> assumed that printing from GIMP would give you a print
> that looked like the image that is open in GIMP, but I
> guess that's just silly.  Who would want that?

Most everyone wants this.   The real question/issue is what is the 
proper/reliable way to achieve this.  If you do not have your color 
management properly setup for your whole imaging workflow you will have 
difficulties getting this kind of result.GIMP now has some color 
management awareness and can, if properly setup, color manage images on the 
computer display.  This also means that if it is not properly setup that you 
could end up with very strange results as you found out.  As far as I know 
GIMP is still missing the functionality to directly support a color managed 
printing work flow.  But at least on Linux and some other platforms this can 
be handled using other tools such as PhotoPrint.

Setting up proper color management is not a trivial task and it also requires 
some specialized hardware and software.  Not too long ago this hardware and 
software was considered to be very specialized and was also expensive.  In 
the last few years the cost of the hardware has declined significantly and 
there are two cross platform open source software solutions (IE. the software 
can be free).  Most users can now afford to create custom profiles for at 
least their input (camera, scanner..) and display devices.  Many printer and 
paper vendors offer free printer/paper specific profiles for Windows and OS/X 
users that approach the quality of custom printer profiles.  Now days it is 
possible to get everything you need to do proper color management on a 
Windows or OS/X system for under $100 (a color meter and a profiling target 
such as an IT8.7 target) assuming you can get good printer profiles from 
either your printer or paper vendor.  Just two years ago this would have cost 
at least $350 perhaps more and it was difficult to get free printer/paper 
specific profiles.  For Linux users and Windows and OS/X users who can't get 
free printer profiles it is possible to get custom printer profiles from 
vendors that do this sort of thing for as little as $25.  I expect that over 
time we will see farther reductions in these costs but this is clearly to the 
point where almost anyone can afford to do this the correct way.  Most of the 
existing barriers to users doing this are in the areas of awareness and 
education.

Hal

>
> . Mark
>
> --- Sven Neumann <[EMAIL PROTECTED]> wrote:
> > > 2.  If Try to use... is left checked, and printing
> >
> > is
> >
> > > done through GIMP, should I expect the printed
> >
> > result
> >
> > > to be different from the version printed through
> > > Windows Picture and Fax Viewer?
> >
> > What does the monitor profile have to do with
> > printing? Nothing.
> >
> >
> > Sven
>
>  
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Re: [Gimp-developer] Haze on GIMP 2.4 image - Should this be a bug report?

2008-01-06 Thread Sven Neumann
Hi,

On Sun, 2008-01-06 at 15:15 +, Michael Grosberg wrote:

> GIMP aims to be a respectable high-end graphic editor and as such should
> support color management by default. The problem you encountered is the same
> problem many first-time users of Photoshop encounter. Actually, Photoshop
> users sometime have it much worse: some report the entire image to be yellow
> or pink, due to some color management issue or another.

We have had the same reports from Windows users of GIMP 2.4. Some
monitors (or graphics cards?) seem to come with Windows software that
installs a system-wide monitor profile. This can't possibly work as a
monitor needs to be individually calibrated. And some of these monitor
profiles even seem to be so bad that they cause terrible color casts.


Sven


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Re: [Gimp-developer] Haze on GIMP 2.4 image - Should this be a bug report?

2008-01-06 Thread Michael Grosberg
Mark Lowry  yahoo.com> writes:

> Two questions:
> 
> 1.  Shouldn't Try to use be unchecked by default
> at installation?  This would prevent some confusion,
> at least it would have for me.

GIMP aims to be a respectable high-end graphic editor and as such should
support color management by default. The problem you encountered is the same
problem many first-time users of Photoshop encounter. Actually, Photoshop
users sometime have it much worse: some report the entire image to be yellow
or pink, due to some color management issue or another.

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Re: [Gimp-developer] Haze on GIMP 2.4 image - Should this be a bug report?

2008-01-06 Thread Robert Krawitz
   Date: Sun, 6 Jan 2008 11:52:49 -0800 (PST)
   From: Mark Lowry <[EMAIL PROTECTED]>

   The reason I asked is that my goal when post-processing is to end
   up with a print that looks like my screen.  When I print from
   Windows Picture & Fax Viewer, it looks like what I see on the
   screen.  I assumed that printing from GIMP would give you a print
   that looked like the image that is open in GIMP, but I guess that's
   just silly.  Who would want that?

It's not silly, but the monitor profile doesn't have anything to do
with printing.  The monitor profile is just the profile for the
monitor; it affects how the image is displayed.

As for whether you'll get exactly the same output if you print through
GIMP vs. if you print through the viewer, that depends upon exactly
what GIMP (and the print plugin you're using -- if you're using
Windows, I suspect you're using the GIMP 2.4 print plugin, not the
Gutenprint plugin with which I'm familiar) does in the way of color
management on printing, and exactly what the viewer does.  I'm not
familiar with Windows printing, so I don't know exactly where color
management happens in the printing chain.  But that's independent of
what either GIMP or the viewer does with the *monitor* profile.

   --- Sven Neumann <[EMAIL PROTECTED]> wrote:
   > 
   > > 2.  If Try to use... is left checked, and printing is
   > > done through GIMP, should I expect the printed result
   > > to be different from the version printed through
   > > Windows Picture and Fax Viewer?
   > 
   > What does the monitor profile have to do with printing? Nothing.

-- 
Robert Krawitz <[EMAIL PROTECTED]>

Tall Clubs International  --  http://www.tall.org/ or 1-888-IM-TALL-2
Member of the League for Programming Freedom -- mail [EMAIL PROTECTED]
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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Re: [Gimp-developer] Haze on GIMP 2.4 image - Should this be a bug report?

2008-01-06 Thread Mark Lowry
The reason I asked is that my goal when
post-processing is to end up with a print that looks
like my screen.  When I print from Windows Picture &
Fax Viewer, it looks like what I see on the screen.  I
assumed that printing from GIMP would give you a print
that looked like the image that is open in GIMP, but I
guess that's just silly.  Who would want that?

. Mark

--- Sven Neumann <[EMAIL PROTECTED]> wrote:
> 
> > 2.  If Try to use... is left checked, and printing
> is
> > done through GIMP, should I expect the printed
> result
> > to be different from the version printed through
> > Windows Picture and Fax Viewer?
> 
> What does the monitor profile have to do with
> printing? Nothing.
> 
> 
> Sven
> 
> 
> 



  

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Re: [Gimp-developer] Haze on GIMP 2.4 image - Should this be a bug report?

2008-01-06 Thread Sven Neumann
Hi,

On Sun, 2008-01-06 at 05:39 -0800, Mark Lowry wrote:

> 1.  Shouldn't Try to use be unchecked by default
> at installation?  This would prevent some confusion,
> at least it would have for me.

It is off by default since version 2.4.2. Too many Windows users seem to
have installed monitor profiles without knowing about it. A monitor
profile is only useful if it is indeed created for the particular
monitor and viewing conditions.

> 2.  If Try to use... is left checked, and printing is
> done through GIMP, should I expect the printed result
> to be different from the version printed through
> Windows Picture and Fax Viewer?

What does the monitor profile have to do with printing? Nothing.


Sven


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Re: [Gimp-developer] Haze on GIMP 2.4 image - Should this be a bug report?

2008-01-06 Thread Mark Lowry
> Mark Lowry skrev:
> > Attached is a link to a screen capture showing the
> > same image opened in Windows Picture and Fax
> viewer
> > and in GIMP 2.4.  As you can see, the GIMP version
> (no
> > editing performed) has a haze compared to the WP&F
> > viewer version.
> > 
> >
>
http://vabirdy.tripod.com/images/puppypics/gimp_jpeg_haze.jpg
> > 
> > This is very annoying, but I'm not sure which
> viewer
> > is at fault.  Should I submit a bug report for
> this?
> > 
> > Thanks . Mark
> > 
> 
> Hello
> 
> This is probably a color management issue. I don't
> think the image
> viewer in Windows is color managed, so if you also
> disable display color
> management in GIMP (File -> Preferences -> Color
> Management -> set
> Monitor Profile to None and uncheck Try to use the
> system monitor
> profile), does this still happen?
> 
> Martin
> 
> 

My monitor profile was already set to None, but
unchecking Try to use the system monitor profile does
make the issue go away.

Two questions:

1.  Shouldn't Try to use be unchecked by default
at installation?  This would prevent some confusion,
at least it would have for me.

2.  If Try to use... is left checked, and printing is
done through GIMP, should I expect the printed result
to be different from the version printed through
Windows Picture and Fax Viewer?

Also, at some point I've turned off the option to
automatically receive post to this board via e-mail,
but I can't find a link to get back to my profile to
change it.  Can someone direct me to the correct place
to change this setting, please?

Thanks . Mark


  

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Re: [Gimp-developer] Haze on GIMP 2.4 image - Should this be a bug report?

2008-01-05 Thread Martin Nordholts
Mark Lowry skrev:
> Attached is a link to a screen capture showing the
> same image opened in Windows Picture and Fax viewer
> and in GIMP 2.4.  As you can see, the GIMP version (no
> editing performed) has a haze compared to the WP&F
> viewer version.
> 
> http://vabirdy.tripod.com/images/puppypics/gimp_jpeg_haze.jpg
> 
> This is very annoying, but I'm not sure which viewer
> is at fault.  Should I submit a bug report for this?
> 
> Thanks . Mark
> 

Hello

This is probably a color management issue. I don't think the image
viewer in Windows is color managed, so if you also disable display color
management in GIMP (File -> Preferences -> Color Management -> set
Monitor Profile to None and uncheck Try to use the system monitor
profile), does this still happen?

Martin

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[Gimp-developer] Haze on GIMP 2.4 image - Should this be a bug report?

2008-01-05 Thread Mark Lowry
Attached is a link to a screen capture showing the
same image opened in Windows Picture and Fax viewer
and in GIMP 2.4.  As you can see, the GIMP version (no
editing performed) has a haze compared to the WP&F
viewer version.

http://vabirdy.tripod.com/images/puppypics/gimp_jpeg_haze.jpg

This is very annoying, but I'm not sure which viewer
is at fault.  Should I submit a bug report for this?

Thanks . Mark



  

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