Re: [Gimp-user] color proofing / printing -- profiles not applied when printing? gutenprint plugin

[ugajin talktalk net]

I find Gimp printer dialogues confused even for the Epson driver, which 
is simpler than Gutenprint, at least it is for my printer which is not a 3880.
It is sometimes difficult to find how to switch between ColorMatching systems.
Look for  the "ColorMatching" control to select correct colour management system. 
On OSX this would be ColorSync and Epson Color Controls and/or Vendor is inactive.
If that doesn't fix it, you could try the Epson driver and repeat, and/or try
posting to https://lists.sourceforge.net/lists/listinfo/gimp-print-devel

 
- A


-----Original Message-----
From: Gary Aitken <gimp dreamchaser org>
To: ugajin talktalk net; gimp-user-list gnome org
Sent: Fri, 31 Jan 2014 20:11
Subject: Re: [Gimp-user] color proofing / printing -- profiles not applied when printing? gutenprint plugin


On 01/31/14 05:05, ugajin talktalk net wrote:

> You cannot actively colour manage a workflow unless you have colour calibrated 
your monitor.

I understand that, and have that on my list of things to get done.

> Also, you do not say if you are printing to Epson Premium Glossy Photo Paper, 
nor do you say
> what profile/media settings you have selected in the printer driver.

Epson premium glossy paper user, selected in the driver

> The default RGB space has to be something if colour management is active.

true, but not necessarily used.

> However, it is unlikely yourdigital photographs will use this colour space.

As far as my own images go, I'm starting from raw, so the color space is
whatever I export with the image from ufraw.

> ProPhoto RGB, is a wide colour gamut, developed by Kodak.
> It much wider than sRGB and is also sometimes called ROMM RGB.

Didn't realize at first that ROMM RGB was another name for ProPhoto;
found that subsequently, thanks.

What I don't understand is this:
I have physical prints from cone color on Epson premium glossy photo paper,
printed with conecolor k3 inks which were designed specifically to be a 
very close match for epson ultrachrome k3 inks.
Regardless of what the image looks like on screen,
if I import the image and keep its embedded profile,
then print it using the appropriate profile for the printer + paper + ink,
I should get an image that closely matches the professionally supplied
one.
I'm not; it's got too much yellow in the skin tones.

In the gutenprint print dialog, under the "Output" tab, by default it has
the following settings:
  Color Correction:  Default
  Image Type:        Mixed Text and Graphics
I set Image Type to "Photograph", but left Color Correction alone.

If I set Color Correction to "High Accuracy" I see no difference.

Gary

> -----Original Message-----
> From: Gary Aitken <gimp dreamchaser org>
> To: gimp-user-list gnome org <gimp-user-list gnome org>
> Sent: Thu, 30 Jan 2014 21:22
> Subject: [Gimp-user] color proofing / printing -- profiles not applied when 
printing? gutenprint plugin
> Hi all,
>
> I recently installed an epson 3880 and am trying to get decent color out of 
it.
> I'm relatively new at this and may have more than one thing wrong.
> At the moment I am using the outback photo printer evaluation image as a test,
> since it has rather large color bars and swatches to compare:
>   http://outbackprint.outbackphoto.com/printinginsights/pi049/essay.html
>
> I have my Color Management preferences set as follows:
>   Mode of operation:          Color managed display
>   RGB Profile:                sRGB IEC61966-2.1
>   CMYK profile:               None
>   Monitor profile:            NEW MultiSync LCD 1970NX
>   Display rendering intent:   Perceptual
>   Print simulation profile:   Epson Stylus Pro 3880_3890 PremiumGlossyPhotoPaper
>   Softproof rendering intent: Perceptual
>                               Mark out of gamut colors
>   File Open behaviour:        Ask what to do
>
> The test image has an embedded profile, "ProPhoto RGB", which I chose to keep
> when I loaded it in.  It shows under "Image"/"Image Properties"/"Color 
Profile"
> as "ProPhoto RGB   Reference Output Medium Metric(ROMM).  I don't know what
> the "Reference Output Medium Metric" means...
>
> With color management disabled in the display filters dialog
>   ("View"/"Display Filters"/"Color Display Filters")
> the image on-screen appears darker and less saturated, with reds too orange
> and blues too violet.
>
> With color management enabled the image looks bright and highly saturated,
> although the saturated green-yellow and green patches become difficult to 
> distinguish.  I suspect that is an out-of-gamut situation, but not sure.
> The photographic images in the test image become much brighter and
> saturated.
>
> If I also enable "Color Proof", things get muted a bit, particularly in the
> test patches, although changes in the actual photographic images on-screen
> are much more subtle.
>
> Questions related to viewing on the display:
> Assuming the incoming image is "correct" with its attached color profile:
>
> 1. Checking only "Color Management"
>      Is this "the best / most accurate we can do on this display"?
> 2. Checking only "Color Proof"
>      What does this represent?  Is it a rendering of the image mapped to
>      RGB and then color-corrected for the printer, and therefore incorrect?
>      Is any display color-correction included in this?
> 3. Checking both "Color Management" and "Color Proof"
>      Is this the proper way to preview an image for printing?
> 4. This dialog is labelled "Display Filters".  I am assuming that means
>    items selected here *only* affect how the display appears, and has 
>    nothing to do with printing.  Correct?
>
> The images being printed appear similar to what I see on the screen with
> "Color Management" unchecked, and "Color Proof" unchecked:
>   When printed, the most saturated reds appear dull and orangeish
>   The image has three saturated greens, clearly distinguished in unmanaged
>   mode on-screen, but with two of them difficult to distinguish in managed 
>   mode on-screen.  The prints have the clearly distinguishable green
>   pattern seen in the unmanaged image on-screen.
>   In unmanaged mode on-screen, the blues tend towards violet, which is
>   what they do when printed.
>   CMY are all less saturated unmanaged on-screen, and printed.
>
> In the gutenprint plugin, the printer command being issued is
>   lp -s -d 'Epson_Stylus_Pro_3880' -oraw
>
> I also have the test image from Cone Color
>   http://shopping.netsuite.com/c.362672/site/test-image.zip
> and the two test prints they supply which are supposed to be color-corrected
> and should match epson inks very closely.
> If I use the Cone Color test image and compare the output to the sample 
> cone-color k3 ink sample, there is clearly too much yellow in the skin-tones.
>
> Any help / hints would be greatly appreciated.
>
> Thanks,
>
> Gary
>   
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