On 01/31/14 05:05, uga...@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 <g...@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 > > _______________________________________________ > gimp-user-list mailing list > List address: gimp-user-list@gnome.org > List membership: https://mail.gnome.org/mailman/listinfo/gimp-user-list > List archives: https://mail.gnome.org/archives/gimp-user-list > _______________________________________________ gimp-user-list mailing list List address: gimp-user-list@gnome.org List membership: https://mail.gnome.org/mailman/listinfo/gimp-user-list List archives: https://mail.gnome.org/archives/gimp-user-list
