On Mon, 09 Apr 2018 19:29:16 +0000 gimp-user-list-requ...@gnome.org wrote:
> hi gabriele, > color management has been a mystery on many a list. i had a discussion on > the scribus list many years ago when i mentioned my solution to my color > management problems. i was told i was wrong, that i needed to calibrate all > of my hardware and make a profile of each. i was a photojournalist in a > former life and i teach photography with emphasis on light and lighting and > color temperature. > > when i first embarked on my color theory journey, i was designing brochures > and flyers as a freelancer for a company in new orleans, la that did > meeting and convention planning (as well as designing their web site). > after much research and question asking, i lit upon color.org. i went there > and downloaded 2 color profiles (sRGB_IEC61966-2-1_no_black_scaling and > SWOP2006_Coated3v2). i later ran across a cmyk profile when i used linux > and saved that profile. these color profiles have the same d50 color temp > (5000k). with progress, the rgb profiles at color.org are at version 4; i > have not tested these profiles. > > here are my hardware and software setup for my systems (win, mac and > linux). i copy the two color profiles to the appropriate profile folders > according to the os and set them as the default color profiles for the > system. then i set the rgb and cmyk profiles as default in all of my > graphic software. i also set the rgb and cmyk profiles as default to > printers, scanners and other hardware attached to the system that uses > color profiles. > > i will usually make a "straight" print to preview what changes in color, > exposure, shadow, mid-tone and highlights need to be made. i have found the > color does not vary much from what the thumbnail on the screen presents. > > i would be happy to provide these profiles to you or anyone else on the > list if you send me a private email; unless, the administrators will allow > the attached profiles. > > i would be interested to learn if your results are similar to mine. there > is much more to color management that i did not say to the argument that > was raised on the scribus list. > > i hope this helps you find your way on your journey in the land of color > management. > > many greetings > kdd > > On Thu, Mar 15, 2018 at 4:46 AM, Gabriele Piccini <dafras...@gmail.com> > wrote: > > > Hi All, > > I think I'm wrong when I print from GIMP because I have a very yellowish > > print....a very yellow color cast in neutral zones. > > > > I created a printer profile with ArgyllCMS and seems it works well because > > if I test it with xicclu command (for who known Argyll) with neutral Lab > > values I got neutral values (Lab->RGB output->Lab). > > The issue arises when I print but I think to make a wrong way: > > > > Ok, what I did: > > > > I download a proof image from internet with Prophoto color profile. > > > > When I load in GIMP I keep ProPhoto therefore RGB device values are > > ProPhoto RGB. > > Then I convert the image into printer profile and I think the values are > > converted to RGB values of printer profile based on Lab values of ProPhoto. > > > > Now I should have an image with device (printer) RGB values to send the > > printer , haven't I? The printer if matches the ICC profile I created > > should "translate" those RGB numbers into colors. > > > > But the image, I view correct on display is very yellowish on the paper. > > > > Is this workflow correct fro printing color managed in GIMP? > > Or am I missing something?? > > > > I do not know if I'm clear ( English is not my language ?) > > > > Cheers > > Gabriele _______________________________________________ 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
