Hello Roger
Can you please explain, how you judge the grey-balance of the profiled
printer ?
- Do you print print a Lab- or RGB-greyscale ?
- Do you have printed reference to match ?
- What is the paperwhite of your profiled paper ?
- What is the paperwhite of your reference (if you have one?)
I´m mainly doing profiling for Epson Ultrachrome in the field of digital
proofing. In this case, it is necessary to use a proofmedia, which has
more or less the same paperwhite as the printed reference, to get a
visual good greybalance.
In the field of printing RGB-data, I prefer media with low amount of
optical brightners resulting to a paperwhite near a=0 an b=0
If you wan´t to print RGB-data on photographic paper with medium or a
big amount of optical brighteners, there is no other way as to tweak the
profile manually.
Sometimes the compensation of optical brightners in Profilemaker or
PrintOpen helps.
** Is there a comparable function in Argyll ? **
:-) Jan-Peter
Dear Jan-Peter,
Yes and no. I have an Epson 4000 here I'm profiling through PrintOpen v5, ProfileMakerPro v5.0.3, Monaco Profiler v4.7.2 and Fuji ColourKit v4.2 and it's never perfect. I always have to perform profile editing to get a good match. Why? I don't know. But there is something non-linear somewhere in the way these UC inks are mixing that defeats the profiler prediction.
The following point is *very* well taken:
One last point to Epson Ultrachrome-printers: For this printers, it is very hard to get a visual nice greybalance.
How widespread is this view, Jan-Peter? No one on the ColorSync List ever admitted to this in public. I guess it depends on a lot of factors. Not so much the fact that the ink behavior is heavily metameric but the fact that, I suppose, a lot of people don't really notice it or complain about it.
I´m getting significant better results by using a strong GCR starting at 0,
so that neutral tones are mainly rendered with black and light black.
Well, this is what I've been lately experimenting with. Traditionnally, on all the inkjet printer I ever profile, I always used UCR. But I found it constrained me too much when editing the profile. So I started to use GCR. I can't say, however, that I find the graü balance better?
Such black generation can only be used, if the printer has additional
grey ink,
Epson 4000 have Black and Light Black.
otherwise the strong black produces a "peppering" in skin-tones (big black dots...)
Yes, like Epson 3000.
greetings from europe :-) Jan-peter
Greetings from Kanada!
Mfg,
Roger Breton | Laval, Canada | graxx@xxxxxxxxxxxx http://pages.infinit.net/graxx
-- --
homann colormanagement ------ fon/fax +49 30 611 075 18 Jan-Peter Homann ------------- mobile +49 171 54 70 358 Kastanienallee 71 ------- http://www.colormanagement.de 10435 Berlin --------- mailto:homann@xxxxxxxxxxxxxxxxxx
