[argyllcms] Re: how many patches, profiling Epson printers

Hello list, hell roger
The GCR approach gives a better greybalance, and the change of colors for different lightnings is a little (!!) bit smaller.

The problem are the CMY-Inks in Ultrachrome.
Lets look, if Ultrachrome K3 is a step forward.

If I have time, I plan to make following test:

- print a teststrip like FOGRA mediawedge on different paper / ink combinations with different GCR for the media-profiles

- measure the strips spectral

- calculate Lab-values for differnt lightning conditions
(A, D50, D75)

- calculate Delta E for every strip-sample for the different lightning conditions.

paper/ink combinations with bigger sensitivness to different lightning conditions should produce bigger Delta E, than such ones with lesser sensitivness.

It would be also an test, how different GCR-settings could may be lead to a less sensitivness to lightning conditions.


Greetings
:-) Jan-Peter



Roger Breton schrieb: 
So my result is: build a greybalance with less CMY as possible for Epson
Ultrachrome.

:-) Jan-Peter 


Less CMY as possible? And consequently more black as possible. You think
that this Heavy GCR minimizes the color inconstancy of the UC inks? Have you
noticed that your GCR proofs to be relatively "insensitive" to different
lamps, i.e. the color appeance of the proof varies less?

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



Other related posts: