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

Hello Roger
I have done a lot of profiling for proofing on Epson Ultrachrome.
My preferred Paper is FUJI IPP SG, which has a similar whitepoint, which you measured.
My customers mainly have EFI colorproof.

For profiling, I use Profilemaker 5 and Eye One or ICColor

My GCR-settings are
- GCR 4 or maxK (strong GCR)
- Black start 0
- Black width 20 (from 100)

If I use ISOcoated as source-profile, proofing with abs colorimetric or rel col. is more or less the same, because the whitepoint of ISOcoated and FUJI IPP-SG are similar.

simulation of pure offset-grey is fine.


I printed also some RGB-pictures wich contain a neutral motive, an I was satisfied with the result.(Some people would say: add 1% Magenta in the middletone for for a perfect result...)

In former times I used GCR3 (middle GCR) and black start at 40.
In this case, i got a greybalance changing from greenish to reddish.
for Ultrachrome (No problem with HP or Canon-Printers with this setting)

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

:-) Jan-Peter

Roger Breton schrieb:


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.



So you proof RelCol?


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



Right. Like Tecco papers. I tested them once but I can't source them locally
:(


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.



Richtig.


Sometimes the compensation of optical brightners in Profilemaker or
PrintOpen helps.



Sometimes.


If you have measurement Equipment with UV-cut, this also can help. 


I tried with DTP41uv and 530 + UV-cut filter and still no magic.


But beware, that for proofing both source- and target-profile should be
measured with UV-cut. 


Are you sure? If the Source paper has *no* FWA then, in principle, measuring
with or without a UV-cut filter should have no effect. But the proofing
paper often will exhibit FWA.


:-) Jan-Peter 


Regards,

Roger Breton  |  Laval, Canada  |  graxx@xxxxxxxxxxxx
http://pages.infinit.net/graxx






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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


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