Re: Fuji Pictro Proofer, which profiling chart: CMYK or CMY
Re: Fuji Pictro Proofer, which profiling chart: CMYK or CMY
- Subject: Re: Fuji Pictro Proofer, which profiling chart: CMYK or CMY
- From: Angus Pady <email@hidden>
- Date: Sat, 22 Feb 2003 21:33:24 -0500
> I am using setting up an ORIS rip, the customer wants to mach their
in house Fuji Pitro. I ran the ECI2002 chart to the pictro and
plugged that profile into ORIS as the press profile. The results are
ok except for a few big bumps in the gray scale. My question is -
should I use a CMY chart or a CMYK chart. The printer prints using
> only CMY?
A few things first about the workflow.
If you're using absolute You'll have some backwards problems of paper white.
The L value is quite low on the Fuji stock. I read that they improved this
but only Fuji could tell you in what ways. The paper is also quite blue,
blue-grey so again the absolute rendering will give you unreliable results
compared to a press. Where are the bumps in the grey scale?
The bumps are at the 20 to 35% range and again in the 3/4 tones. What
I am seeing is an big exaggeration of the grayscale on the Fuji. I am
going to try relative to see if that helps.
This printer is using cmy ribbons yet it's running through a rip to convert
and "linearise" the data to a press simulation. Since I have seen very nice
results using the rip as a CMYK device I can't see a benefit of using the
rip to retranslate from data stream CMYK to CMY to PCS then on to whatever
internal format the FujiProofer uses.
That is what I thought but wasn't 100% sure.
The Fuji yellow ribbon can produce fluorescence at certain chroma values
affecting specific spectro and profiling combinations.
As some one else said , linearisation of the Oris rip set up is more likely
the bigger factor in seeing banding. Are the profiles large 16 bit or small
8 bit with few grid points etc.... All affect tonal graduation. Sometimes
smoothing of the data helps this a lot in PrintOpen for example.
I am using the large profiles in ProfileMaker. Do you think the
default would help?
I was very careful in linearizing the ORIS Rip. I lowered my maximum
ink densities to a point where they just hook a bit in ColorThink. I
usually will run a 20 stepped scale for each color measure that in
Measure tool save and import into ColorThink and look at the Lab
plots as well as read densities with my X-Rite 500. By the way it
the printer is a 7600 UltraChrome. I have found the Magenta and
especially the Cyan needs to be reduce a lot.
--
Angus Pady
Digital Solutions
Richmond Hill,
105 West Beaver Creek,
Suite 3, Ontario
L4B 1C6
P: 905-764-6003
F: 905-886-6800
http://www.ColourManagement.ca
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