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: neil snape <email@hidden>
- Date: Sat, 22 Feb 2003 10:31:13 +0100
on 22/02/2003 3:38, Angus Pady wrote :
>
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?
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.
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.
Neil Snape email@hidden
http://mapage.noos.fr/nsnape
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