Re: Creating ICCs with pigmented inks
Re: Creating ICCs with pigmented inks
- Subject: Re: Creating ICCs with pigmented inks
- From: Chris Murphy <email@hidden>
- Date: Mon, 1 Jul 2002 07:55:03 -0600
Graeme Gill <email@hidden> writes:
>
Why ? The Dye is seriously unstable compared to the Pigment. The Pigment
>
is certainly my recommendation for proofing on the Epson 10K, and is
>
the system we have just had approved for 3DAP here in Australia
>
(see <http://www.3dap.com.au/proofingsuppliers.htm>)
I haven't seen any data indicating the dye inks are unstable, let alone
seriously unstable, in the Epson 10000. Like any dye based ink from an
inkjet printer, they are susceptible to dry back, fading, and hue shifts
if they aren't used with a paper with a compatible chemistry. Even the
very early Epson die inks, which were notoriously unstable over a 12 hour
period exhibiting gray balance shifts in excess of 18 delta E's could be
stablized to within 15 minutes of drying by using suitable papers (which
at the time were not available through Epson).
The problem with the pigment based inks used in the Epson 2000, 7500,
9500 and 10000 w/ pigment ink option, is that they are extremely
susceptible to metamerism. I have yet to see a print from any of these
printers that would not under drastic shifts in neutrals (saturated
colors are not as affected) when moving between different light sources.
Even 5000K fluorescent would cause this to occur.
>
Why people (particularly in the US) are obsessed with the Dye
>
version of the 10000 is beyond me.
Uhh, because for proofing, it works, that's why. If you want a long
lasting print, go pigment. If you want a reliable short term proof under
5000K fluorescent then go dye. The various press proofing related forums
have been ripe for some time regarding these problems with Epson pigment
inks (the ones in the printers listed). It's a widespread and known
problem.
>
Good luck getting a print to stay the same color with the
>
Dye ink.
For how long? Within 15 minutes of drying, compared to 12 hours later I
measured a negliglbe delta E with an Epson 10000 dye printing on Photo
Luster paper. Naturally if you bake these proofs in the car, or expose
them to sunlight for even 10 minutes there is a measurable change in
color, but analog proofs can do the same thing and so do press sheets.
People in the printing industry are familiar with the need to take car of
proofs once they are printed. Needing them to last 70 years isn't one of
those needs. Not having them go from orange, to pink to green gray
balance when moving between various lighting conditions does not make for
confidence in a proof.
Chris Murphy
Color Remedies (tm)
Boulder, CO
303-415-9932
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