Re: Color Bars on Inkjet Proofs
Re: Color Bars on Inkjet Proofs
- Subject: Re: Color Bars on Inkjet Proofs
- From: Martin Orpen <email@hidden>
- Date: Wed, 31 Oct 2007 13:20:27 +0000
On 31 Oct 2007, at 12:33, Richard Booth wrote:
This is a question for any printers, sheet fed or web, out there.
Do you
demand color bars on contract proofs made from inkjet printers? If
so, what
is that you could measure on a color bar that would tell you that the
supplied proof is in your printable gamut? We supply contract
proofs from
Epson 4800s, driven by EFI rips and set up to emulate average sheet
and web
conditions and have no problems getting reasonable matches to our
proofs.
Some of our major print vendors have no need for color bars while
others
insist on them. Any thoughts?
Here in the UK/Europe the process works reasonably well. You purchase
a license to use the FOGRA media wedge and then calibrate your RIP to
match the ECI profiles. Providing you are using an approved paper
stock and don't exceed the (lax) dE requirements then you've got
yourself a proper "contract proof" rather than a questionable ink jet
print.
If you don't have colour bars I can't see how you could use the term
"contract proof" as you've no way of independently verifying the
accuracy.
We use EFI RIPs to drive Epson 9600s and handle everything from sheet
fed to newsprint proofing. The RIP has a proof verifier module that
can be incorporated into the print queues automatically. You just
need to wait for the ink to dry down and then swipe the wedge with an
EyeOne or something similar.
Calibration is pretty easy because it requires little more than a few
iterations of L*a*b* correction curve tweaking - 3 iterations will
normally give you matches of less than 2dE if you are calibrating a
new queue from scratch.
We'd like to produce contract proofs for the US as well, but last
time I looked into it I couldn't find any agreement at all on US
"average" print conditions :(
--
Martin Orpen
Idea Digital Imaging Ltd
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Colorsync-users mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden