Laminate profile
Laminate profile
- Subject: Laminate profile
- From: Roger <email@hidden>
- Date: Mon, 03 Aug 2009 12:39:52 -0400
Thank you Nils Johansson,
I think I follow your reasoning. The only step I was forgetting about, which
you so kindly suggested, was to make a proof of how ugly the original
client's separations would look, once laminated.
So, your steps are:
> 1) Make an ICC-profile based upon a colour chart not being laminated
> (this would be the printing press' ICC-profile)
I wonder to what extent I am shooting myself in the foot by *not* using the
custom press profile as opposed to plain, vanilla GRACoL2006_C1 profile?
There is an average 3.5 deltaEab difference between the actual press profile
and GRACoL2006_C1. Maybe I could make a first conversion from GRACoL2006_C1
to myCustomPress profile, and then make a conversion from myCustomPress
profile to myLaminateProfile?
> 2) Laminate the test chart from step 1 and make another ICC-profile (we
> call this the laminate-profile).
Got that step right.
> 3) Use the laminate-profile as a destination (target) profile when
> converting your pictures and when producing your plates.
Yes, this make sense as this is the final color space into which the
original imagery will be viewed in.
> Perhaps this sounds
> strange, but
> this should produce the best colour match between the digital colour
> data and
> the final, laminated result. Converting to this ICC-profile should
> eliminate
> the change in colour when the prints are laminated.
I agree there should be a close match between the client's original and the
final laminated results. And it's also good to convince us that the whole
procedure will actually produced the expected results.
> 4) However, to show the printer operator which colours he/she should
> aim for,
> you cannot give him/her a proof based upon the laminated-profile as the
> produced prints have not undergone any lamination yet.
Right. That wouldn't be smart.
> Instead you must print a proof where you show how the colours should
> look when
> unlaminated. This you do by assigning the press' ICC-profile to your
> already separated pictures in step 3, and then make a proof.
You seem, this traces back to my first comment, above. If I proof using the
GRACoL2006_C1 profile then, knowing that the press is already 3.5 deltaE off
GRACoL2006_C1, maybe once laminated, the sheets will be off my 3.5 deltaE
also?
What do you think?
> Similarly, if you want to simulate how the laminated result would be
> when using
> the press' profile as the destination profile (which I believe most
> printing
> houses do), you should assign the laminate-profile to your separation
> and proof that.
Yes, that will show what kind of color shift will occur as a consequence of
lamination.
> I hope you could follow my reasoning. As I said, we haven't had the
> opportunity
> to test this in practice, but we believe this should work pretty well,
> at least
> theoretically, for CMYK-data.
Yes, I concur with your reasoning.
> If you want, you can download our report as a draft from
> http://www.hej.st/Laminate_draft.pdf. It is written in Swedish, but has
> an
> English summary. I will try to post an English translation in a very
> near future.
I still need to brush up on my Swedish :-)
> Try to contact the library at Dalarna University (http://www.du.se) and
> ask for the report, if the link doesn't work.
OK. I won't hesitate.
> Nils Johansson
> Student at Graphic Technology Dept., Dalarna University, Sweden
Thank's / Roger
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