RE: Colorsync-users Digest, Vol 6, Issue 178
RE: Colorsync-users Digest, Vol 6, Issue 178
- Subject: RE: Colorsync-users Digest, Vol 6, Issue 178
- From: Nils Johansson <email@hidden>
- Date: Sun, 2 Aug 2009 22:37:15 +0200
- Importance: Normal
Hi Roger,
When looked into this topic on how laminates affect the colours, I and a
classmate at Graphic Technology Dept. at Dalarna University suggested a quite
basic method on how to simulate and account for the changes in the laminated
colours (however, I do want to point out that we never had the possibility to
test in reality, instead it could be seen as a hypothesis). Perhaps this is
just what Dan Wilson is referring to?
Anyway, the method is as follows:
1) Make an ICC-profile based upon a colour chart not being laminated
(this would be the printing press' ICC-profile)
2) Laminate the test chart from step 1 and make another ICC-profile (we call
this the laminate-profile).
3) Use the laminate-profile as a destination (target) profile when converting
your pictures and when producing your plates. 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.
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.
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.
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.
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.
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.
Try to contact the library at Dalarna University (http://www.du.se) and ask for
the report, if the link doesn't work.
Please, let me know how this works out for you!
Best regards,
Nils Johansson
Student at Graphic Technology Dept., Dalarna University, Sweden
> From: email@hidden
> Subject: Colorsync-users Digest, Vol 6, Issue 178
> To: email@hidden
> Date: Sun, 2 Aug 2009 12:03:14 -0700
>
> Send Colorsync-users mailing list submissions to
> email@hidden
>
> To subscribe or unsubscribe via the World Wide Web, visit
> http://lists.apple.com/mailman/listinfo/colorsync-users
> or, via email, send a message with subject or body 'help' to
> email@hidden
>
> You can reach the person managing the list at
> email@hidden
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of Colorsync-users digest..."
>
>
> Today's Topics:
>
> 1. Re: Correct for a laminate finish (Dan Wilson)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sun, 02 Aug 2009 14:08:53 +0100
> From: Dan Wilson <email@hidden>
> Subject: Re: Correct for a laminate finish
> To: <email@hidden>
> Message-ID: <C69B4E75.5E7CÚemail@hidden>
> Content-Type: text/plain; charset="US-ASCII"
>
> Hi Roger,
>
> Last year I went to the Fogra Color Symposium in Munich and a paper was
> presented on the topic of a magenta colour shift after lamination. It was
> quite interesting.
>
> The other posts which recommend offering the printer a 'bad proof' to match
> the un-laminated colour is the suggested workflow (after profiling same). I
> also agree about doing a 'good proof' for interest/reference to show the
> after lamination colour.
>
> All the advice on this topic was good.
>
> Best regards,
>
> Dan Wilson
>
> >
> > ------------------------------
> >
> > Message: 2
> > Date: Thu, 30 Jul 2009 19:03:21 -0400
> > From: Roger <email@hidden>
> > Subject: Correct for a laminate finish
> > To: email@hidden
> > Message-ID: <017a01ca1169$ef4fe7b0$cdefb710$@ca>
> > Content-Type: text/plain; charset=US-ASCII
> >
> > Hello color folks,
> >
> > I got myself into a real sticky one and hope you guys (and girls) would have
> > some word of advice for this poor soul. I'm just trying to help a friend...
> >
> > The problem is that, in the process of apply a thin matte lamination to a
> > press sheet, all colors on the printed sheet take on an ugly reddish cast.
> > (I'm not sure whether a similar issue was discussed on the list recently?)
> >
> > It's easy enough to make a profile *with* the lamination applied to the
> > sheet. Makes for great ICC output profile. But how to sort of isolate the
> > overall shift of color that happen, as a result of the lamination, in order
> > to come up with a separation that will look ugly to the pressman, but once
> > the lamination applied to the sheet, will start looking "normal" again?
> >
> > Assume the jobs comes in with a GRACoL2006_C1 profile.
> >
> > I was thinking of converting to the laminate profile, first, and then
> > convert to the unlaminated press profile back, but that does not seem right.
> >
> > Any ideas is welcome. Sorry for picking your brains so shamelessly ...
> >
> > Roger
> > ------------------------------
>
>
>
>
> ------------------------------
>
> _______________________________________________
> Colorsync-users mailing list
> email@hidden
> http://lists.apple.com/mailman/listinfo/colorsync-users
>
> End of Colorsync-users Digest, Vol 6, Issue 178
> ***********************************************
_________________________________________________________________
Med Windows Live kan du ordna, redigera och dela med dig av dina foton.
http://www.microsoft.com/sverige/windows/windowslive/products/photo-gallery-edit.aspx _______________________________________________
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