Re: Colorsync-users Digest, Vol 12, Issue 80
Re: Colorsync-users Digest, Vol 12, Issue 80
- Subject: Re: Colorsync-users Digest, Vol 12, Issue 80
- From: Mike Stewart <email@hidden>
- Date: Mon, 06 Jul 2015 09:15:12 -0500
Jan-Peter: Thanks for the reply. We usually receive stock from the printer
themselves and as such we don't have much or any say in the stock used for
final printing. As you say, with uncoated stocks high in OBA's; not too
many stocks actually fit within ISO specifications for either coated or
uncoated. We proof on the actual stock using an Indigo press. Since the
inks used on the Indigo do not match the colourants of ISO specified
printing inks; we must use colour management to simulate the outcome on
these out of spec. papers.
Seems like the Idealliance is going the route of substrate calculated data;
and it looks to me like Fogra is still possibly going the individual ICC
profile route. I may be wrong; but that is my perception. I have followed
the Fred15 Project from its inception and actually have made use of the
Fogra52 profile where and when paper stocks fall within the Fogra52 numbers.
If we use Fogra52 to manage colour on stocks that fit within its tolerances
and print a colour bar on each proof - what do I tell the printer what
specification I have printed to and how do I prove it via the colour bar on
each proof?
I don't believe that Fogra52 has actually been officially released; but it
does work quite well for those papers falling within its tolerances. i have
a database of over 130 uncoated stocks we are currently proofing on for
Asian, European and North American printers we currently deal with. The
paper white of these stocks varies. Some will fit within Fogra47 and others
within Fogra52. Most are somewhere in between - what do I do with those?
That's where the substrate calculator comes in handy; but obviously I end
up creating a new dataset and from there a new profile (if needed). How do
I tell a printer my proofs are somewhere between Fogra47 and 52 and they
shouldn't have any problems matching on press. I would have to send them
the dataset (or newly made profile).
Thanks - Mike Stewart
On Fri, Jul 3, 2015 at 2:00 PM, <email@hidden>
wrote:
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> 1. Re: dealing with printers (Jan-Peter Homann)
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> ----------------------------------------------------------------------
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> Message: 1
> Date: Fri, 03 Jul 2015 12:46:22 +0200
> From: Jan-Peter Homann <email@hidden>
> To: email@hidden
> Subject: Re: dealing with printers
> Message-ID: <email@hidden>
> Content-Type: text/plain; charset="utf-8"; Format="flowed"
>
> Hello Mike,
> You raise some interesting questions. From my personal point of view, a
> workflow with substrate calculated data is currently fine for a inhouse
> workflow, with proofing and printing in the same company or with a very
> close cooperation between prepress provider and printer.
> It does currently not fit the blind exchange of data and proofs based on
> international standards (ISO) or international specifications (GRACoL,
> PSO etc... )
>
> ESpecially in the uncoated area, we have the case, that current
> standards and specs are not addressing papers with a lot of optical
> brighteners.
> Instititutions like e.g. FOGRA / ECI are working intensive on this issue
> and I guess also Idealliance.
>
> See e.g. http://www.eci.org/en/projects/fred15 scrool down and have a
> look at FOGRA52 data
>
> Regards
> Jan-Peter
>
>
>
> Am 17.06.2015 um 19:19 schrieb Mike Stewart:
> > Now that we are moving to Substrate Calculated Data sets based on paper
> > white; how on earth do we communicate this to printers. Before OBA's we
> had
> > GRACoL, Fogra47 - just to name a few. We would colour manage our proofs
> to
> > GRACoL or Fogra47 (or some print specification), place an Idealliance
> > colour bar on each proof and the customer/printer could measure the
> colour
> > bar to see if we were in compliance or not to the particular
> specification.
> >
> > Now we start from GRACoL Uncoated 2013, change the Paper White values,
> > create a new Data Set and proof to the new data set. Our colour bar on
> each
> > proof now becomes useless as it will never match to the original GRACoL
> > Uncoated 2013. How do we communicate this to a printer in Asia. How can
> > they now trust our proofs. Do we give them a small single row Press Type
> > Colour Bar that prints within the job itself and also give the printer
> the
> > specs. for that colour bar. If so, what are the specs. of that colour bar
> > (C,M,Y,K,R,G,B, grey balance swatches, etc). Data for that file would
> have
> > to be colorimetric and not solid ink and dot gain values I'm guessing.
> >
> > Thanks
> > Mike Stewart
> > _______________________________________________
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> --
> Homann colormanagement tel: +49 30 611 075 18
> Jan-Peter Homann mob: +49 171 54 70 358
> Herzbergstr. 55 www.colormanagement.de
> 10365 Berlin mailto:email@hidden
>
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