New subject: ECI-EN Digest, Vol 29, Issue 1: ISO12647-2 and Hexachrome colors (M. Frank)

1 Jul 2008

      Hi,

...
 1. We are having some difficulties reaching the
secondary colors (RGB), any suggestions? 
1. In a offset press I presume, reaching RGB: trapping issues I guess.
We have had problems to reach good, same or better in comparism to ISO values, for
secondaries (RGB: CM, MY, CY) in a certain brand of presses. 
We have in the study used same and also different inks, all within the ISO standard,
different rubber blankets, some ISO certified and some not and a variety of papers. The
conclusion and the common denominator for the problems is at the moment a certain kind of
press brand.
I will not mention the brand since the study is still going on. The press manufacturer is
aware and are trying to prove themself "innocent".
We believe at the moment that it is a water issue: the construction of the water
distribution. If not it could be a chemical issue or a pressure issue (plate/blanket).
If using exactly the same inks, blankets and paper in press brand 1 and 2 we reach
trapping values for all secondaris above 90% (!) and with press brand 2 we are below 70%
on two colours and at 55% for one colour.

Conclusion: you might have a trapping problem.

Could you please describe your setup for us? Brand of ink, press etc.

2. Nothing to add here. We use expensive high pigmented CMYK ink at some sites and are
doing very well and print a larger gamut than ISO (which is the goal), covering much more
of the Pantone colours than we do with normal ISO inks and therefore we can also simulate
(proof) ISO in the press. In other words, we do not feel that we needed to go to
Hexachrome. It would just lower our productivity etc.
Not saying that hexa is cool though. It is, for sure, but the market is to small, for us
anyway.

Cheers
Alter Schwede

On Tuesday, July 01, 2008, at 12:02PM, &lt;eci-en-request(a)lists.callassoftware.com&gt;
wrote:

>Today's Topics:
>
>   1. ISO12647-2 and Hexachrome colors (M. Frank)
>
>
>----------------------------------------------------------------------
>
>Message: 1
>Date: Tue, 1 Jul 2008 11:09:09 +0200
>From: "M. Frank" &lt;m.frank(a)get2net.dk&gt;
>Subject: [ECI-EN] ISO12647-2 and Hexachrome colors
>To: &lt;eci-en(a)lists.callassoftware.com&gt;
>Message-ID: <00a201c8db5a$1f6e6fd0$2101a8c0@dtp>
>Content-Type: text/plain; charset="iso-8859-1"
>
>We are currently printing according to the ISO 12647-2:2004/Amd:1 standard.
>
...
 1. We are having some difficulties reaching the
secondary colors (RGB), any suggestions? >
>2. We want to print Hexachrome colors (orange and green). Can anybody help with some
Lab values (papertype 1 and 2)?
>
>Regards
>
>Mikkel Valentin Frank

Re: [ECI-EN] ECI-EN Digest, Vol 29, Issue 1: ISO12647-2 and Hexachrome colors (M. Frank)