Re: Changing black generation in standard profiles
Re: Changing black generation in standard profiles
- Subject: Re: Changing black generation in standard profiles
- From: Liane May <email@hidden>
- Date: Mon, 29 May 2006 14:56:44 +0200
Hi,
the same procedure like you do in ColorLab would be applied
automatically, when doing the following in the PM5 Printer wizard:
- Select a desired chart, e.g. ECI2002, in menu 'Reference'
- Select the desired ICC profile in menu 'Sample/Import ICC profile...'
The previously selected chart will now be converted to LAB (abs.) and
the resulting data will be used as 'measurement data'.
Best regards,
Liane May
---
At 12:28 Uhr -0400 27.05.2006, Terry Wyse wrote:
Hey Marco,
One method to do this that I've used successfully is to take the
existing profile, convert it to Lab using absolute colorimetric
rendering and then use this dataset to build new profiles with
different amounts of K generation, total ink, etc.
The method I've used is to open the CMYK profiling chart of your
choice in LOGO ColorLab (open the reference/device values data file)
and simply convert to Lab using the Filter:ICC Profile Conversion
menu. Use your profile as the source. If you don't choose a
destination profile, it will default to Lab. Save the resulting Lab
data as text and then use this in ProfileMaker. If you want to use
the data in MonacoPROFILER you MAY have to reorder the data to get
it to work (and of course use a STANDARD chart like ECI2002 Visual).
As I recall, a simple "swap rows/columns" and then mirroring the
data
(you can do all this easily in ColorLab) should result in a data
file that works with PROFILER.
Using this method, I've done EXACTLY what you've described. I've
even done this to verify that SWOPv2 is indeed using TR-001. The
only "issue" is that your somewhat at the mercy of the accuracy of
the ICC-to-Lab conversion but anytime I've checked my profile-to-Lab
conversion back to the actual measurement data, the accuracy has
been much less than 1 delta E which seems reasonable to me.
Good Luck!
Terry
On May 27, 2006, at 1:22 AM, Marco Ugolini wrote:
Dear friends and colleagues,
Does anyone have any pointers on how to generate versions of standard
profiles -- like US Web Coated (SWOP) v2, or US Sheetfed Coated v2, etc --
in which the black generation is higher than is currently the case?
From a cursory analysis of the neutral rendition of these standard profiles
as viewed in ColorShop X, black generation starts around 35-40%, proceeding
according to what looks like light GCR.
So, what can one do if one wishes to increase the black generation in order
to make it easier to keep neutral tones neutral on press? Is there such a
thing available somewhere as a measurement data file (colorimetric or
spectral) from which to produce a version of a standard profile with higher
GCR using ProfileMaker, for instance?
Thank you.
--------------
Marco Ugolini
Mill Valley, CA
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