RE: Changing black generation in standard profiles
RE: Changing black generation in standard profiles
- Subject: RE: Changing black generation in standard profiles
- From: Marttila Jouni <email@hidden>
- Date: Mon, 29 May 2006 08:14:39 +0300
Terry
I have ColorLab 2.77 but I seem to be missing something in your instructions
E.g. in Filter menu there is only sub menus "ICC" amd "Conversion" but no
ICC Profile Conversion
Would it be possible to get more detailed info how this goes
BR Jouni Marttila
>-----Original Message-----
>From:
>colorsync-users-bounces+jouni.marttila=email@hidden.c
>om
>[mailto:colorsync-users-bounces+jouni.marttila=m-real.com@lists
.apple.com] On Behalf Of Terry Wyse
>Sent: 27. toukokuuta 2006 19:28
>To: Marco Ugolini; 'colorsync-users?lists.apple.com' List
>Subject: Re: Changing black generation in standard profiles
>
>
>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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