Re: basICColor_Testimages_2007
Re: basICColor_Testimages_2007
- Subject: Re: basICColor_Testimages_2007
- From: email@hidden
- Date: Fri, 23 May 2008 09:01:41 +1000
Roger,
You said...
>
> I find particularely interesting how different profilers can
> seemingly
> expand and contract the gamut of the same printing press when
> converting
> from Lab. I use SWOP2006_C3 profiles from Monaco, Kodak, PrintOpen,
> ProfileMakerPro, TGLC and basICcolor (will study ColorProfilerSuite
> from
> Fuji later).
These appliactions are not CHANGING the gamut of the press. They are giving you different results
from the same charaterisation data depending in the settings in the application. These results may or
may not be within the gamut of the press which can only be altered by printing conditions; ink, paper,
press and process not to mention the predilictions of the press operators and the working environment.
In other words they may be erroneous.
>
> I particularely like the
> "TestingSeparations_ChannelAllocation-en.tif".
>
> Selecting different output profiles in GamutWarning, in Photoshop,
> leads me
> to believe that some profilers are able to extract more or less
> colors out
> of the same dataset. To see this for yourself, try toggling
> GamutWarning in
> the View menu and then activate ProofColors > Setup and select a
> different
> SWOP2006 profile to study in the Device to Simulate menu, leaving the
> RI
> constant (I like Perceptual).
>
> My question is this: are the differences in gamut we're seeing real?
>
> Roger Breton
All you are seeing here are different (erroneous?) results generated by the application using different,
possibly inappropriate conversion settings. What matters is that you produce an optimised result that
the press is ACTUALLY able to achieve.
It is quite possible to generate differen relative CMYK values (that is, profiles) which achieve the same
colorimetric result. This is why you will not find any CMYK numbers inside an ISO standard. You will
only find them in profiles generated from charactersiation data that conforms to the tolerances in the
standard.
Mark Stegman
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