Hexachrome proofing (was Re: Rip Software)
Hexachrome proofing (was Re: Rip Software)
- Subject: Hexachrome proofing (was Re: Rip Software)
- From: Matthew Kelly <email@hidden>
- Date: Thu, 2 Feb 2006 11:58:55 -0600
On Feb 1, 2006, at 7:20 PM, Graeme Gill wrote:
Matthew Kelly wrote:
I worked with the Roland FJ500 and the same ink set and used the
ColorBurst Prepress RIP, which handles the 8 colors quite well,
and allowed one to apply curves to each of the colors. It also
allows the creation of custom spot color values.
The reality was that I was never able to get a proofer gamut that
was any better than what I was getting from a Sherpa43 CMYKcm. I
tried various papers and Pantone Vantage inks. I used
ProfileMaker with the multicolor plug-in for the hifi profile.
I had a play with a Roland 8 color at one stage (CMYKOGcm), and what
I noticed was that Orange and Green in themselves did not expand
the CMYK gamut at all significantly. What did expand the gamut
noticeably,
was combinations of the non-CMYK inks, e.g. the light inks in
combination
with Orange or Green. What this told me, was that if the profiling
software
uses a formalistic, by the numbers type orange and green separation
(ie.
substitutes Orange for Magenta and Yellow, substitutes Green for
Cyan and Yellow), and a typical "use the light inks at light tints
of Cyan and Magenta" separation, you won't see much improvement
in the overall gamut.
That is an interesting deduction, which may explain why I never got
anywhere.
I wonder if anyone on this list could enlighten us as to how the
multichannel Profilemaker, which I was using, interprets the
additional colors on an 8 color proofer.
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