Re: Rip Software
Re: Rip Software
- Subject: Re: Rip Software
- From: Graeme Gill <email@hidden>
- Date: Thu, 02 Feb 2006 12:20:53 +1100
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.
My conclusion at the time, was that noone knows how to create
optimal separations for such ink combinations. This may not
have changed (I haven't had the opportunity to complete my
work on this problem). This lack of ability to exploit extra
non-traditional colorants may well lead to the demise of
devices offering such extra colorants.
Graeme Gill.
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