Re: Rip Software
Re: Rip Software
- Subject: Re: Rip Software
- From: Graeme Gill <email@hidden>
- Date: Fri, 03 Feb 2006 10:31:30 +1100
Dan Reid wrote:
The Orange and Green inks are NOT designed to increase CMYK gamut. I
guess that's not obvious. LT inks have never in my experience expanded
the color gamut of any printing device I have worked with, including the
Rolands. The LT inks are introduced to create a more continous tone
looking print without hard (sharp) dots of cyan and magenta.
Given that Orange and Green are most often promoted as things
that expand the gamut ("To cover 9X% of Pantone Spot Colors!" -
you know the type of thing.), this is hardly a surprising expectation.
You might be right in assuming that light inks were introduced
to give better results in highlight areas, but what I'm telling you,
is that it turns out that light C & M add to Orange and Green,
in a way that noticeably expands the gamut in some areas.
If you were using the Roland ColorChoice software, as I assume, then
you might as well have used the Epson RGB print driver and gotten
similar results. You need a real RIP that offers good calibration and
proofing options.. As mentioned in previous posts, ColorBurst, GMG,
Oris, Onyx, AbsoluteProof, and EFI ColorProof XF all offer support for
Hexachrome and some allow good proofing of Hexachrome press seperations.
Umm no. I was using our Colorbus RIP that we'd modified to support all
8 channels. That's how I printed my 8 dimensional test chart, and
was able to check out the available gamut using my (rather custom)
profiling software.
Finally, Hexachrome Orange and Green were introduced to not improve CMYK
color gamut but allow a larger simulation of the orignal Pantone spot
color library. Yes and ancillary benefits are better reds, greens,
yellow-greens, skin tones, but that's a nice side benefit not the reason
why Hexachrome was developed.
It seems to me that you're contradicting yourself here. Either Orange
and Green are needed to expand the gamut to cover the spot colors,
or they're not, in which case, why are they promoted as such ?
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.
PM5 MultiColor plug-in and Pantone Hex plug-ins allow RGB (or CMYK)
files to be converted to Hexachrome seperations that will utilize the
extra colorants *if* needed. Just because orange and green is present
doens't mean it needs to be used for every subject and image.
Right, you're confirming my suspicions nicely.
Maybe you haven't noticed the industry trend happening but many
manufacturers are adding extra colorants to their printers and press
setups. I guess the biggest indicator could be GretagMacbeth's
ProfileMaker Packaging product released last year. I have made a pretty
good living working in CMYK+ environments to date. Interesting point of
view.
No, I've noticed the opposite. Roland has been offering machines
without Orange and Green as standard, and Epson has backed away from
Red and Blue in its K3 machines. The way I read it, profiling support
for non-CMYK has been slow in coming, and doesn't work terribly well,
and the printer manufacturers seem to have got tired of waiting.
Let's look at Rolands web page for instance:
Roland SOLJET PRO II V - SJ-1045 - CCMMYK & CMYKLcLm
Roland SOLJET PRO II EX - SJ-1000 EX - CCMMYK x2
Roland SOLJET PRO II V SJ-645EX & SJ-745EX - CMYKLcLm ?
Roland Hi-Fi JET PRO II FJ-540 - CMYK+(LcLm or OG)
Roland Hi-Fi JET PRO FJ-600 - CMYKOGLcLm or CMYKCMYK
So their major emphasis seems to be on the CMYKLcLm ECO-SOL inks,
with their two older Hi-Fi Jet machines offering O & G as options.
The (somewhat old) information I had about the Hi-Fi jets, was that
the Orange and Green were only effective for spot colors (ie. the
separations had been hand tuned to use Orange and Green for spot
colors), while for normal images, Orange and Green wasn't used,
because no effective separation was available.
Graeme Gill.
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