Re: Review of Large-Format Inkjet Contract Proofers
Re: Review of Large-Format Inkjet Contract Proofers
- Subject: Re: Review of Large-Format Inkjet Contract Proofers
- From: Graeme Gill <email@hidden>
- Date: Wed, 07 May 2003 14:40:15 +1000
Terry Wyse wrote:
>
Lots of profile editing if you want the best possible match. The problem is
>
mainly with the Yellow hue of the Photo Dye ink; it's very "orange" compared
>
to an offset press yellow. The result is a yellow with quite a bit of cyan
>
added by the profile transform in an attempt to get a colorimetric match.
>
This results in pure offset yellows looking very dirty. If there's a way to
>
combat this without extensive profile editing, I haven't found it yet.
Use a different profiling package, one that has a gamut mapping
weighted to "nearest" color, rather than "same hue, reduce
saturation" type algorithm that most still seem to use.
>
I thought you said it had Photo dye inks? If it's pigment (Archival Ink for
>
the 10000), it won't be any easier as the archival ink has a much smaller
>
color gamut compared to photo dye making it difficult to attain SWOP color
>
gamut. The reason Ultrachrome (UC) ink profiles well is the fact that it's
>
pigment, so the color's stable, and it has nearly the same color gamut as
>
the dye inks. The clincher is that the UC pure yellow is much closer to
>
offset yellow so pure yellows and greens are much cleaner.
I think it's an exaggeration to say that (Epson 10000CF) pigment inks have
a "much smaller" gamut. It is smaller in places to the 10000 dye inks, but still
large enough for (say) a very satisfactory proofing profile that emulates
well known chemical proofing standards (I've got pictures of the gamuts
I can email you, if you're really interested). I think it may be true
than many readily available profiling packages do a poor job of exposing
the full gamut of the pigment inks.
>
Pretty much all of the above. Just last week I replaced an HP5500 with a
>
10600UC at a customer and they couldn't believe the printing quality and
>
color matching difference.
My main impression of the difference between the Epson 10000/10600
and the HP is that they are about on par in terms of gamut, color
accuracy depends on profiling accuracy, and the main distinguishing
feature is that the HP has less banding (due to better mechanical
stability and its automatic nozzle substitution) and noticeably
coarser dots (inherently lower resolution). The latter may have
an effect on the color, in not allowing as much GCR to be used,
compromising neutral robustness. On the other hand, the Epson
has the problem that if you use lots of black, it emphasizes
its banding problems.
Graeme Gill.
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