Re: Contract proofer combo
Re: Contract proofer combo
- Subject: Re: Contract proofer combo
- From: Henrik Holmegaard <email@hidden>
- Date: Tue, 13 Mar 2001 19:48:02 +0100
There are also cases where clents want to proof Scitex CT/LW and TIFF-IT.
Scitex CT is supported in iQueue. But it is a legacy color blind data
format. It doesn't support embedding of ICC profiles, so the incoming
pixels must be assigned an assumed source ICC profile, and the
outgoing pixels can't be tagged with the destination ICC profile. It
doesn't support Lab either. All this is just as in BatchMatcherPS
described in a whole string of posts.
TIFF-IT is a debatable as industry standard format and is losing to
PDF. The PDF/X-(add a figure -:)) specs speak of blind exchange of
CMYK. Of course, Photopop and Disintegrator may yet get your PDF, but
folks on the ECI list here in Europe are talking about a solution to
that, too -:).
Canned spot color databases are fine, but for good metallic simulation, you
need to read and correct each color in my experience.
Yes.
Also, the spot colors need to be calculated
completely independently of the simulation profile. If I print a spot
color, I want it to come out exactly the same whether I am simulating
gravure or offset.
Hmm...this sounds odd to me. If you print the same spot ink on two
different papers, the colors will look different. If you print the
same spot ink at different screen densities, the colors will look
different (the finer the screen the darker the color). I did a
calling card once for someone who insisted on blue PMS and a creamy
uncoated card stock, and the color looked magenta. Mechanically the
printer had done what he was supposed to do, but it also showed that
premixed inks and fan guides aren't going to get you device
independence -:).
What you can do is look how a particular PMS defined as Lab
reproduces in your printer / press gamut. This you can do with
VectorPro (which is actually really cool and has nice sorting
features, e.g. 'Give me all the PMS coated spots with lower than dE 3
for this profile' ... neat) or GretagMacbeth ColorPicker which is
more about measuring and tuning your libraries. VectorPro let's you
pick the intent, ColorPicker is hardwired to Absolute Colorimetric
which is the only intent you don't get interpretation in (well, all
intents have interpolation as I was reminded of a while back, but at
least AbsCol doesn't have any remapping / interpretation of lightness
or saturation or colors). Then you can see where your spot color lies
in the process color space, or in the proofer color space. Sort of a
fair warning of troubles ahead -:).
Tiny differences in tone in a ceramic or
furniture will put you into different models or series.
I looked at some French facial compacts recently, five arranged in a
circle in a perfume display. I wonder what the dE was from one to the
other. Too small for comfort in any case -:).
--
Henrik Holmegaard
TechWrite, Denmark