Spot Colors
Spot Colors
- Subject: Spot Colors
- From: "DuWayne Rocus" <email@hidden>
- Date: Sun, 1 Jun 2003 22:18:21 -0400
Graeme Gill Wrote:
I can't really agree with you. Our systems seems to work very acceptably,
and it simply looks up the L*a*b* for each spot color, translates
it to device space using the devices ICC profile, and prints it.
Having never seen your rip I will take a stab in the dark.
1) It requires that you have a Pantone license for your look up tables(Unless
you do a BestColor search/replace and it has limited name variants)
2) Trapping the names of Spot colors gets difficult because you have a lot of
tables to deal with the name variants from Quark, Corel, Illustrator. Its
about 15,000 entries for coated / uncoated with name variants
A lot of other rips also trap spot color names some better than others.But it
gets messy and flawed.
My Roland's have 6/8 Colors with Orange & Green Hexachrome that will print
Pantone spot color at 97% accurate signed off by Pantone. The actual
distribution is about 1.7 avg delta E - a dozen or so up to 5 delta E and a
purple out a 12 delta.
Wasatch - Will trap colors but end-user has to define all the tables(Getting
lab values for pantones which requires hacking the tables out of something or
measureing swatch books will introduce errors that when gamut mapped will be
an issue ) Defining Device colors can only be defined by CMYK So much for OG
ink. It will also process via lab through output icc. It spot lookup table
looks up all colors not just spots , so if there is a few graidents or rainbow
graident defines in CMYK you have lots of entries to sort through.
Best Color - Great program - Can Trap spot colors when you print seperations
and has a lookup table that define labs of "Spot" Colors. Enduser would have
to deal with the name variants. The big flaw is that you must print
separations, the problem is that it would require all raster data contained
with in a PS file to be defined as CMYK . That means raster data will not take
advantage of the Hexachrome or even the high gamut of inkjet inks which can
match more pantones that press inks unless you take apart a file a preseperate
the raster data to hexachrome. So far one of the best solutions I have seen.
Photoprint Server - Depending on the version it has a reasonable chance. But
no license - end-user would have to define the lookup tables. Previous
versions required end-user to enter device color(aka cartridge values for
CMYKOG) the only data available is for Pantone coated Spot colors on one
material at one resolution. Current version will not allow an outside ICC
profile for Gretag or Monaco etc... Newest Beta will.
PerfX Color Recipes - I have only read the details on the web and from a
recent post(waiting for a tech support call on Monday). It will create a PDF
or PS file so you can print your own custom swatch book calculated from labs &
output icc etc.. Possible flaw is that you have to define a source space in
your rip for the RGB or CMYK or ??? data. Most of the source spaces are too
small - Pantone 101 yellow has a hugh B value.The source space will trash the
data or to have a wacky source space in your workflow. Even passed it through
lab you can't define lab spot color in illustrator. It requires a designer to
enter correct RGB/CMYK/Hex values for the Pantone/LAB. Why do we need Pantone
again? It looks like a good product to make swatch books and reference tables
to put into a lot rips.
Without a pantone license in the rip, tables defined, a way to trap the
pantone names correctly without having to take apart files, and no wacky
workflows, an avg users has very little chance getting accurate pantones. A
Color savvy person would also have a big project on his has to build all the
tables required
I haven't seen a rip that will print pantones correctly they all have there
flaws and a lot of work for an smart end-user.And from the number of response
I received from my post no one else has either.
DuWayne Rocus
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