Re: HP20PS and Pantone
Re: HP20PS and Pantone
- Subject: Re: HP20PS and Pantone
- From: Henrik Holmegaard <email@hidden>
- Date: Mon, 28 Jan 2002 12:36:08 +0100
"publix team" <email@hidden> wrote:
If you want to output separated postscript forget about the pantone
matching as it will not work.
If you are asking the inkjet to simulate the behaviour of a press
when the press prints a spot color on a separate plate (with
knock-out if the spot color sits on another color), then the 10ps /
20ps / 50ps do that using the certified Pantone values. If you are
asking the inkjet to simulate the behaviour of a press when a spot
color is overprinted, then the 50ps does that using 'Spot Color
Emulation' command but the 10ps and 20ps don't, at least as far as I
know.
Whether the match is good or bad depends on several parameters:
a. the age of your Pantone swatch guide viz guides older than year
2000 reflect non-standard printing conditions with yellows paper, 150
line screening and CMYK instead of KCMY ink rotation, while guides
younger than 2000 reflect brighter whiter papers as you would find in
the ISO set, 175 line screening and KCMY ink rotation,
b. the particular Pantone ink chosen because two out of three are out
of gamut for process ISO 12647-2 paper type one and somewhat fewer
for the larger gamut of CcMmYK inkjets,
c. the taste of the person or persons who matched an out of gamut PMS
to the gamut of the inkjet ink and paper combination (e.g. a
remapping of the color can be for lowest dE or 'best visual match'
which means that one's own bias rules),
d. whether the color is printed solid or printed as a tint percentage
(whether you have Lab values for PMS inks or you have prebuilt CMYK
conversions for PMS inks, the principle is that they only hold for
the ink printed solid cf. the ProfileMaker ColorPicker 3.1 manual).
If you want the CIE Lab D50 values for Pantone libraries, just
download the freeware Eye-One Share, launch the application, browse
for the PMS color you want, select the profile for your inkjet /
paper combination and read both the Lab and the CMYK equivalents. You
can use Pshop6 or InDesign2 to check the automatch Eye-One Share
returns, if you like.
Hope some of this helps, but I'm not yet up to speed on the 10ps /
20ps / 50ps family, lots of poking around under the hood to do still.