Re: RIP Pantone support
Re: RIP Pantone support
- Subject: Re: RIP Pantone support
- From: Henrik Holmegaard <email@hidden>
- Date: Wed, 04 Sep 2002 11:43:59 +0200
faro mojahedi <email@hidden> wrote:
>
Can somebody please explain to me how RIPs(Best,
>
ColorByte, etc) running on inkjets support Pantone
>
colors.
You might find it useful to distinguish between host applications generating
PostScript / PDF, production RIPs, and proofing RIPs.
If the host application generates spot to process conversions, then these
conversions may be the same for all printing conditions or they may be
customized for each printing condition (depending on whether the host
application in one way or another passes the conversion through the ICC
profile and rendering intent that describe the final printed page).
If the host application generates spot color plates, and the production RIP
applies spot to process conversion, then the same situation occurs.
In both cases many spot colors will be out of gamut for the given printing
condition, which means you have to make a choice about how best to reproduce
the color of the premixed spot ink (by lowest dE or by closest visual
match). Spot to process tables are licenced by software publishers for that
reason: The manufacturer of the spot ink system takes responsibility for the
closest process match under specified printing conditions (KCMY rotation,
paper color, etc).
If the host application generates spot color plates, and the production RIP
does not apply spot to process conversion, then you have the problem of
proofing these named color callouts.
Proofing RIPs for digital color printers exploit their large native gamuts
to simulate spot color inks in their composite CMYK color space, and do not
as a press print custom premixed inks.
If the spot color is not converted to process in the host application or in
the production RIP, but is to be proofed on the composite digital printer,
then there are proofing RIPs with prebuilt tables for the closest visual
match of a given spot color in the color space of paper types and print
modes supported by the digital color printer.
Both for spot to process conversions in the application generating PDF /
PostScript, spot to process conversions in the production RIP, and spot to
process conversions in composite digital proofing RIPs, you sometimes have
the situation that in the incoming job either an unsupported spot color is
called out or a spot color is called out which is supported for other paper
types / print modes except not for your current third party paper.
To generate custom spot to process conversions whether in the PDF / PS
publishing application, the production RIP, or the proofing RIP, you need an
ICC profile for the given printing or proofing process, a spectrophotometer
to measure the color swatch or a premeasured value for the swatch available
in tools like Eye-One Share and ProfileMaker ColorPicker, and a little
editing time.
Hope this helps.
(Hmmm...hit Send or hit Print and reread: Hit Send is quicker -:)).
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