Re: Adobe PMS-CMYK Conversions
Re: Adobe PMS-CMYK Conversions
- Subject: Re: Adobe PMS-CMYK Conversions
- From: Sean Magula <email@hidden>
- Date: Wed, 7 Dec 2005 11:56:32 -0800
I have seen this in the past and found out that Photoshop is using the
profile from your 'Color Settings' setup to convert the Lab values of
the PMS color to CMYK, whereas InDesign and Illustrator are using the
values from the Pantone Book.
You can change InDesign and Illustrator to use the Lab values see below.
This is from the Illustrator Help Center
To display and output spot colors using Lab values
Some predefined spot colors, such as colors from the TOYO, PANTONE,
DIC, and HKS libraries, are defined using Lab values. For backward
compatibility with previous versions of Illustrator, colors from these
libraries also include CMYK definitions. The Swatches palette lets you
control which values Illustrator uses to display, export, and print
these spot colors: Lab or CMYK.
Lab values, when used in conjunction with the correct device profiles,
give you the most accurate output across all devices. If color
management is critical to your project, Adobe recommends that you
display, export, and print spot colors using their Lab values.
Note: To improve on-screen accuracy, Illustrator uses the Lab values
automatically if Overprint Preview is on. It also uses Lab values when
printing if you've selected Simulate Overprint in the Output panel of
the Print dialog box.
1. Choose Spot Colors from the Swatches palette menu.
2. Do one of the following:
Select Use Standard Lab Values Specified By The Book Manufacturer if
you want the most accurate display and output of colors.
Select Use CMYK Values From The Manufacturer's Process Book if you
want spot colors to match earlier versions of Illustrator.
For InDesign
1. Choose Ink Manager in the Separations Preview palette menu.
2. Do one of the following:
For Lab values, select Use Standard Lab Values For Spots.
For CMYK values, deselect Use Standard Lab Values For Spots.
In a color managed workflow you will get more accurate PMS colors on
press, I know we have.
On 12/7/05, PID Jmail <email@hidden> wrote:
> Thanks for the info Vic. I asked the pre-press person I'm working with to
> check the Pantone Solid to Process book, but she said that the values in
> there do not (in her experience with their presses) turn out very
> accurately. She is testing the Photoshop conversions on her proofer right
> now. Makes me wonder if I should use a 'Pantone Process' deck for color
> selection instead of 'Pantone Solids' if I rarely use spots in printing? I
> do very little press printing in my job - mostly RGB output from Xerox color
> laser.
>
> Anyway, any ideas on why the three Adobe apps don't convert the PMS spot to
> CMYK process with the same values?
> --
> Aj
>
> > From: Vic Paredes <email@hidden>
> > Reply-To: email@hidden
> > Date: Wed, 7 Dec 2005 11:06:06 -0500
> > To: PID Jmail <email@hidden>
> > Cc: email@hidden
> > Subject: Re: Adobe PMS-CMYK Conversions
> >
> > The most accurate way to do this is to refer to Pantone's Solid to
> > Process book. However, this all depends on whether you want to achieve
> > colour accuracy or perception. Some (most?) spot colours do not
> > convert well to CMYK. The human eye is very subjective so if you're
> > trying to achieve as close a match to a spot colour, your best bet is
> > to create the CMYK values yourself (with a calibrated system of
> > course).
> >
> > Of course, you can still make last minute tweaks on press to achieve
> > what you're aiming for.
> >
> > Hope this helps.
> >
> > On 12/7/05, PID Jmail <email@hidden> wrote:
> >> I¹ve come across a curiousity that I¹m hoping someone can help me with. I¹ve
> >> noticed that if I create a PMS spot color (say 295 Coated) in Illustrator
> >> 10.0.3, InDesign 2.02 and Photoshop 7.0.1 and then convert that spot color
> >> to CMYK process, I get different results quite different...
> >>
> >> for PMS 295C
> >> Illustrator 10.0.3 = 100c 57m 0y 40k
> >> InDesign 2.0.2 = 100c 57m 0y 40k
> >> Photoshop 7.0.1 = 96c 70m 13y 35k
> >>
> >> Illustrator and InDesign always share the same CMYK values of what a PMS
> >> spot should be, but Photoshop is always different. I¹ve heard from pre-press
> >> friends of mine that PMS spot to CMYK process conversions should always be
> >> done in Photoshop because it is the most accurate.
> >>
> >> Does anyone have any info they can share about this?
> >>
> >> One other thing I¹ve noticed is that Photoshop will show a value difference
> >> between coated and uncoated PMS spots, while Illustrator and InDesign do
> >> not. Again, any help/info would be appreciated.
> >>
> >> for PMS 295U
> >> Illustrator 10.0.3 = 100c 57m 0y 40k
> >> InDesign 2.0.2 = 100c 57m 0y 40k
> >> Photoshop 7.0.1 = 84c 63m 22y 14k
> >>
> >> Thanks
> >> --
> >> Aj
> >>
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>
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--
Sean Magula
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