Re: soft proofing of spot colours
Re: soft proofing of spot colours
- Subject: Re: soft proofing of spot colours
- From: Peter Constable <email@hidden>
- Date: Tue, 22 Jan 2008 13:02:25 -0800
- Thread-topic: soft proofing of spot colours
Hi Marco-
I'm happy to report that Photoshop, InDesign, Illustrator, and Acrobat do
allow the characterization of spot library colors using color spaces that
differ from document color spaces.
InDesign Example: Create a doc (Working Spaces from Color Settings are
assigned to the document). In the Swatch palette fly-out list, choose Ink
Manager. In Ink Manager, choose "Use Standard Lab Values for Spots".
Illustrator Example: Create a doc (Working Space from Color Settings is
assigned to the document). In the Swatch palette fly-out list, choose Spot
Colors. In the Spot Colors dialog, choose "Use Lab values specified by the
book manufacturer".
Photoshop Example: Photoshop always uses Lab values for spots, regardless of
the document color space.
For proofing (both hard and soft), the Lab definitions are used to define
the spots. Changing the color space of the document will not alter these
definitions.
_peter
Adobe Systems, Inc.
Marco Ugolini wrote:
>If I understand your question correctly, you are asking whether or not
>applications like Photoshop or InDesign can print spot colors to a
>color-managed printer in an accurate manner. Is that correct?
>
>The short answer is "not exactly", because (a) spot colors are properly
>defined in L*a*b* -- not RGB or CMYK. Currently I don't believe that there
>is an option in Adobe apps to use split print paths, one for the source
>colors (RGB or CMYK) *and* one for L*a*b*-defined spot colors; and (b) often
>enough several spot colors live outside the gamut of the output device
>anyway.
>
> In other words, all that the Adobe apps can do reliably is to use the target
> profile and convert all of the source colors to it. But the source colors
> can only be in *one* single color space.
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