Re: dcs files and QuarkRGB
Re: dcs files and QuarkRGB
- Subject: Re: dcs files and QuarkRGB
- From: Joel <email@hidden>
- Date: Wed, 17 Jan 2001 12:26:48 -0600
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David wrote:
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I am using the Print RGB extension for Quark 4.04 and things are working fine
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for me with CMYK and RGB imports. What you stated above is incorrect
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according to the supplied PDF. The PDF file states that PrintRGB will output
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RGB Tiffs without converting them and will not effect CMYK files. This part
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of my workflow is working fine for me since I control all color conversions
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with my output software, Onyx Postershop.
You are quite correct that I am incorrect but I guess it's all a
workflow thing... I use Quark CMS for proofing on any of three
different devices before output to our PantherRIP (one of which is a
Zerox 5790 w/SplashRIP {gag!}). It is recommended that you do not use
PrintRGB in conjuction with the Quark CMS QuarkXTensions software as
the results will be unpredictable (and they are). I am constantly in
and out of CMS. Forgetting to remove/restart when going to film is a
costly mistake.
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If I choose CMYK composite in Quark 4.1 when postscripting does this then
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convert my RGB files - I prefer it not - and if I choose RGB composite what
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does Quark do with the CMYK tiffs, convert them to RGB? Quark CMS is turned
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off.
Yes and yes, respectively.
CMYK comp renders CMYK data throughout the document. It is a
prepress/press necessity. RGB comp renders RGB throughout. This is a
RGB workflow necessity.
My understanding is the PrintRGB composite feature in 4.1 is to
workaround the removal/reboot demands of PrintRGB extension and iron
out mixed color files into a common space. It does convert all
objects (with the exception of EPS files) through the Quark default
RGBtoRGB table value or the CM'd space of your choosing. Whether or
not you choose to output using CMS is up to you and the
quality/accuracy of your profiles.
FYI:
http://www.quark.com/support/articles.cfm?idx=3682
Question:
What are the differences in the way the different versions of
QuarkXPress print RGB information in a document?
Answer
Note: EPS files are not affected by any choices made in any
version of QuarkXPress listed below.
QuarkXPress 4.0x
When QuarkXPress 4.0 through 4.04 detected RGB information,
they automatically converted all RGB color information to CMYK
when printing separations. This was true for all images and all
QuarkXPress elements. This caused problems for those who
printed to an RGB device such as a film recorder.
QuarkXPress 4.0x with the Print RGB XT Loaded
With the Print RGB XT loaded, QuarkXPress 4.0x deactivates the
process of converting RGB images to CMYK. It does not, however,
affect QuarkXPress elements defined with RGB colors. These are
process separated by default just as would occur without the
XTension loaded.
QuarkXPress 4.1
In version 4.1, routines are included in the print engine (the part
of the application that generates PostScript) that allow the user
to print either within an RGB or a CMYK color space. The control
for this setting is located in the Print dialog: Print Dialog>Output
Tab>Print Color.
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My original post concerned what to do with DCS files that contain a spot
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plate and how to handle them when printing composite postscript rather then
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separations.
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I wrote;
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> The best way I've found for handling these files is to do profile to
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> profile conversion from CMYK to RGB with a relative intent. I then merge
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> the spot plate back into the other channels and save my file now as RGB
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>> Are they other ways of dealing with this? Is there perhaps some
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>> extension for Quark that will allow me to postscript a composite file
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>> with the 5th plate...
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>>
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I did test a DCS file with a 5th plate in Quark 4.1 but got the same results,
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the image dropped out when treated as a composite postscript.
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Is my above method of merging the spot color my best solution?
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I use Photoshop dcs 2.0 Multiple files with color composite. The Comp
is a an EPS file w/tiff preview and is the one used by Quark when
printing composites. In Quark, with Maintain OPI Links on, I print
RGB composite to the PPD for the intended color output device. Note:
when I open that same postscript (.ps) file in Photoshop the spot
values equal my original in cmyk, rgb and lab values (this is due to
the nature of eps postscript). If this differs from what you get then
I would wonder.
Hope this helps.
Incidentally, what comp printer are you using?
--
joel johnstone
designtype
Winnipeg Manitoba Canada
email: work: email@hidden
color geek in residence, reality notwithstanding