Re: (no subject) (cross simulation)
Re: (no subject) (cross simulation)
- Subject: Re: (no subject) (cross simulation)
- From: Thomas Holm / Pixl <email@hidden>
- Date: Sun, 27 Jul 2003 10:05:51 +0200
David Harradine wrote:
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I'm wondering what is the
>
best way to generate an accurate CMYK proof on this system ?
>
>
I realize my 1290 prints include light cyan and magenta which is beyond the
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CMYK gamut and would like to confirm the following.
Light Cyan and Magenta doesn't increase the gamut, but makes for smoother
dots/gradations in the highlights.
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>
Will converting my RGB file to my CMYK profile and then converting back to
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my 1290 profile give me the best CMYK proof from this device or is there a
>
better way ?
If you want to make an accurate simulation of your CMYK press (cmyk press
profile), you need to convert first from RGB to CMYK using whatever
rendering intent you prefer, and then from CMYK to your 1290 RGB profile
using relative colorimetric, or Absolute colorimetric. AbsCol will simulate
the paper color of the paper used to generate the CMYK profile, so only use
this if it's a profile made on the actual press, and for the actual paper to
be used in the press run. If it's a generic CMYK profile stick with RelCol.
The easy way to do this from Photoshop is set up your preferred CMYK profile
and rendering intent in the View > Proof Setup > Custom. Then when you have
the RGB image open and select Print with Preview, in the More Options pop-up
(PS7) you can select your printer profile under "Print Space". "Source
Space" should simply be set to "Proof" as opposed to "Document". This will
make Photoshop convert your RGB file to CMYK using the settings you selected
in the Proof Setup dialogue, and then to Printer RGB using the options
(intent) you select in the print dialogue. Black Point Compensation should
be off in the print dialogue.
It would be a good idea to compare the gamut (color range) of your 1290 with
the gamut of your CMYK profile to ensure that most colors of your CMYK space
can actually be reproduced on your 1290. ColorThink from www.chromix.com is
perfect for that purpose. You will find that your choice of paper will have
a large bearing on how large a gamut your printer has (how many color's it
can reproduce).
>
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Also should I have profiled my 1290 as an RGB or CMYK device to get the best
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CMYK proofing results ?
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I am not using a RIP !
When you don't have a RIP it has to be RGB as the printerdriver is QuickDraw
or GDI (which is RGB).
Best Regards
Thomas Holm / Pixl ApS
- Photographer & Colour Management Consultant
- Adobe Certified Training Provider in Photoshop.
- Imacon Authorized Scanner Training Facility
- Remote Profiling Service (Output ICC profiles)
- Seminars speaker and tutor on CM and Digital Imaging etc.
- Home Page: www.pixl.dk 7 Email: th[AT]pixl.dk
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