Re: Of a wish for Pshop 7 / new: rgb versus cmyk
Re: Of a wish for Pshop 7 / new: rgb versus cmyk
- Subject: Re: Of a wish for Pshop 7 / new: rgb versus cmyk
- From: Josef Fallnhauser <email@hidden>
- Date: Sun, 01 Jul 2001 12:46:11 +0200
Henrik Holmegaard wrote:
>
Users should learn never ever to work without enabling View > Proof
>
Setup > Custom > Simulate Ink Black. This both enables the source RGB
>
working space to simulation CMYK to destination monitor RGB
>
transform, but also matches the ink black absolutely to the deeper
>
black range of the monitor, lightening what should be light.
If I do so, the preview looks terrible - all over a white cast. I can't
believe that this is your opinion of how a preview should look like. Also
the print wouldn't look like this white soup.
But I would like to start an other discussion about rgb versus cmyk
workflow. What I learned in the very early beginning of my interest in CMS
was, that when you convert from rgb to cmyk you always use a perceptual
rendering intend (setting a bigger color space to a smaller one). But this
is only correct when the colors of your picture fill out the hole rgb
working space. A lot of pictures do not and so this pictures - converted
with a perceptual rendering intent comes out flat (all over a little bit
gray). With such pictures it would be much better to use the relative
rendering intent. That also means, that e.g. in InDesign, were you have the
possibility to set a rendering intent for pictures and plain colors
separately, it never will work satisfaction. It never will work to automize
the conversion from rgb to cmyk. And also by the visual control of how you
set the rendering intent, there will be some more corrections necessary to
get a really good cmyk-file. I think that this is also a reason, why a lot
of litho studios don't leave there experienced way of a cmyk workflow were
they control the picture from the beginning of how it shall came out in a
fixed cmyk space. Once I tested myself a picture - scanning and work at in
rgb, and also scanning and work at in cmyk. The rgb I converted to the same
(with the same) cmyk profile I did the cmyk scan, the result was not as good
as the cmyk work. (the results were printed on an Iris 2Print)
I think that there are still to many unstable factors in CMS that it would
be acceptable for a bigger range of users.
Josef Fallnhauser
---------------------------------
Josef Fallnhauser (c/o Studio Trizeps)
Zollergasse 13/9
A-1070 Wien / Austria
Tel: (+43-1) 5263393 Fax: (+43-1) 5266020
www.trizeps.com
mailto:email@hidden