Re: Acrobat 8 Color questions
Re: Acrobat 8 Color questions
- Subject: Re: Acrobat 8 Color questions
- From: Olaf Drümmer <email@hidden>
- Date: Tue, 26 Jun 2007 00:40:26 +0200
Hi,
I just posted this to a similar thread on the Adobe forum:
Hold on for a second...
In a PDF file the rendering intent is always defined in the PDF. If
it is not explicitly defined it defaults to Relative Colorimetric.
The rendering intent can be set individually for each page object.
A rendering intent obviously will only kick in if a color
conversion is being performed.
As far as I can see one of the main reasons for not offering
something in the user interface of Acrobat to change rendering
intent was (sic!) that it's not the whole PDF that has one
rendering intent (and even not that all the images have one, and
the vector stuff has something else) - as each and every single
object could have it's own rendering intent a decent user interface
would be needed that allows a user to inspect each and every object
- and to adjust the rendering for each and every object
individually. Now, PDF was never intended to be a format for
editing...
That much said - in Acrobat 8 Professional's Preflight you do have
a fixup called "Set rendering intent" - and it just does what it
says, and on top of that, it gives you pretty flexible options at
how to change the rendering intent for what types of objects.
So if anybody really is into juggling with rendering intents in a
PDF file - it now can be done. Just check out Preflight in Acrobat
8...
Olaf Drümmer
callas software (the company who developed Preflight ;-> )
HTH
Olaf
On 25.06.2007, at 22:31, Roger Breton wrote:
In Acrobat 8's Color Settings why is there no place to set a
rendering intent? Is there no way to specify a rendering intent for
the conversion of a document? What rendering intent gets used and how
is that determined?
I sympathize with your frustration, Rich.
I can only offer some of my own insights, here.
The way it was explained to me is this, Acrobat has no inrerface
for setting
rendering intents because they are set at the object level.
The only RI interface I know of is in the Color Management pane of the
Preferences. But this is probably not what you are looking for.
AFAIK, this
RI only affect the "Output Intent", similar to PDF/X-1a.
The most frustrating is that Adobe has not deemed important to make
any
changes or improvement in Acrobat 8 color management, compared to v7.
Also, could someone set me straight on "Device" colors and
"Calibrated" colors, please?
"Device" means "device dependent" (RGB, CMYK, Gray) whereas
"Calibrated"
means it has some sort of "profiles" associated to the objects like
CalRGB,
which is a kind of ColormatchRGB or idealized display profile.
From the help menu I'm getting that
"Device" colors refer to untagged elements, and "Calibrated" refers
to elements tagged with device-independent profiles.
Makes sense.
So, "Calibrated
CMYK" should be an impossibility, right?
Beats me, Rich. I haven't given too much thought to this one.
So, would elements tagged
with device-dependent profiles fall into a third category that
doesn't get displayed in the Convert Colors dialog?
I don't think there as such things as "device-dependent" profiles
in PDF.
Device is just that, raw, uncalibrated data. And, I would suspect that
Device falls under the Output Intent. But that's pure speculation
on my
part.
Rich Apollo
Roger Breton
--
Olaf Druemmer | Managing Director
callas software GmbH | Schoenhauser Allee 6/7 | 10119 Berlin | Germany
Tel +49.30.4439031-0 | Fax +49.30.4416402
Amtsgericht Charlottenburg, HRB 59615 | Geschäftsführung: Olaf
Drümmer, Ulrich Frotscher
email@hidden | www.callassoftware.com
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