Re: Adobe Acrobat versions
Re: Adobe Acrobat versions
- Subject: Re: Adobe Acrobat versions
- From: <email@hidden>
- Date: Wed, 24 Nov 2004 13:34:50 -0500
Roger,
Following your response,
Like I said, I gather that Word treats all color as sRGB
but doesn't pass
this information on to the print driver at the time of
generating the
PostScript on the way to Distiller, if Distiller can be
found on the host.
PDF Writer is even more simplistic. In the end, I
believe everything ends up
in CalRGB which is close to ColorMatch RGB in terms of
specs, last time I looked at it.
I made a small test placing identical TIF images, one with
an embedded Adobe (1998) profile, and the second one
without a profile, in a Word doc. The two images were
encoded in Adobe (1998) RGB.(test done in Windows)
The image with the profile got converted to sRGB once
placed in Word, the other obviously stayed the same. When
transformed in a pdf with Color Mgmt options "ON", the
attached profile for both images is sRGB.(this was the
defaut working space defined in Distiller).
With the same file, I then assigned Adobe (1998) as the
working space and now everything is managed as being Adobe
(1998). The first image, the one which has an Adobe
profile, is now too saturated (not surprising since it was
twice converted), and the second one, which had no profile
but which was also based on Adobe (1998) RGB data, is now
properly shown (which proves that Word can output pdf in
another space, with help from Distiller).
My partial conclusion (Note: I may have used different
version than the ones you had when you made your tests):
Word + Distiller support other color spaces as long as you
do not mix spaces and you do not mix tagged and untagged
images. As you said, Word treats everything as sRGB (even
transforming files when they have a profile). It is up to
Distiller to place things in the right perspective. (more
analysis required here as there are many options to get to
the same results)
As for CMYK separation, you mentioned PitStop could do it.
Are there other ways to do that (Acrobat 7 ?) ?
Is it required to go CMYK if you go from PDF to DocuColor?
Danny
On Wed, 24 Nov 2004 11:00:49 -0500
Roger Breton <email@hidden> wrote:
I suspect the "trouble" you are referring to relates to
obtaining accurate color control. If this is the case,
could you elaborate on the typical problems I could face
using Word documents as the source. I am familiar with
the
B&W-MS_Word-pdf workflow, having gone through the
process
of publishing books with hundreds of B&W illustrations
done on a DocuTech, but I am less familiar with the
Color-MS_Word-pdf type of results.
Danny
www.BabelColor.com
The biggest trouble I'm aware of, I could be wrong, is
the fact that all
objects are considered as RGB color, even black text. So
that's a problem
for folks who don't have a PitStop type of PDF Plug-in
to accurately convert
the RGB objects to CMYK. And there's also the problem of
placed images in
Word. How can those ever be color-managed? I believe if
one makes the
assumption that all colors in Word and indeed Office is
sRGB then it should
all make sense. But I have not gone further than that,
myslef, because I
don't have a requirement to use Word in my work.
Like I said, I gather that Word treats all color as sRGB
but doesn't pass
this information on to the print driver at the time of
generating the
PostScript on the way to Distiller, if Distiller can be
found on the host.
PDF Writer is even more simplistic. In the end, I
believe everything ends up
in CalRGB which is close to ColorMatch RGB in terms of
specs, last time I
looked at it.
Regards,
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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