Re: PDF transparency

You're confusing issues. Adobe PDF is transparency friendly and has been
since Acrobat 5. That is irrefutable. Look it up in the PDF specification.
Transparency doesn't exist in the physical world. So to be printed it has to
be flattened. That fact is irrefutable too. The print providers have to deal
with transparency in one of three ways:

1) Reject it
2) flatten it in an application like Acrobat, Illustrator, InDesign or
PhotoShop, Quark or by printing. As in "file menu -> Print".
3) Flatten it in the RIP by sending the RIP a PDF.

You can't send a RIP a file with transparency by using PostScript because
transparency doesn't exist in PostScript. In order to do so you have to
flatten the transparency. Which brings us back to option 2.

Why are there different results? Because the process of flattening can be
handled differently by changing parameters, there are different blending
modes and different color spaces for the blending. No one knows how
Publisher does it. But you can direct the Adobe applications and the Adobe
Print Engine to handle transparency in different ways. Most RIP's now
internally convert a PDF to PostScript. Not many of them handle PDF
directly, on the Harlequin based RIPs *can*. Not all do.

If you are using transparency for web work then you've overcome the problem
of physics. Because it's all math at that point. Pigmented inks are physical
and used in printing. Transparency simply doesn't exist in the printing
world except as a mathematical process.

Matt Beals
Consultant
Enfocus Certified Trainer
Markzware Recognized Trainer
(206) 201-2320 - Main
(720) 367-3869 - eFax
mailto:matt@xxxxxxxxxxxxx

Come visit me at:

http://www.automatetheworkflow.com
http://www.mattbeals.com
http://blog.mattbeals.com

Friends don't let friends write HTML email

On 4/19/07 9:16 AM, in article
9486C6D5-C9FD-4D84-9B88-5561476FE3E9@xxxxxxxxxxxxx, "Jan Kucera"
<miloush@xxxxxxxxxxxxxxxx> wrote:

Hi Matt again, I was thinking about this a while, and I don't think you're
right. Either PDF is absolutely transparency non-friendly, or there is
nothing to handle. If I have transparent image and it has to be flattened,
than the PDF is not transparenty friendly. If it hasn't to be flattened, why
there are different results when displaying transparent images?

Jan


"Matt Beals" <matt@xxxxxxxxxxxxx> wrote in message
news:C245CC68.60E78%matt@xxxxxxxxxxxxxxxx
Huh?? Adobe handles transparency better than anyone else. PDF is *very*
transparency friendly. It is the flattening of transparency where you run
into differences. Even then, Adobe is best at it.

Matt Beals
Consultant
Enfocus Certified Trainer
Markzware Recognized Trainer
(206) 201-2320 - Main
(720) 367-3869 - eFax
mailto:matt@xxxxxxxxxxxxx

Come visit me at:

http://www.automatetheworkflow.com
http://www.mattbeals.com
http://blog.mattbeals.com

Friends don't let friends write HTML email


On 4/13/07 10:55 PM, in article
6D45B19A-7268-48E4-82BB-C482079AB3DE@xxxxxxxxxxxxx, "Jan Kucera"
<miloush@xxxxxxxxxxxxxxxx> wrote:

Hi, is there any way to tell Publisher (2007) to render transparent
graphics
to PDF better? I know PDF itself is not transparent-friendly, but if I
use
Adobe products, there seems to be no such problems (black contures around
the images).

Thanks, Jan




.

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