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From: AES on 28 May 2010 09:58
steggy <steggy(a)hotmail.com> writes:

> > Not sure what "Layers" can be in PDF.

And Michael Vilain <vilain(a)NOspamcop.net> writes:

> In regular PDF files, they don't exist as does the OP's expectation
> about PDF files. Don't think he's gonna get anywhere with this one, but
> maybe he has John Warnock's ear. You never know.

And this OP goes to the 505 page users' guide on his HD -- the one that
Adobe supplied at the time he purchased his copy of Adobe Acrobat
Standard 7.0, and that can also be downloaded from Adobe's web site --
and copies and pastes the following:

About Adobe PDF layers (boldface title line)

Acrobat supports the display, navigation, and printing of layered
Adobe PDF content output by applications such as Adobe InDesign,
AutoCAD, and Visio.

You can rename and merge layers, change the properties of layers,
and add actions to layers. You can also lock layers to prevent them
from being hidden.

To create layers while exporting InDesign CS or later documents to
PDF, make sure that Compatibility is set to Acrobat 6 (PDF 1.5) and
that Create Acrobat Layers is selected in the Export PDF dialog box.

and shortly thereafter

Viewing layers (another boldface title line)

Information can be stored on different layers of an Adobe PDF
document. The layers that appear in the PDF document are based
on the layers created in the original application. You can examine
the layers and show or hide the content associated with each layer
by using the Layers tab in the Navigation pane. For more information
on working with layers, see About Adobe PDF layers.

Don't have Warnock's ear; do at least attempt to know what I'm talking
about before posting; and do definitely know how to use "Kill" files.
From: steggy on 28 May 2010 18:13
Michael Vilain schreef:
> In article
> <siegman-35B6F3.06584928052010(a)bmedcfsc-srv02.tufts.ad.tufts.edu>,
> AES <siegman(a)stanford.edu> wrote:
>
>> steggy <steggy(a)hotmail.com> writes:
>>
>>>> Not sure what "Layers" can be in PDF.
>> And Michael Vilain <vilain(a)NOspamcop.net> writes:
>>
>>> In regular PDF files, they don't exist as does the OP's expectation
>>> about PDF files. Don't think he's gonna get anywhere with this one, but
>>> maybe he has John Warnock's ear. You never know.
>> And this OP goes to the 505 page users' guide on his HD -- the one that
>> Adobe supplied at the time he purchased his copy of Adobe Acrobat
>> Standard 7.0, and that can also be downloaded from Adobe's web site --
>> and copies and pastes the following:
>>
>> About Adobe PDF layers (boldface title line)
>>
>> Acrobat supports the display, navigation, and printing of layered
>> Adobe PDF content output by applications such as Adobe InDesign,
>> AutoCAD, and Visio.
>>
>> You can rename and merge layers, change the properties of layers,
>> and add actions to layers. You can also lock layers to prevent them
>> from being hidden.
>>
>> To create layers while exporting InDesign CS or later documents to
>> PDF, make sure that Compatibility is set to Acrobat 6 (PDF 1.5) and
>> that Create Acrobat Layers is selected in the Export PDF dialog box.
>>
>> and shortly thereafter
>>
>> Viewing layers (another boldface title line)
>>
>> Information can be stored on different layers of an Adobe PDF
>> document. The layers that appear in the PDF document are based
>> on the layers created in the original application. You can examine
>> the layers and show or hide the content associated with each layer
>> by using the Layers tab in the Navigation pane. For more information
>> on working with layers, see About Adobe PDF layers.
>>
>> Don't have Warnock's ear; do at least attempt to know what I'm talking
>> about before posting; and do definitely know how to use "Kill" files.
>
> This is a function of the program reading the PDF file. If Preview or
> Adobe Reader don't allow you to select and navigate objects created in
> PDF files, contact the vendor of those programs.
>
> Reader ==> John Warnock
> Preview ==> Steve Jobs
>
> I've seen Photoshop actively use the objects you talk about. But not
> any other program. Pages doesn't seem to support reading PDF files only
> outputing to PDF. Intaglio can read PDF files but the file is seen as a
> single page graphic with no objects. Didn't investigate other
> applications. I leave that up to you.
>
> If you can write perl, you could cobble a GUI program with Perl/Tk and
> various CPAN PDF modules to do this sort of thing. If it's that
> important to you, I think you'll have to.
>
> Good luck with that.
>


But Illustrator is great in changing PDF-files.
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