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Topic: Re: Couple of douts in PDF Spec
Conf: (P-PDF) Developers, Msg: 56759
From: LeonardR
Date: 5/29/2002 05:21 PM

At 9:40 AM -0500 1/9/01, p-pdf-developer Listmanager wrote:
>I have a couple of doubts regarding the PDF spec.
>1) In a multi-page PDF doc, how text/images or simply page content
>in successive pages can be selected. I want to select the text from
>say page x and alongwith the one in page x+1.

As Aandi points out, text selection is a UI feature of the
PDF viewer (Acrobat, Xpdf, GhostView, etc.), not of PDF itself. How
you would implement that in your own application is up to you.

If you are talking about doing this as a plug-in for Acrobat,
then I believe there is a set of API's for doing that.

>2) In PDF Reference spec, the example given in LZWdecode seems to
>be wrong. I am doing study in LZW algo and if I see the example in
>that book, i doubt how it is done. In that example last byte 66
>cannot be decoded at all, according to my opinion. But am I right
>or wrong?
I'll second Aandi's opinion on this one - forget about LZW
support since you have to worry about licensing from Unisys and they
are pretty "icky" about it depending on your needs.

Leonard Rosenthol
Sr. Software Engineer (215) 922-3509 (voice)
Digital Applications (215) 440-0504 (fax)

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