Thank you
Brilliant answer..
Sent while on the move
Begin forwarded message:
> From: 1T3XT BVBA <i...@1t3xt.info>
> Date: 12 August 2011 08:21:31 GMT+01:00
> To: Post all your questions about iText here
> <itext-questions@lists.sourceforge.net>
> Subject: Re: [iText-questions] PdfConcatenate
> Reply-To: itext-questions@lists.sourceforge.net
>
> On 11/08/2011 21:11, John Renfrew wrote:
>> Just changed my code over to use PdfConcatenate instead of PdfSmartCopy and
>> it's really tightened things up, great improvement
>>
>> Can you tell me what the 'redundant content' smart parameter looks for
>> inside the files??
>
> First some general info: A PDF file consists of a sequence of objects.
> For instance: an image is a "stream" object composed of a "dictionary"
> (key/value pairs) followed by bytes delimited by the words stream/endstream.
> A page is a dictionary with key/value pairs, for instance a key named
> "Contents" referring to the content of the page and a key named
> "Resources" referring to the resources needed for the page.
> If you have two different pages showing the same image (for instance a
> logo that appears in the header), you have to avoid that the bytes of
> this image are stored twice in the same file.
> How is this solved in PDF? The image is referred to in the "Contents" of
> both pages using a name (e.g. /Img1). If you look inside the "Resources"
> of the page, you'll find an entry /Img1 in the "XObjects" resources.
> This /Img1 entry will refer to a stream object containting the image bytes.
>
> Now for your question:
> If you merge a page from one PDF with a page from another PDF, and both
> pages contain the same image (for instance: your company logo), the
> combined result will be a PDF with two pages each containing that image.
> If you use PdfCopy, the image bytes of the same logo will be present
> twice, in two different stream objects. If you use PdfSmartCopy, the
> image bytes will be present once, in one stream object that is
> referenced from different pages. How is this possible? PdfSmartCopy
> takes a hash of every stream object that is encountered and keeps those
> hashes in memory. If PdfSmartCopy detects that you try to add the same
> stream twice, a reference to the first stream will be used instead of
> adding a redundant stream.
>
> This is why:
> - PdfCopy is faster, but you'll possibly end up with bloated files.
> - PdfSmartCopy is slower and more memory-consuming, but you'll end up
> with smaller file sizes.
>
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user administration capabilities and model configuration. Take
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iText(R) is a registered trademark of 1T3XT BVBA.
Many questions posted to this list can (and will) be answered with a reference
to the iText book: http://www.itextpdf.com/book/
Please check the keywords list before you ask for examples:
http://itextpdf.com/themes/keywords.php
