1. You didn't read the 'rules'. See http://lowagie.com/rule1
The rule you broke: you are not registered on the mailing list.
You may think you are, but you're not, see http://lowagie.com/nabble

2. As for your question:

Op 15/10/2012 16:36, ericoce schreef:
> Dear Support:
>         I use  to IText to  do  the  pdf  imposing , like use 2 pdf pages
> into  a  new one pdf page, and usually
> i found  new pdf size i created is much  smaller  the original PDF,  like
> the original file is 2MB  but after  operate,  the new pdf is no more than
> 1MB , i want to now why the new file is much smaller than original
> file ?  does  the  itext  down the pdf quality?(this is very import for me
> ,because the new file i created i will
> print it on color printer,usually the pdf  files the customer use  is  high
> quality full color pdf files, if the pdf quality is bad after using Itext,
> of course the printing quality is bad)

A smaller size of a PDF can be a bad thing, but it also can be a good thing.

A bad thing: maybe you're using PdfWriter/PdfImportedPage instead of 
PdfStamper. In that case you may be throwing away all interactivity, all 
structured information (if any), and so on.

A good thing: maybe you're throwing away unused objects, maybe iText is 
optimizing the PDF by reusing objects that otherwise would be present 
redundantly.

Read http://www.manning.com/lowagie2/samplechapter6.pdf for more info.

Note that iText doesn't downgrade PDFs on purpose. If a PDF is 
downgraded, it's because of wrong use of iText. As you don't tell us how 
you're using iText, we can't tell you if you're doing it right or not.

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