Why using Acrobat 10 resaving a PDF file that was 4MB will become 3MB?

Posted by Jian Lin on Super User See other posts from Super User or by Jian Lin
Published on 2011-03-19T07:45:24Z Indexed on 2011/03/19 8:12 UTC
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I had some PDF files and just try to open it and do some highlighting using Acrobat 10 (also called Adode Reader X)...

After highlighting, I save the file (using a different filename), and now the file change from 4MB to 3MB... is it just compression? Or making the images have lower clarity? (thought I cannot see any difference). What is the reason? If it is just compression, then why wasn't it done before, as winzip technology is quite mature more than even 10, 12 year ago.

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