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Topic: Does anybody make a contrast tool for pdf?
Conf: (P-PDF) Developers, Msg: 125257
From: Smarty
Date: 1/11/2005 12:54 PM

Firstly sorry if I posted this to the wrong section, I'm a noob here :)

Here is my problem along with a known solution (but not for PDF) maybe some of you guys know a better way?

I have a collection of eBooks that have been scanned from the original books, the main problem with these is that the pages appear on off yellow color and also the print is visible from the reverse side of the page as a very faint inverted ghost image (I'm sure you've seen the affect plenty of times)

I have tried dozens of different ways to restore these books and get rid of the ghost images but unfortunately most of the things I tried actually started to enhance and preserve the ghost images, I did however find a way that works brilliantly using graphic software but can't find the equivalent for PDF.

For pages that were just black ink on white paper I found that using graphic software you can reduce the contrast by 10% to 15% and suddenly the off white pages become a brilliant white, the ghost images completely disappear, the black text is enhanced, and since the file is no longer storing the ghost image the file size is dramatically reduced.

I have yet to find a way that works as well on pages that use color print but I'm still busy tinkering with different ideas.

So does anybody know of any PDF tools that can help me restore these eBooks?

Thanks :)

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