i'm using Ubuntu 9.10.

I have severalo PDFs of old books, in which the pages have turned yellow.

I know how to adjust that yellow in individual pictures.  Is there some way
of adjusting it across a total pdf file?

I could take the files apart (pdftoppm) and do each individual picture, a
pain when the numbers get up to 500+, and I've had trouble getting the pdfs
back, together again.  Besides that, when I do, I lose  the ability to search

Any help would be appreciated.

Jim W. (via www.gimpusers.com)
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