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Love GIMP. Always capable of doing anything I need done with raster images or even PDFs. Lately I've been opening PDFs and lightening the pages so that they can be printed without wasting a bunch of toner on backgrounds that are meant to be white but were scanned in as a light grey.

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I assume you don’t do this manually and you’re doing some kind of scripting, can you describe your process?

Sorry, I don't have to do it in sufficient quantity of frequency to encourage scripting. And while doing it manually, I notice that the required tweaking of levels changes depending on the content of the page and how poor the scan is. I'm not sure an automated solution would provide satisfactory results consistently.

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