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Old 29. Aug 2015, 12:06 PM   #9 (permalink)
Senior Member
Join Date: Feb 2009
Location: Wales, UK
Posts: 1,174


For anyone interested, here's how I did it....

1. Export PDF to BMP using PDF-XChange Editor.

2. Open BMP in PhotoFiltre and use the "replace color" tool to select offending blue pixels and replace them with white.

The replace color tool took a bit of finding and playing about with but it simplified the task enormously.
Basically the process was.....

> zoom in to 500%
> selection menu > select all
> adjust menu > replace color
> use color picker to select colored pixels (blue in my case) to be replaced
> adjust tolerance level to achieve maximum desired effect being careful to avoid inclusion of original text pixels
> replace selected pixels with white (in my case)
> repeat color selection for remaining blue pixels that were out of tolerance range of initial selection
> again replace these remaining selected pixels with white
> repeat until no blue pixels remain

3. Save the edited BMP and print to PDF using doPDF 8

et voila!

For me, PhotoFiltre's "replace color" tool was easier and more efficient than using GIMP's combination of select color and color fill tools.

Thanks for the input everyone.

Last edited by Sope; 29. Aug 2015 at 12:23 PM. Reason: added detail
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