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Old 29. Aug 2015, 10:26 AM   #6 (permalink)
Senior Member
Join Date: Feb 2009
Location: Wales, UK
Posts: 1,174

Thanks guys.

I believe using the eraser tool in most of these programs is a manual process which I was hoping to avoid resorting to as the amount of pen marks, and how close they are to the original text is going to make it a painstaking job!
I did start the process in PDF-XChange Editor using a high zoom and the pencil tool set to white, and that's what got me hoping for an automated alternative method!

I've had a play with GIMPPortable and found the "select color" tool, although as Joe mentions, the varying shades of blue are an issue. GIMP does have a threshold/tolerance slider but it's not an easy thing to get right, and I made a bit of a mess with that.

I'll have a look at PhotoFiltre and see if that's any more user friendly. (Good to hear there's a portable version).

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