Every semester of my son's test week, I need to scan all his past worksheets into PDF files and find a way to delete all the answers that he wrote so he could redo them as his revision.
Normally I would scan them into PDF's, convert them to jpg and edit out the answers on a photo editing software. You can imagine thats extremely tedious.
Is there a better solution to this? I have tried PDF editing softwares but every one that I've tried could not cut out/delete sections of the page without going into OCR and making lots of distortions to the layout/text and rendering the file useless.
I have tried to insert the jpgs into Word and putting lots of white rectangles over the answers to cover them. This is a quick way to achieve what I want but the print-out would end up zoomed out, due to the margins that Word has. If I max out the margins (making them all zero), somehow I could not overlay the white rectangles on top of the jpg files without messing up the alignment.
Would desktop publishing software be a good idea? I have tried Scribus and it doesn't seem to help at all.