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Old 10. Mar 2014, 03:37 AM   #1 (permalink)
Join Date: Mar 2014
Posts: 1
Default need help with PDF

i have a textbook scanned as images and saved as a PDF file.
how can i "highlight" and add my own notes to the images??
they're not texts, so the usual highlighting doesn't work, and the pop-up note is too small to see on the image :/
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