Modifying PDF contrast with Inkscape

 I had to submit a form to my school to verify my enrollment to another person. In order to do so, I had to scan the form first and then email it. But rather than use my printer's scanner, I decided to use my phone to scan the document as it was faster. Unfortunately the contrast of the pdf was not the best. I tried adjusting it by changing it to "Greyscale" or "Black and White" after I had scanned it on my phone through the notes app, but it still was not good enough. 

Because I've been using Inkscape, I wondered whether I could use it to change the contrast of the pdf. After importing it, I used the "Filters" tab, and after some searching, I found that "Greyscale..." under the "Color" option would achieve what I wanted. I found that by using "Lightness", I could change the contrast of the page. I will probably use this again as I don't have a subscription with Adobe Acrobat Reader to edit my PDF files. But I might not in case my phone is able to achieve the proper contrast on the first few attempts.

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