How do you darken writing in a picture of a old letter?

I took a picture of a letter my dad wrote while he was in Vietnam. You can barley make out the words in the letter. I was wondering how I can darken the words on the photo of the letter from my phone. All I have is the photo I took of the letter. I know there has to be a app or something to be able to darken just the words.
Rissaroo37
Asked Mar 08, 2016
adobe Photoshop or something similar to it would be best.
luka7591
Answered Mar 09, 2016

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