1. A system for processing a financial document, comprising: an interface configured to receive an image of the financial document from a computing device of a user having an account at a financial institution; an image processor configured to receive the image and overlay a reference mark on a copy of the image; a histogram generator configured to generate a histogram of the copy of the image having the reference mark; a brightness corrector configured to determine an amount of brightness to add to each pixel of the image based on the histogram of the copy of the image, and add the amount of brightness to each pixel of the image in order to generate a brightness corrected image; and wherein the image processor is further configured to obtain financial information pertaining to the financial document from the brightness corrected image.