1. A computer-implemented method for displaying a page image based on a determined legibility of text in the page image, the method comprising: (a) obtaining an image of a page at a base resolution; (b) obtaining a measure of the page image height at the base resolution; (c) performing text recognition on text in the page image to obtain a measure of text height of the text of the page image at the base resolution; (d) dividing the text height by the page image height to produce a text-to-page height ratio; and (e) obtaining a new image of the page at a resolution higher than the base resolution when the text-to-page height ratio is below a threshold that indicates legibility.