1. A method to compare images, the method comprising: adjusting a color histogram associated with an input image based on a first reference color histogram associated with a first reference image to determine a first adjusted color histogram associated with the input image; comparing the first adjusted color histogram and the first reference color histogram to determine whether the first reference image matches the input image; and displaying a version of the first reference image adjacent to a display of the input image in response to determining that the first reference image matches the input image.