1. A method for aligning at least two flexographic printing plates on at least one printing cylinder, comprising the steps of: capturing an image relating to a first plate; capturing an image relating to a portion of a second plate; reprocessing the image captured from the first plate so as to obtain a portion thereof corresponding to the image captured from the second plate; concurrently viewing said reprocessed image and the image captured from the second plate; and moving at least the second plate by bringing the image captured from said second plate next to said reprocessed image in composition, wherein, given a value of the zoom factor of an image capturing device having a definition expressed in pixels/mm, the image captured from the first printing plate is obtained by calculating the spatial dimensions of the image that can be framed by said capturing device, capturing a plurality of images at spatial intervals equal to the distance between said images and collimating the images captured with one another.