1. A web printing system comprising: a roller configured to rotate with a web moving through a web printing system; an encoder mounted proximate the roller to generate a signal corresponding to an angular velocity of the roller; a first temperature sensor mounted proximate the roller to generate a signal corresponding to a temperature of the roller; a second temperature sensor mounted proximate a position by which the web passes as the web moves through the web printing system to generate a signal corresponding to a temperature of the web; and a controller communicatively coupled to the encoder, the first temperature sensor, and the second temperature sensor, the controller being configured to identify a distance change in a diameter of the roller with reference to a temperature signal received from the first temperature sensor, to identify a change in a parameter of the web with reference to a temperature signal received from the second temperature sensor, and to compute a web velocity for the web moving through the web printing system with reference to the distance change in the diameter of the roller and the change in the web parameter, and the controller also being configured to operate a plurality of printheads to eject ink onto the web at positions corresponding to the computed web velocity.