While media images can ease political information perception and processing, the impact of images on behavioral intentions to engage in protest is relatively unexplored. We ask: Under what conditions can news images of protest “move” people and affect the willingness to participate? Aiming to answer this question from an information-processing perspective, we shed light on the nexus between spontaneous, sensory behavior and cognition in response to news media images of protest. We conducted a multigroup experiment in which 143 recipients were randomly exposed to four news images of protest and their visual attention monitored. Multilevel regressions indicate that viewers fixate on images of protest prior to accompanying texts. When exposed to protest images with a negative valence, an increase in the observation duration for protest images increases the recipient’s willingness to participate. Contrariwise, when viewing protest images with a positive valence, a longer observation duration does not increase participatory intentions. Irrespective of image valence, the greater the salience that viewers subjectively ascribed to the image, the greater their willingness to protest concerning the depicted issue. Our analysis also reveals a cross-level interaction effect indicating that the impact of image observation duration on the willingness to engage is conditional on individual levels of political interest: The positive effect of observing protest images on the willingness to protest is especially increased, if an individual is highly politically interested. These results indicate that, under certain conditions, media images are efficient carriers of political content that can motivate citizens to protest.