This article examines the adoption of photography in the surveillance efforts of the French colonial state in Vietnam before World War I. Through the colonial state’s historical documents, prison records, and photographs, the author investigates the role played by photography in relation to new ideas of citizenship and racialization, and argues that photography is a medium of colonialism and modernity, insofar as it is not strictly a Western technology but a consequence of cultural contact and negotiations. Specifically, the article examines the institutional practice of photography in three areas: prisons, immigration, and municipal tax system through three case studies of Poulo Condor, Haiphong, and Hanoi. Together, they build an overarching narrative of how photo identification, despite its limitations, became a standard practice in colonial Vietnam and preceded its widespread application in France in the 1940s. In doing so, this article highlights how colonies were historically treated as laboratories for new scientific endeavors. The author does this in order to argue against a linear narrative of progress that treats Europe as an incubator of innovations in the 20th century.