This paper investigates and describes the method of digitizing photos. In the theoretical part of the work, the digitization process itself is defined. It also describes the aim and purpose of digitization, as well as the advantages and disadvantages of the digitization process. This paper will also analyze how digitization affects the access and use of photographs and how important it is to carry out this procedure in order to preserve valuable photographs for future generations. Furthermore, this paper aims to help readers understand the process of photo digitization, how it is carried out, and what are the advantages and disadvantages of this process. This paper will provide an overview of the application of photo digitization in a library environment and provide examples of good practice in photo digitization. The first part of the research of this paper provides an overview of the comparison of photo collections in libraries: Osijek City and University Library, Marko Marulić Split City Library and Zagreb City Library, and in the second part of the research an interview is conducted to find out what are the criteria for selecting photos for digitization used by the Scientific Zadar Library and how the Zadar Science Library carries out the process of digitizing photos. The research was conducted using a semistructured interview with the director of the Zadar Science Library.