The official guidelines do not mention that in specific. So either of them is fine. According to the official guidelines, the photograph needs to be of maximum 80 kb size and either in JPEG/JPG format. If you think your handwriting might be misunderstood, to leave no chance for any rejection of the application, it is better to get it digitally printed. In fact that is a good idea because the servers can easily read it. If you want any further information, please visit our page at: https://medicine.careers360.com/exams/neet-pg