A Passport Photo has certain quality requirements, set forth by the various governments around the world. Contrary to popular belief in the states, the entire planet does not use the Imperial Measurement System (miles, yards, feet, inches). In fact, the only countries still using that system are the US, Burma, and Liberia. The rest of the planet is on the Metric System (kilometers, meters, centimeters, millimeters). Thus, when a foreign government sets it specs for that country's passport photos, it's measured in millimeters, not inches.
A common size for many European Passport Photos is 35x45mm. The Canadian passport photo is 50x70mm. The passport photo for India is 35x35mm and for a Greek passport photo, it's 40x60mm. These are not sizes that can accommodated by the local drug store or post office. All that most of them are capable of doing is 2x2 INCHES.
If you're a citizen of a foreign country and living in the US, you'll need to go to a professional photography studio who specializes in passport photos that can be custom sized in millimeters.
Newsome's Studio of Photography in North Tampa (Carrollwood), located at 10012 N. Dale Mabry Hwy, Suite 219, Tampa, FL 33618 (in Cypress Point Office Park, behind Starbucks, at the corner of Linebaugh and Dale Mabry Hwy) can provide you with the exact size specified by your country's passport office.
By appointment only... 813-968-2810.