Passport photos for countries other than the US are measured in millimeters. The drug stores and travel club either can't or won't be able to provide that, because it requires continuous updated knowledge of each country's size and background requirements which are known to change unexpectedly.
The US is still on the Imperial Measurement System, meaning they use inches, feet, yards, miles, etc. The rest of the planet is on the Metric System, meaning they use millimeters, meters, kilometers, etc.
As an example, the UK (Great Britain) requires their passport photos to be 35x45mm with a light gray background. Australian passport photos are also 35x45mm, but on a white background and must be printed at a minimum of 450ppi resolution. A Chinese passport photos is 33x48mm while a Greek passport photo is 40x60mm and Canada's is 50x70mm.
These differences make it very difficult for anyone other than an experienced, full-time, professional photographer like Newsome's Studio of Photography, to stay up to date and provide a quality passport photo that is sure to pass the discerning eye of a foreign country's passport office.
Newsome's Studio is on the "preferred photographer list" kept by the consulates of several foreign countries. Get it right the first time and contact Newsome's for a ten minute appointment and rest easy that your photos won't be rejected.
By appointment only... 813-968-2810