White background photos are used for ID cards, passports, visas, driver's licenses, second-generation ID cards, driver's licenses, black-and-white documents, medical insurance cards, Hong Kong and Macao passes, etc. Blue background: used for graduation certificate, work permit, resume, etc. Both white and blue can be used as award certificates, and different regions need different background colors.

Photographs with different background colors correspond to documents with different purposes. You need to find the corresponding background color when taking pictures.