What's the gray background photo for?

Companies generally use blue and white background photos. Special units will use a red background, and some external occasions will also use a gray background.

Difference of background color of ID photo:

1, white background: used for passports, visas, driver's licenses, ID cards, second-generation ID cards, driver's licenses, black and white documents, medical insurance cards, Hong Kong and Macao passes and passports;

2. Blue background: used for graduation certificate, work permit and resume;

3. Red background: used for insurance, medical insurance, IC cards, temporary residence permits and wedding photos;

4. ID card photos are photos used to prove identity on various documents. The ID photo requires a bareheaded (bareheaded) front photo, in which the outline of a person's ear and the place equivalent to a man's Adam's apple should be seen normally.