The size of the photo is in inches, 1 inch =2.54cm, and usually x inches refers to the inch length of the long side of the photo. For example, 5 inches means that the photo width is 2.54x5 =12.7cm; 12 inch means that the width of the photo is 2.54x12 = 30.5cm. ..
Generally speaking, it is best not to take selfies with your digital camera. Choose white or light-colored walls (or use white or light-colored sheets) at home when shooting, and try to choose unpolarized light sources (you can turn on the flash).
You can use the desk lamp at home to assist in shooting. When shooting, the camera should be at the same level as the head of the subject, and the shooting distance should not be too close (the face may be deformed if it is too close) about 2 meters. This painting is mainly about this man's head and chest. Pay attention to the distance between the head and the upper and lower borders, and keep your eyes in a horizontal position.
ID card photos are divided into three types according to size: one inch, two inches smaller and two inches smaller. One inch and two inches are mainly used for various diplomas, resumes, etc., and two inches smaller is mainly used for passports.