When a person wears a white shirt or blouse, the edges of the clothing can disappear into the background under bright lighting, leaving only the face visible. This gives the photo an unnatural appearance, as if the head were floating. Beyond the aesthetic issue, this blending effect can interfere with biometric scanning systems used by immigration officers and automated border control gates. These systems depend on clear, defined outlines to read and match facial features correctly. Any confusion caused by poor contrast can lead to scanning errors and, ultimately, rejection of the photo.
