Most likely, they are mostly images taken with digital cameras and camcorders, not classic material halogen silver. Possible explanation that on the picture is exposed also a part of the infrared spectrum, that the human eye does not perceive.
Malamang, Sila ay halos imaheng Kinuha na may mga digital camera at Camcorder, hindi klasikong materyal halogen pilak. Na posibleng paliwanag sa larawan na may nakalantad din at bahagi ng infrared spectrum, Na ang mata ng tao ay hindi malasahan.