Caption

A man's hand is placed flat on a wooden surface for few seconds. When the hand is removed, the surface remains warmer than surrounding and keeps the thermal imprint or shadow for some time. Thermography is a technique for visualizing the temperature of objects by recording the thermal emission at infrared wavelengths. This video was acquired with a specialized camera that is sensitive to electromagnetic radiation in the wavelength range of 8 to 14 micron. The camera produces 320x240-pixel frames where different colors correspond to different temperatures.