This image is from the Infrared Processing and Anaysis Center at California Institute of Technology. The caption was prepared with the help of Dr. Charles Beichman, Project Scientist, IRAS Project and the caption is quoted from a slide set produced and distributed by the Astronomical Society of the Pacific.
This is an infrared image of a Jet Propulsion Lab engineer holding a burning match. The image is color-coded to show differences in temperature: note the white and deep red in the flame and the engineers palm (where his warm blood vessels are close to the surface of the skin) and the blue of his cool glasses. This picture demonstrates that infrared images predominantly show heat energy and its distribution..