Infrared, or “IR” photography, offers photographers of all abilities and budgets the opportunity to explore a new world – the world of the unseen. Why “unseen”? Because our eyes literally cannot see IR light, as it lies just beyond what is classified as the “visible” spectrum – that which human eyesight can detect. When we take photographs using infrared-equipped film or cameras, we are exposed to the world that can often look very different from that we are accustomed to seeing. Colors, textures, leaves and plants, human skin, and all other manner of objects can reflect IR light in unique and interesting ways, ones that cannot be mimicked with tools such as Photoshop (yes – there are limits to what Photoshop can do!). Like any form of photography or art however, it is a matter of taste. I would strongly urge people to explore the world of IR. As the number of cameras-equipped devices proliferates and the associated technologies improve, IR photography may offer the opportunity for photographers to expand into new arenas and differentiate their offerings from those of others.
For purposes of this article, I will refer to the infrared light spectrum as “near infrared”, or simply, “IR”. Near infrared refers to the spectrum of light just beyond the range humans can detect with their eyesight. This light range is between 700 – 1200 nm (nanometers). Another aspect of the IR spectrum, above near IR, is associated with thermal imaging. Thermal technology was popularized by movies such as, “Patriot Games” and other thrillers, whereby intelligence agencies or military personnel were able to detect villains by measuring their body heat under nighttime conditions. Today’s common digital camera sensors are not able to detect thermal images. Under the right circumstances however, digital cameras can do an excellent job of recording IR.
2) History Of Infrared Photography
The first forays into IR photography, using special film plates, began in the early part of the 20th century. During WWI, IR photography proved extremely valuable, as images using the IR spectrum were not affected as much by atmospheric haze as normal photos. IR images were also able to show stark distinctions between vegetation and buildings, better identifying potential enemy targets such as camouflaged munitions factories and other key sites. Rivers, streams, lakes, and other waterways were depicted in a very dark hue, making them much more obvious.