Fabulous Plants doesn't give a fuck, because Fabulous Plants are too busy being fabulous
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False-color infrared photography is done using a modified camera which has the built-in filter removed and replaced, allowing the sensor to record in its full range of sensitivity. Since cameras are only made to photograph red, green, and blue light, the infrared light has no specific color it should be in the camera. Instead, the infrared is unevenly mixed into those 3 colors, which creates a colored impression of infrared light, hence being called ‘false-color.’ By exploiting this characteristic of digital cameras, one can greatly influence the way infrared light should appear, whether blue, green, pink, or yellow, some of the most common colors for infrared in this type of photography.
What is UVIVF photography?
Ultraviolet-Induced Visible Fluorescence (UVIVF) is a process in which given wavelengths of ultraviolet radiation are absorbed by a material’s molecules, causing them to achieve an excited state. Through this, fluorescent materials reach an unstable excited state and lose small amounts of energy through other mechanisms until they can drop to a suitable ground state by releasing a photon of a specific energy and wavelength. Since energy was lost before the remainder was released as a photon, the wavelength of that photon is longer than the stimulating source, which means an ultraviolet light is able to produce dramatic visible fluorescence.
This phenomenon is commonplace enough that everyone has likely seen it in some fashion. The way a white T-shirt glows blue under a blacklight, the way a piece of printer paper gets bright in the sun, and even fluorescent light bulbs all result from the same process. The main difference is the subject and intensity of the ultraviolet light source.
Though a camera can see some ultraviolet, a normal camera has a built-in filter which blocks the great majority of infrared and ultraviolet light. By using a light source with a wavelength shorter than 400nm, one can eliminate most of the ultraviolet, allowing just the fluorescent light to create an image. This means that all the light in the photograph is originating from within the subject itself!
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Before digital you could buy infrared film, but it was all monochromatic.
UV photography is a bit more challenging and the best lenses for it are made from quartz and are outrageously expensive.
In that photo, how are the visible colors determined? I'm guessing you have software that converts various parts of the IR spectrum to some arrangement of visible colors, and that perhaps could be adjusted by you.
With the tree leaves showing as white, does that mean their emissivity is near 1.0?
While I was working in industry, we once tried to measure IR radiated from hot process buildings - thinking we could sell that as a service to determine where heat losses were high, perhaps indicating damaged rock wool insulation. Turned out to be a flop because all the buildings were clad with bare aluminum lagging which has virtually zero emissivity!
Thanks Major Nikon, nice photo.......
(Nikon F owner here....showing my age)
I don’t usually duplicate the shot with a standard camera. For me false color IR is just that. I’m trying to create an image that diverges from what is optically visible. Part of the fun is discovering what you have captured much later during processing, something like the old film days.
