You glow ........but not a lot. It is possible to build infrared detectors to photograph your glow but it can't be done with film, because the film would go black in the camera by itself. The usual way is to build semiconductor arrays which work better if cooled with liquid air. Enhancing a raw low contrast image with special Adobe-type software gives quite remarkable results.
Click to enhance
Black-body Radiation
A black-body is not exactly black. They can be bright like the sun ............ it all depends on how hot they are.
A black-body is both an ideal absorber and radiator of energy. The ones I like best are the Thai clay-ball fireworks. Look inside when the sparks have finished roaring out the hole. The cavity is coated inside with a fresh layer of soot. If light or heat waves go in the hole they bounce around inside and get absorbed. The orange glow you see is the reverse. The walls of the cavity emit radiation which is absorbed and reradiated until some escapes out the little hole.
Radiation of this type has a particular continuous spectrum. The usual example is a cavity radiator at the surface temperature of the Sun (6000 K).
The Graph shows intensity versus wavelength. The curve can be scaled for intensity to fit any size of source and scaled for wavelength to fit a source of any temperature.
The peak for sunlight is in the visible region (it has to be!). There is a 'cut off' in the UV and a long upper tail in the infrared. The peak wavelength is given by a simple formula known as Wein's law.
The output of the Sun (or any other star) is close to, but not exactly, black body. The peak of the solar output with a surface temperature of 6000 K is at 4.8 nm in the green. A red star is cooler (3-4000 K) and a blue/white star is hotter (15-25000 K).
The outer solar corona has a temperature of 2 000 000 K. Black-body emission at this temperature is in the soft x-ray region.
Persons are not so hot. At a little over 300 K the peak is in the infrared.
The military have been taking infrared photographs for years. The stuff is slowly getting in to the consumer market. Sony had a digital camera that worked just fine at room temperature but the results were ........ a little too revealing ........and they had to pull it.
Question ...... persons are not so hot .....what about really cold things?
If we could detect the heat radiation from a bowl of liquid helium at 4 K where would the peak be? There is not much radiation but if there is any at all, the clever people at NASA are able to detect it. The question is a good one with an answer. The tiny amount of radiation coming from our bowl of liquid helium peaks in the microwave region! That is not so bad because microwaves are not that hard to detect - the TV and telephone people do it all the time.