Infrared Photography was first achieved using special film that captured light wavelengths that are just outside the visible spectrum.
This creates a very eerie image and when used with a Landscape image produces an effect where skies are black and grass and other green items glow white.
In portraiture, the skin tones are light and almost angelic like and the eyes are jet black.
I like to use the infrared photography effect with some of my urban images too, especially where there is a lot of sky or very strong bold lines.
Although Photoshop cannot produce an exact copy of an infrared image taken using special film it can be used to create a very similar effect.
For this example I have chosen two very different urban images to illustrate the infrared effect.
The first image has both a lot of sky and also some strong lines of the cranes that will add to the eerie effect. The second image has little actual sky but a lot of sky reflection and lots of bold strong dark lines.
If your image has lots of green in it:
If your image has little green in it:
When you have achieved the desired effect Press OK
Now its time to apply a little glow to the image to add to the ghostly feel.
As you can see in the final images, the infrared effect has created very different images from the originals. Although not often an effect used in urban photography I like to use it from time to time just to add impact and atmosphere.