True infrared photography involves either having a special camera or (permanently) modifying an existing one to filter out the normally visible parts of the light spectrum and allow only infrared light wavelengths.
The result is what you see below (although many of these have been adjusted to feature added-in colours):
This technique is mostly used in landscape photography (not for photos of people), and makes green elements appear snowy or white. Other hallmarks are a dark-to-bright gradient in clear skies.
Take a minute and do a full Google Images search for "Infrared photography". You'll see many more examples that the screenshot above.
While we don't have the expensive gear necessary to take true infrared images, we can imitate the effect in Photoshop.
No Photoshop tutorial is going to truly replicate the infrared effect, but here are two options:
1) Follow THIS LINK for one method.
Correction/Update: In the current version of Photoshop, the Texture > Grain filter can be found by going to Filter > Filter Gallery > Texture > Grain.
2) Watch the video below for a second, more detailed method. (Pay close attention...he goes fast!)
INFRARED PHOTOSHOP ASSIGNMENT
Your goal is to submit TWO edited images (each paired with its "before" version). One of them can be an existing image from your collection, or from the Internet.
IR Photography is best used for landscapes (not people), so stick to trees and possible structures. This must be done outside.
Be sure to look at lots of examples to help give you ideas.