iChat was supposed to have a Star Wars hologram effect in Leopard, however, this was missing as it didn’t make it to the final cut. A mod has been made to create this effect in iChat. To get it to work you need to copy the install file over on to your computer by following the instructions below. Good luck and let us know how it works for you if you are a Leopard user.
You simply copy the .qtz file into your {HardDriveName}/Library/Compositions/ directory. The new effect will appear in iChat and can be seen by anyone (they don’t have to install the effect). An early version of the effect is available in this thread.
Update: Ice-Cube posts how to get this effect into PhotoBooth:
1. Extract HoloGit.qtz from the zip file.
2. Place it on your desktop for easy access.
3. Go to photobooth in your applications folder and right click to *Show package contents*
4. Navigate to content>resources
5. Drag the HoloGit.qtz file from the desktop to this folder.
6. Locate the file *EffectsOrdering.plist* in this folder
7. Open the file with textedit
8. You should see a number of effects listed in that file. You should see user backdrop 1, user backdrop 2, and so forth in the last paragraph.
9. Replace the words *user backdrop 1* to *HoloGit*
It should look like this: /HoloGit
10. Save the file. Close all folders.
11. Open up photobooth and enjoy your newfound effect.
Via: MacRumors
this wont mess up my compuiter if i do it wrong right