Game Development Reference
Figure 11.7 The results after
applying the Simple Choker effect.
I've heard it suggested that the Simple Choker effect can also
compensate for an incorrect alpha interpretation. For example, if
an object you import has a premultiplied alpha channel, and you
import it as straight, it will have a halo around it. The suggestion
was to remove the halo with the Simple Choker effect. However,
I don't recommend this course of action. You will almost always
get much better results from interpreting the alpha channel cor-
rectly in the Interpret Footage dialog box (which now has a nifty
shortcut button in the bottom left-hand corner of the Project
panel in After Effects CS4), rather than by using effects to “inter-
pret” the alpha.