I’m not familiar with the terminology you’re using as it relates to After Effects, but my guess is that you’re talking about scaling and moving your image. The easiest way I can think of to do this would be to place the anchor point on the right edge of your layer, disabling constrain proportions on the scale property and scaling on the X-axis only.
If your layer is 720 x 480 pixels then set your anchor point and position to [720, 240]. Then reveal your scale property, click the chain link icon to disable constrain to proportions and animate the X value of the scale down.
Darby Edelen
Lead Designer
Left Coast Digital
Santa Cruz, CA