Apple Compressor 3 - Manual (Page 285)

There are also several common padding settings you can choose from, such as 16 x 9 and
Panavision. These make it easy to have Compressor automatically enter padding values
to ensure the source image retains its original aspect ratio.
The padding settings are in the Output Image Inset (Padding) section of the Geometry
pane.
About the Geometry Pane
You use the Geometry pane to choose cropping and sizing settings, output media file
sizes, and the aspect ratio (the ratio between image frame width and height).
Cropping
Scaling
Padding
Source Inset (Cropping) Settings
You can use the “Crop to” pop-up menu to apply a center crop or enter cropping settings
in the fields described below.
• “Crop to” pop-up menu: Choose from the following options for manual cropping or
automatic center cropping.
The actual numeric crop values are determined once a target setting is applied to a
job.
285 Chapter 24 Adding Geometry Settings