From VFXPedia

Letterbox [Lbx]
	Use the Letterbox Tool to adapt existing images to the frame size and aspect ratios of any other format. The most common use of this tool is to adapt film resolution images to NTSC or PAL sized frames for viewing on an external television monitor. Horizontal or vertical black edges are automatically added where necessary to compensate for aspect ratio differences.

Contents 1 Letterbox [Lbx] 1.1 Controls Tab 1.2 Tips for Letterbox (edit)

Controls Tab

Place the pointer on the Aspect X or Y control and press the right mouse button to display a menu with available frame formats. Select any one of the choices from the menu to set the Height, Width and Aspect controls automatically, or enter the required information manually.

The values of these controls determine the size of the output image as measured in pixels.

The controls determine the Pixel Aspect Ratio of the output image.

This center control repositions the image window when used in conjunction with Pan-And-Scan mode. It has no effect on the image when the tool is set to Letterbox mode.

This control is used to determine the Letterbox tool's mode of operation.

This corrects the aspect of the input image and resizes it to match the specified width.

This corrects the aspect of the input image and resizes it to match the specified height. If the resized input image is wider than the specified width, the center control can be used to animate the visible portion of the resized input.

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Tips for Letterbox (edit)

EyeonTips:Manual/Tool Reference/Transform/Letterbox