Cropping is done either
in horizontal or vertical direction
depending on the aspect ratio relation
between the image and the viewer.
Letterbox
Letterbox:
Displays all content within the viewer.
description
Black bars shown on both
sides of the content. Bars are shown
either below and above or to the left
and right of the content depending on
the aspect ratio relation between the
image and the viewer.
Enumeration for render mode
{number}
Modes for specifying how rendering is done in the viewer. All modes preserves the original aspect ratio of the images.