Blackmagic Design Desktop Video Manuel D'installation Et D'utilisation page 25

To set your up or down conversion settings, select your input or output
conversion from the respective dropdown menu, and click on the desired
aspect ratio selection. Remember to click 'save' to apply your settings.
The following table outlines the different aspect ratio selections available during conversions.
Down Source
Conversion Image
Letterbox
Anamorphic
Center Cut
Pillarbox
16:9 Zoom
14:9 Zoom
Converted
Image
Scales the entire 16:9 HD image into a
4:3 SD frame leaving black bars on the
top and bottom.
Horizontally squeezes the 16:9 HD image
into a 4:3 SD frame.
This setting cuts a 4:3 SD frame from the
16:9 HD image. This aspect ratio setting
discards a portion from each side of the
16:9 image.
Displays a 4:3 SD image inside an
16:9 HD frame. Black bars feature
on the sides.
Scales the 4:3 SD image to fill
the 16:9 HD frame.
A compromise between Pillarbox and
16:9 Zoom. Minimal black bars with slight
crop top and bottom.
Blackmagic Desktop Video Setup 25