Crystal Vision
Aspect Ratio Correction
bars to the top and bottom of the picture. 14:9 Letterbox will crop the picture to 87.5%, and
depending on the aspect ratio of the display will either add black bars to the top and bottom or
to both sides of the picture. There will be some loss of picture. Pillarbox will compress the
picture to the centre part of the screen and add black bars to both sides. There may be a
minimal picture loss depending on the selected video format. ‘Stretch’ is a specialist ratio
requested by a major broadcaster to correct an input image that has been previously
incorrectly aspect ratio corrected resulting in a vertically ‘stretched’ picture. Similarly, the
aspect ratio corrections listed below for HD 4:3 inputs are specialist in nature, and unlikely to
be encountered.
The table below lists all available fixed ARC ratios:
SD to HD
HD to SD
SD to SD
HD to HD
Anamorphic
Anamorphic
Anamorphic
Anamorphic
4:3 to 16:9 with Full
Screen 16:9
4:3 to 16:9 with Full
Screen 16:9
4:3 to 16:9 with Full
Screen 16:9
4:3 to 16:9 with
Full Screen 16:9
4:3 to 16:9 with 14:9
Pillarbox
4:3 to 16:9 with 14:9
Pillarbox
4:3 to 16:9 with 14:9
Pillarbox
4:3 to 16:9 with
14:9 Pillarbox
4:3 to 16:9 with 4:3
Pillarbox
4:3 to 16:9 with 4:3
Pillarbox
4:3 to 16:9 with 4:3
Pillarbox
4:3 to 16:9 with
4:3 Pillarbox
16:9 Stretch to Full
Screen 16:9
16:9 to 4:3 with Full
Screen 4:3
16:9 to 4:3 with Full
Screen 4:3
16:9 stretch to
Full Screen 16:9
16:9 Stretch to 14:9
Letterbox
16:9 to 4:3 with 14:9
Letterbox
16:9 to 4:3 with14:9
Letterbox
16:9 stretch to
14:9 Letterbox
16:9 Stretch to 16:9
Letterbox
16:9 to 4:3 with 16:9
Letterbox
16:9 to 4:3 with16:9
Letterbox
16:9 stretch to
16:9 Letterbox
Note
: The boxes shaded grey are the only fixed aspect ratio corrections offered by the UP-
DOWN-A-VF and UP-DOWN-AS-VF
Anamorphic
All format conversions are capable of anamorphic aspect ratio correction which maps the
image as though the ARC had been bypassed. Of course, the up/down conversion process
may involve aspect ratio correction as the number and shape of pixels changes between
formats (when converting from SD to 1080i, for example) but the image when viewed on the
target display will appear distorted as if no aspect ratio correction was present.
UP-DOWN-VF User Manual R1.1
45
23 June 2017