132 ____________________________________________________Barco - RHDM-2301 - User manual
Addendum
Table 14: Safe area markers defined for 4:3 formats and relative to image bor-
ders
NOTE
:
The percentages define the reduction of the image on one side of the screen. The reduction takes place
at both sides of the screen and thus the total reduction is defined as twice the percentage tabulated for
both horizontal and vertical.
Overscan note:
The EBU and ITU recommendations work under different assumptions: EBU reduces the
image by 18 pixels (2.5% of 720) of a SD signal to compensate for overscan, while ITU
starts from the full 720 pixel width. The display unit always uses the full width of the
signal, even when calculating EBU standard safe area markers.
SMPTE note:
SMPTE only defines standards for safe area markers relative to image borders. The
display unit uses the percentages recommended by SMPTE for safe area markers relative
to the aspect ratio marker.
4:3 signal safe area markers note:
The standards only define safe areas for 4:3 signals for retention of the 14:9 central
zone. The display unit will place the safe area markers relative to the aspect ratio
markers as well and the same percentage is used, as if it were relative to the image
borders.
Custom aspect ratio marker note:
When a custom aspect ratio marker has been specified, the standards mentioned above
do not define the safe area and the standard selection will be locked on custom.
