Terminology - Barco RHDM-1701 User Manual

Terminology

6 Terminology
The terminology used throughout the manual is described in detail in this chapter. More information
related to the operation and settings of the display unit can be found and is in most cases extended
with background information that can be relevant for the user to understand the capabilities of the
display unit.
Aliasing
Aliasing of a displayed image occurs when frequencies higher than half of the sample frequency are
used in the image (Nyquist theorem).
Background
The background setting is similar to the brightness setting on a CRT display unit. Background
adjusts the black level of the display unit. Setting the background too low, information in the dark
parts of the image is lost and possible information in the headroom of the video signal can become
visible. Setting the background too high will lead to the whole image resting on a grey pedestal and
the bright levels being clipped. The dark levels becoming visible in the foot room of the video
signal. The value of the background control is expressed in number of bits. The actual light output
at the 100% drive level depends on the setting of the picture control. The value of the background
is equivalent to video offset and is expressed in 8-bit steps.
100 %
Visualize
Black
super dark
offset
Black
0 %
clipping
dark levels
Figure 57: Background control
162 Barco - RHDM-1701 - User manual
clipping
bright levels
+
Visualize
super bright
-
White
Video signal
100 %