C*Pix SDC2000 Provozní pokyny Strana 126

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SDC 2002
4.3. TK Config Menu
4-40
Operating Instructions - Rev. 1 / 6.2003
”GRLEV” Image data is mapped to graphic video levels
black level 0
d
white level 1019
d
(10
bit)
within a total range of 0 - 1023
d
(10
bit)
Characteristics:
0
d
1024
d
1024
d
Note!
The CRT gamma is normally switched on
- main menu “Color”, submenu “Col Set”
- but may be switched off for pure linear video signals.
data output-code value
Lookuptable input
GR-LEV (CRT on)
GR-LEV (CRT off)
Description
GRLEV
Graphics level behaves the same way as TV level, the only difference is the data
mapping within the 10-bit range Looking at the output test point, 0% signal will be
mapped to 0
d
, 100% to 1019d. There is no headroom for signal portions above
100%.
In the past, traditional graphics workstations for print media (i.e. desktop publish-
ing) usually worked in graphics level, they did not spend bits for headroom, which
originates out of the video domain.
Only video oriented applications reserve some code values to provide headroom
within their 8 or 10-bit environment to ensure that no picture information is clipped.
Attention!
Many applications can handle TV level and Graphics level data separately, there-
fore it is important to switch the application to the right mode in order to receive
the data appropriately.
If you are working in the wrong way at this point, you will compress the data or cut
off high and low lights.
The compression can be handled by the downstream application in most cases
by setting the data to a higher contrast, but is not recommended for quality rea-
sons.
Note!
The cutoff of information (data from telecine in graphics level, downstream ap-
plication in TV level mode) cannot be restored.
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