Quantum-data 801GC Manual do Utilizador Página 173

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6-47
Set the GAMC parameter to 1 to enable gamma cor-
rection or 0 to disable gamma correction. When
gamma correction is enabled, the value indicated
by the parameter GAMA is used. The FMTN value
of 2.2 is standard for North American television.
European television standards commonly specify a
value of 2.8.
Next, determine how the display receives horizon-
tal and vertical synchronizing information. Some
displays have one or two separate TTL digital sync
inputs. Other displays require composite sync on
the bottom of the analog video signal. Some multi-
mode displays accept multiple types of sync.
If the display only requires separate digital sync in-
puts, you can leave the remaining analog video and
sync parameters at their default FMTN settings and
go on to the section on “Digital Sync Parameters.”
This will prevent composite sync from ever appear-
ing on the analog video outputs.
3.0
.25
0 63 127 191 255
0
63
127
191
255
1.0
Video Level
Before Gamma Correction
Output
Level
After
Gamma
Correction
0.5
2.0
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