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DSP Operation
23
Gamma correction
Set LUT discretionally, or set in the proximity line a
form supplement. Regarding the discretional setting,
enter LUT value for a discretional value from 0 to 4095.
Regarding 5 points proximity line form supplement,
select a degree from among 1 to 5 for each point (256,
512, 1024, 2048, 3072) in order to set a gamma curve
easily.
In both cases, the setting values can be saved, and can be
read in when restarting.
In the gamma mode, there are 5 modes (MODE 1 to
MODE 5) other than MODE 0. MODE 1 to MODE 4 are
MANUAL modes, MODE 5 is DEFAULT mode. When
a MANUAL mode (MODE 1 to MODE 4) is selected,
the LUT value previously saved is loaded and GAMMA
command can be accepted. When the DEFAULT mode
(MODE 5) is selected, in LUT value returns to the
factory setting and GAMMA command cannot be used.
The DEFAULT mode (MODE 5) is a gamma curve to
which the output values for 5 points (256, 512, 1024,
2048 and 3072) are set to 1, 2, 3, 3 and 3 by the 5 points
proximity line form supplement.
In MODE 2 and MODE 4 (5 points proximity line form
supplement) the gamma curve may not be in sequence.
In this case, it may seem that data lacking in a point there
is no output level after the gamma process when the
video signal is displayed in the waveform or the
histogram. This is because there is actually no signal
output corresponding to the output step value. This is not
a problem.
0
256 512
2048
1024
3072
OUT
IN
4095
4095
Gamma OFF
(
γ
= 1)
γ
processed by the
line form
supplement
MODE
Action immediately after
setting
ROM save
LUT
GAMMA
command
0
OFF (
γ
= 1)
Not saved
Through (
γ
= 1)
Impossible
1
Loads previously set value
Saved
Discretional setting
Possible
2
Loads previously set value
Saved
5 points proximity line form
supplement
Possible
3
Loads previously set value
Not saved
Discretional setting
Possible
4
Loads previously set value
Not saved
5 points proximity line form
supplement
Possible
5
Resets to initial value
Saved
Factory setting
Impossible
Note