Table of Contents
Advertisement
4095
γ processed by linear
interpolation
OUT
0
256 512 1024
6.7.3.
Coefficient input method
You can use Modes 6 and 7 of GAMMA-MODE to
create your own gamma curve by setting the γ
coefficient and offset value.
If the level of the input image is IN (12-bit conversion)
and the coefficient is γ, the level OUT (12-bit
conversion) of the output image is expressed by the
following equation.
The setting range available for the γ coefficient is 0.00 to
1.00.
Setting an offset allows for γ = 1 to be set for the level on
and below the offset, and allows you to prevent white
appearing in black parts.
For example, if you set the offset value to 300, the curve
will be that of γ = 1 for an input image level of 300 and
below, and the curve will be that of the configured γ
value for an input image level over 300. The gamma
curve for all input levels is depicted in the solid line of
the graph, and this curve is used to determine the OUT
level of the output image corresponding to an IN level of
a particular input image.
4095
γ curve
OUT
0
300
Offset
32
6. DSP Operation
Gamma off
(γ = 1)
2048
3072
4095
IN
Gamma off
(γ = 1)
4095
IN
x Example of gamma command
Set the gamma mode to 1, and set level 500 to 300 and
save it.
> GAMMA-MODE 1
OK
> GAMMA 500 300
OK
Set the gamma mode to 4, then set the point "512" to
level 3 and check the picture. The setting is not saved
here. After that, set the gamma mode to 2, and save it.
> GAMMA-MODE 4
OK
> GAMMA 512 3 (Check the picture. The setting is not
saved.)
OK
> GAMMA-MODE 2
OK
> GAMMA 512 3 (The setting is saved.)
OK
Set the gamma mode to 2. You cannot set a value other
than 5 points ("256", "512", "1024", "2048", "3072").
500 is not correct in the following.
> GAMMA-MODE 2
OK
> GAMMA 500 300
ERROR SYNTAX
OK
Turn off the gamma mode. You cannot input the
GAMMA command here.
> GAMMA-MODE 0 (Gamma mode off)
OK
> GAMMA 512 1
ERROR STATUS
Create a gamma curve by setting the gamma mode to 6,
setting the offset to 300, and setting the γ coefficient to
0.45, and then save it.
> GAMMA-MODE 6
OK
> GAMMA 0.45 300
OK
Advertisement
Table of Contents
