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Reference Manual ATOM one SSM500
int lb = (int) round( linear_brightness * 1000.0f );
// lb = 0
int c = (int) round( contrast * 1000.0f );
// c = 1099
int g = (int) round( linear_contrast * 1000.0f );
// g = 450
int b = (int) round( brightness * 1000.0f );
// b = -99
Example curve for REC.709:
=> lut_gamma 18 4500 0 1099 450 -99
OK
13.18
lut_fast_gamma <gamma>
The fast gamma function uses the same formula as the
lut_fun_rec709
command, but the
user only has to specify the desired gamma value. All other values are fixed or computed
as needed.
Value
Minimal
Maximal
REC.709
Gamma
1100
3000
2222
Note: The value is normalized to a range from 0.0 to 1.0 and multiplied by a scaling
coefficient of 1000. Setting a value of 2222 will result in the default REC.709 gamma
curve.
13.19
lut_fixed_mode <mode>
The fixed gamma mode allows to choose between three fixed gamma tables which are
shown in the table below.
Mode
Description
0 (default)
REC.709
gamma curve.
1
PQ
gamma curve specified in ITU-R BT.2100 which can be used for HDR
content. This will use the PQ curve with a maximum brightness of 10000
cd/m
2
which results in the full SDI code range being used. If you need
other values, use the
log_mode
and
pq_max_brightness
command
instead.
2
HLG
gamma curve specified in ITU-R BT.2100 which can be used for HDR
content.
3
S-Log3
gamma curve specified by Sony which can be used for HDR
content. This will use the S-Log3 curve with a master gain of 10 dB which
results in the full SDI code range being used. If you need other values use
the
log_mode
and
slog3_master_gain
commands instead.
